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Liu L, Zhang Y, Tang C, Wu J, Fu J, Wang Q. Genome-wide identification of ZmMYC2 binding sites and target genes in maize. BMC Genomics 2024; 25:397. [PMID: 38654166 PMCID: PMC11036654 DOI: 10.1186/s12864-024-10297-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 04/09/2024] [Indexed: 04/25/2024] Open
Abstract
BACKGROUND Jasmonate (JA) is the important phytohormone to regulate plant growth and adaption to stress signals. MYC2, an bHLH transcription factor, is the master regulator of JA signaling. Although MYC2 in maize has been identified, its function remains to be clarified. RESULTS To understand the function and regulatory mechanism of MYC2 in maize, the joint analysis of DAP-seq and RNA-seq is conducted to identify the binding sites and target genes of ZmMYC2. A total of 3183 genes are detected both in DAP-seq and RNA-seq data, potentially as the directly regulating genes of ZmMYC2. These genes are involved in various biological processes including plant growth and stress response. Besides the classic cis-elements like the G-box and E-box that are bound by MYC2, some new motifs are also revealed to be recognized by ZmMYC2, such as nGCATGCAnn, AAAAAAAA, CACGTGCGTGCG. The binding sites of many ZmMYC2 regulating genes are identified by IGV-sRNA. CONCLUSIONS All together, abundant target genes of ZmMYC2 are characterized with their binding sites, providing the basis to construct the regulatory network of ZmMYC2 and better understanding for JA signaling in maize.
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Affiliation(s)
- Lijun Liu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, College of Agronomy, Sichuan Agricultural University, 611130, Chengdu, China
- College of Life Science, Sichuan Agricultural University, 625014, Yaan, China
| | - Yuhan Zhang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, College of Agronomy, Sichuan Agricultural University, 611130, Chengdu, China
| | - Chen Tang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, College of Agronomy, Sichuan Agricultural University, 611130, Chengdu, China
| | - Jine Wu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, College of Agronomy, Sichuan Agricultural University, 611130, Chengdu, China
| | - Jingye Fu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, College of Agronomy, Sichuan Agricultural University, 611130, Chengdu, China.
| | - Qiang Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, College of Agronomy, Sichuan Agricultural University, 611130, Chengdu, China.
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Zhang L, Duan Z, Ma S, Sun S, Sun M, Xiao Y, Ni N, Irfan M, Chen L, Sun Y. SlMYB7, an AtMYB4-Like R2R3-MYB Transcription Factor, Inhibits Anthocyanin Accumulation in Solanum lycopersicum Fruits. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:18758-18768. [PMID: 38012529 DOI: 10.1021/acs.jafc.3c05185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Tomato is a horticultural crop with an incomplete flavonoid metabolic pathway that does not typically accumulate anthocyanins in the fruit. In recent years, intensive studies of the loci Anthocyanin fruit (Aft) and atroviolacium (atv) have clarified the functions of positive regulators (R2R3-MYBs) and a negative regulator (CPC-MYB) in anthocyanin biosynthesis in the fruits. However, little is known about the R2R3-MYB repressors. Here, we used transient overexpression analysis to show that SlMYB7, a subgroup 4 AtMYB4-like R2R3-MYB, inhibited anthocyanin accumulation and reduced expression of anthocyanin synthase genes in the 'black pearl' tomato fruits, which usually accumulate high concentrations of anthocyanins. These findings revealed that SlMYB7 served as a repressor of anthocyanin production. Furthermore, SlMYB7 actively repressed SlANS expression by binding its promoter and passively inhibited anthocyanin synthesis by interacting with the basic helix-loop-helix (bHLH) proteins SlJAF13 and SlAN1, which are involved in the formation of MBW complexes. Thus, SlMYB7 and the MBW complex may coregulate the anthocyanin content of 'black pearl' tomato fruits via a negative feedback loop. These findings provide a theoretical basis for the future enhancement of tomato anthocyanin contents through genetic manipulation of the biosynthetic regulatory network.
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Affiliation(s)
- Li Zhang
- Key Laboratory of Agriculture Biotechnology, Key Laboratory of Protected Horticulture (Ministry of Education), College of Biosciences and Biotechnology, Shenyang Agricultural University, Liaoning 110161, China
| | - Zedi Duan
- Key Laboratory of Agriculture Biotechnology, Key Laboratory of Protected Horticulture (Ministry of Education), College of Biosciences and Biotechnology, Shenyang Agricultural University, Liaoning 110161, China
| | - Shuang Ma
- Key Laboratory of Agriculture Biotechnology, Key Laboratory of Protected Horticulture (Ministry of Education), College of Biosciences and Biotechnology, Shenyang Agricultural University, Liaoning 110161, China
- College of Life Engineering, Shenyang Institute of Technology, Liaoning 110866, China
| | - Shaokun Sun
- Institute of Vegetable Research, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China
| | - Minghui Sun
- Key Laboratory of Agriculture Biotechnology, Key Laboratory of Protected Horticulture (Ministry of Education), College of Biosciences and Biotechnology, Shenyang Agricultural University, Liaoning 110161, China
| | - Yunhong Xiao
- Key Laboratory of Agriculture Biotechnology, Key Laboratory of Protected Horticulture (Ministry of Education), College of Biosciences and Biotechnology, Shenyang Agricultural University, Liaoning 110161, China
| | - Na Ni
- Key Laboratory of Agriculture Biotechnology, Key Laboratory of Protected Horticulture (Ministry of Education), College of Biosciences and Biotechnology, Shenyang Agricultural University, Liaoning 110161, China
| | - Muhammad Irfan
- Department of Biotechnology, University of Sargodha, Sargodha 40100, Pakistan
| | - Lijing Chen
- Key Laboratory of Agriculture Biotechnology, Key Laboratory of Protected Horticulture (Ministry of Education), College of Biosciences and Biotechnology, Shenyang Agricultural University, Liaoning 110161, China
| | - Yibo Sun
- Key Laboratory of Agriculture Biotechnology, Key Laboratory of Protected Horticulture (Ministry of Education), College of Biosciences and Biotechnology, Shenyang Agricultural University, Liaoning 110161, China
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Luo D, Mei D, Wei W, Liu J. Identification and Phylogenetic Analysis of the R2R3-MYB Subfamily in Brassica napus. PLANTS (BASEL, SWITZERLAND) 2023; 12:plants12040886. [PMID: 36840234 PMCID: PMC9962269 DOI: 10.3390/plants12040886] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 02/09/2023] [Accepted: 02/10/2023] [Indexed: 05/22/2023]
Abstract
The R2R3-MYB sub-family proteins are composed of most members of MYB (v-Myb avian myeloblastosis viral oncogene homolog) protein, a plant-specific transcription factor (TF) that is classified into four classes depending on the number of MYB repeats. R2R3-MYB TFs are involved in physiological and biochemical processes. However, the functions of the Brassica napus R2R3-MYB genes are still mainly unknown. In this study, 35 Brassica napus MYB (BnaMYB) genes were screened in the genome of Brassica napus, and details about their physical and chemical characteristics, evolutionary relationships, chromosome locations, gene structures, three-dimensional protein structures, cis-acting promoter elements, and gene duplications were uncovered. The BnaMYB genes have undergone segmental duplications and positive selection pressure, according to evolutionary studies. The same subfamilies have similar intron-exon patterns and motifs, according to the genes' structure and conserved motifs. Additionally, through cis-element analysis, many drought-responsive and other stress-responsive cis-elements have been found in the promoter regions of the BnaMYB genes. The expression of the BnaMYB gene displays a variety of tissue-specific patterns. Ten lignin-related genes were chosen for drought treatment. Our research screened four genes that showed significant upregulation under drought stress, and thus may be important drought-responsive genes. The findings lay a new foundation for understanding the complex mechanisms of BnaMYB in multiple developmental stages and pathways related to drought stress in rapeseed.
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Affiliation(s)
- Dingfan Luo
- College of Agriculture, Yangtze University, Jingzhou 434023, China
- Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, No. 2 Xudong 2nd Rd., Wuhan 430062, China
| | - Desheng Mei
- Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, No. 2 Xudong 2nd Rd., Wuhan 430062, China
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan 430062, China
| | - Wenliang Wei
- College of Agriculture, Yangtze University, Jingzhou 434023, China
- Correspondence: (W.W.); (J.L.)
| | - Jia Liu
- Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, No. 2 Xudong 2nd Rd., Wuhan 430062, China
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan 430062, China
- Correspondence: (W.W.); (J.L.)
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Ling LJ, Wang M, Pan CQ, Tang DB, Yuan E, Zhang YY, Chen JG, Peng DY, Yin ZP. Investigating the induction of polyphenol biosynthesis in the cultured Cycolocarya paliurus cells and the stimulatory mechanism of co-induction with 5-aminolevulinic acid and salicylic acid. Front Bioeng Biotechnol 2023; 11:1150842. [PMID: 36970633 PMCID: PMC10034720 DOI: 10.3389/fbioe.2023.1150842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 02/22/2023] [Indexed: 03/29/2023] Open
Abstract
Background: Plant cell culture technology is a potential way to produce polyphenols, however, this way is still trapped in the dilemma of low content and yield. Elicitation is regarded as one of the most effective ways to improve the output of the secondary metabolites, and therefore has attracted extensive attention. Methods: Five elicitors including 5-aminolevulinic acid (5-ALA), salicylic acid (SA), methyl jasmonate (MeJA), sodium nitroprusside (SNP) and Rhizopus Oryzae Elicitor (ROE) were used to improve the content and yield of polyphenols in the cultured Cyclocarya paliurus (C. paliurus) cells, and a co-induction technology of 5-ALA and SA was developed as a result. Meanwhile, the integrated analysis of transcriptome and metabolome was adopted to interpret the stimulation mechanism of co-induction with 5-ALA and SA. Results: Under the co-induction of 50 μM 5-ALA and SA, the content and yield of total polyphenols of the cultured cells reached 8.0 mg/g and 147.12 mg/L, respectively. The yields of cyanidin-3-O-galactoside, procyanidin B1 and catechin reached 28.83, 4.33 and 2.88 times that of the control group, respectively. It was found that expressions of TFs such as CpERF105, CpMYB10 and CpWRKY28 increased significantly, while CpMYB44 and CpTGA2 decreased. These great changes might further make the expression of CpF3'H (flavonoid 3'-monooxygenase), CpFLS (flavonol synthase), CpLAR (leucoanthocyanidin reductase), CpANS (anthocyanidin synthase) and Cp4CL (4-coumarate coenzyme A ligase) increase while CpANR (anthocyanidin reductase) and CpF3'5'H (flavonoid 3', 5'-hydroxylase) reduce, ultimately enhancing the polyphenols accumulation Conclusion: The co-induction of 5-ALA and SA can significantly promote polyphenol biosynthesis in the cultured C. paliurus cells by regulating the expression of key transcription factors and structural genes associated with polyphenol synthesis, and thus has a promising application.
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Affiliation(s)
- Li-Juan Ling
- Jiangxi Key Laboratory of Natural Products and Functional Foods, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, China
| | - Meng Wang
- Jiangxi Key Laboratory of Natural Products and Functional Foods, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, China
| | - Chuan-Qing Pan
- Jiangxi Key Laboratory of Natural Products and Functional Foods, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, China
| | - Dao-Bang Tang
- Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou, China
| | - En Yuan
- College of Pharmacy, Jiangxi University of Traditional Chinese Medicine, Nanchang, China
| | - Yuan-Yuan Zhang
- Jiangxi Key Laboratory of Natural Products and Functional Foods, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, China
| | - Ji-Guang Chen
- Jiangxi Key Laboratory of Natural Products and Functional Foods, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, China
| | - Da-Yong Peng
- Jiangxi Key Laboratory of Natural Products and Functional Foods, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, China
- *Correspondence: Da-Yong Peng, ; Zhong-Ping Yin,
| | - Zhong-Ping Yin
- Jiangxi Key Laboratory of Natural Products and Functional Foods, College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, China
- *Correspondence: Da-Yong Peng, ; Zhong-Ping Yin,
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Shi L, Chen Y, Hong J, Shen G, Schreiber L, Cohen H, Zhang D, Aharoni A, Shi J. AtMYB31 is a wax regulator associated with reproductive development in Arabidopsis. PLANTA 2022; 256:28. [PMID: 35781548 DOI: 10.1007/s00425-022-03945-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 06/15/2022] [Indexed: 06/15/2023]
Abstract
AtMYB31, a R2R3-MYB transcription factor that modulates wax biosynthesis in reproductive tissues, is involved in seed development in Arabidopsis. R2R3-MYB transcription factors play important roles in plant development; yet, the exact role of each of them remains to be resolved. Here we report that the Arabidopsis AtMYB31 is required for wax biosynthesis in epidermis of reproductive tissues, and is involved in seed development. AtMYB31 was ubiquitously expressed in both vegetative and reproductive tissues with higher expression levels in siliques and seeds, while AtMYB31 was localized to the nucleus and cytoplasm. Loss of function of AtMYB31 reduced wax accumulation in the epidermis of silique and flower tissues, disrupted seed coat epidermal wall development and mucilage production, altered seed proanthocyanidin and polyester content. AtMYB31 could direct activate expressions of several wax biosynthetic target genes. Altogether, AtMYB31, a R2R3-MYB transcription factor, regulates seed development in Arabidopsis.
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Affiliation(s)
- Lei Shi
- Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Yuqin Chen
- Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jun Hong
- Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Gaodian Shen
- Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Lukas Schreiber
- Institute of Cellular and Molecular Botany, University of Bonn, 53115, Bonn, Germany
| | - Hagai Cohen
- Institute of Plant Sciences, Agricultural Research Organization, 7505101, Rishon LeZion, Israel
| | - Dabing Zhang
- Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Asaph Aharoni
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, 76100, Rehovot, Israel.
| | - Jianxin Shi
- Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
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Wu Y, Wen J, Xia Y, Zhang L, Du H. Evolution and functional diversification of R2R3-MYB transcription factors in plants. HORTICULTURE RESEARCH 2022; 9:uhac058. [PMID: 35591925 PMCID: PMC9113232 DOI: 10.1093/hr/uhac058] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 02/24/2022] [Indexed: 05/31/2023]
Abstract
R2R3-MYB genes (R2R3-MYBs) form one of the largest transcription factor gene families in the plant kingdom, with substantial structural and functional diversity. However, the evolutionary processes leading to this amazing functional diversity have not yet been clearly established. Recently developed genomic and classical molecular technologies have provided detailed insights into the evolutionary relationships and functions of plant R2R3-MYBs. Here, we review recent genome-level and functional analyses of plant R2R3-MYBs, with an emphasis on their evolution and functional diversification. In land plants, this gene family underwent a large expansion by whole genome duplications and small-scale duplications. Along with this population explosion, a series of functionally conserved or lineage-specific subfamilies/groups arose with roles in three major plant-specific biological processes: development and cell differentiation, specialized metabolism, and biotic and abiotic stresses. The rapid expansion and functional diversification of plant R2R3-MYBs are highly consistent with the increasing complexity of angiosperms. In particular, recently derived R2R3-MYBs with three highly homologous intron patterns (a, b, and c) are disproportionately related to specialized metabolism and have become the predominant subfamilies in land plant genomes. The evolution of plant R2R3-MYBs is an active area of research, and further studies are expected to improve our understanding of the evolution and functional diversification of this gene family.
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Affiliation(s)
- Yun Wu
- Department of Landscape Architecture, School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, 310018, China
- Genomics and Genetic Engineering Laboratory of Ornamental Plants, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Jing Wen
- College of Agronomy and Biotechnology, Southwest University, Chongqing, 400716, China
| | - Yiping Xia
- Genomics and Genetic Engineering Laboratory of Ornamental Plants, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Liangsheng Zhang
- Genomics and Genetic Engineering Laboratory of Ornamental Plants, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Hai Du
- College of Agronomy and Biotechnology, Southwest University, Chongqing, 400716, China
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Wang Z, Wang S, Liu P, Yang X, He X, Xie X, Luo Z, Wu M, Wang C, Yang J. Molecular cloning and functional characterization of NtWRKY41a in the biosynthesis of phenylpropanoids in Nicotiana tabacum. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 315:111154. [PMID: 35067314 DOI: 10.1016/j.plantsci.2021.111154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/21/2021] [Accepted: 12/11/2021] [Indexed: 06/14/2023]
Abstract
Phenylpropanoids are important secondary metabolites that have multifaceted effects on plant growth, development, and environmental adaptation. WRKY41 has been shown to repress anthocyanins synthesis in Arabidopsis, but its full roles in regulating plant phenylpropanoids metabolism still remains to be further studied. Here, we cloned two NtWRKY41 genes from N. tabacum genome, and NtWRKY41a showed higher expression levels than NtWRKY41b genes in all the tobacco tissues examined. Overexpression and knock-out of NtWRKY41a gene revealed that NtWRKY41a promoted the biosynthesis of Chlorogenic acid (CGA) and lignin, but repressed the accumulation of scopoletin and flavonoids in tobacco. Transcriptome analysis found 7 phenylpropanoids related differentially expressed genes (DEGs) between WT and NtWRKY41a-OE plants, among which the transcription of NtCCoAOMT and NtHST was significantly induced by posttranslational activation of NtWRKY41a, while those of NtF6'H1 and NtGT3 was significantly repressed by NtWRKY41a. Chromatin immunoprecipitation and Dual-Luc assays further indicated that NtWRKY41a could bind to the promoter regions of these four genes to regulate their transcription. Moreover, ectopic expression of NtWRKY41a also promoted the transcription of several NtLOX and NtHPL genes, which encode key enzymes involved in the oxylipin pathway. Our findings revealed new functions of NtWRKY41a in modulating the distribution of metabolism flux in phenylpropanoids pathway, and provided a promising target for manipulating phenylpropanoids contents in tobacco.
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Affiliation(s)
- Zhong Wang
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, China
| | - Shuaibin Wang
- Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha, 410007, China
| | - Pingping Liu
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, China
| | - Xiaonian Yang
- Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha, 410007, China
| | - Xinxi He
- Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha, 410007, China
| | - Xiaodong Xie
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, China
| | - Zhaopeng Luo
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, China
| | - Mingzhu Wu
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, China
| | - Chen Wang
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, China
| | - Jun Yang
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, China.
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Wang X, Chao N, Zhang A, Kang J, Jiang X, Gai Y. Systematic Analysis and Biochemical Characterization of the Caffeoyl Shikimate Esterase Gene Family in Poplar. Int J Mol Sci 2021; 22:ijms222413366. [PMID: 34948162 PMCID: PMC8704367 DOI: 10.3390/ijms222413366] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/09/2021] [Accepted: 12/10/2021] [Indexed: 02/07/2023] Open
Abstract
Caffeoyl shikimate esterase (CSE) hydrolyzes caffeoyl shikimate into caffeate and shikimate in the phenylpropanoid pathway. In this study, we performed a systematic analysis of the CSE gene family and investigated the possible roles of CSE and CSE-like genes in Populus. We conducted a genome-wide analysis of the CSE gene family, including functional and phylogenetic analyses of CSE and CSE-like genes, using the poplar (Populus trichocarpa) genome. Eighteen CSE and CSE-like genes were identified in the Populus genome, and five phylogenetic groups were identified from phylogenetic analysis. CSEs in Group Ia, which were proposed as bona fide CSEs, have probably been lost in most monocots except Oryza sativa. Primary functional classification showed that PoptrCSE1 and PoptrCSE2 had putative function in lignin biosynthesis. In addition, PoptrCSE2, along with PoptrCSE12, might also respond to stress with a function in cell wall biosynthesis. Enzymatic assay of PoptoCSE1 (Populus tomentosa), -2 and -12 showed that PoptoCSE1 and -2 maintained CSE activity. PoptoCSE1 and 2 had similar biochemical properties, tissue expression patterns and subcellular localization. Most of the PoptrCSE-like genes are homologs of AtMAGL (monoacylglycerol lipase) genes in Arabidopsis and may function as MAG lipase in poplar. Our study provides a systematic understanding of this novel gene family and suggests the function of CSE in monolignol biosynthesis in Populus.
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Affiliation(s)
- Xuechun Wang
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (X.W.); (N.C.); (A.Z.); (J.K.); (X.J.)
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory, National Forestry and Grassland Administration, Beijing 100083, China
- National Engineering Laboratory for Tree Breeding, Beijing 100083, China
- Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing 100083, China
| | - Nan Chao
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (X.W.); (N.C.); (A.Z.); (J.K.); (X.J.)
- Jiangsu Key Laboratory of Sericutural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, China
| | - Aijing Zhang
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (X.W.); (N.C.); (A.Z.); (J.K.); (X.J.)
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory, National Forestry and Grassland Administration, Beijing 100083, China
- National Engineering Laboratory for Tree Breeding, Beijing 100083, China
- Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing 100083, China
| | - Jiaqi Kang
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (X.W.); (N.C.); (A.Z.); (J.K.); (X.J.)
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory, National Forestry and Grassland Administration, Beijing 100083, China
- National Engineering Laboratory for Tree Breeding, Beijing 100083, China
- Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing 100083, China
| | - Xiangning Jiang
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (X.W.); (N.C.); (A.Z.); (J.K.); (X.J.)
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory, National Forestry and Grassland Administration, Beijing 100083, China
- National Engineering Laboratory for Tree Breeding, Beijing 100083, China
- Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing 100083, China
| | - Ying Gai
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (X.W.); (N.C.); (A.Z.); (J.K.); (X.J.)
- The Tree and Ornamental Plant Breeding and Biotechnology Laboratory, National Forestry and Grassland Administration, Beijing 100083, China
- National Engineering Laboratory for Tree Breeding, Beijing 100083, China
- Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, Beijing 100083, China
- Correspondence: ; Tel.: +86-10-6233-8063
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Zhang Q, Zhong T, E L, Xu M, Dai W, Sun S, Ye J. GT Factor ZmGT-3b Is Associated With Regulation of Photosynthesis and Defense Response to Fusarium graminearum Infection in Maize Seedling. FRONTIERS IN PLANT SCIENCE 2021; 12:724133. [PMID: 34868109 PMCID: PMC8638620 DOI: 10.3389/fpls.2021.724133] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Accepted: 10/04/2021] [Indexed: 05/24/2023]
Abstract
It is of critical importance for plants to correctly and efficiently allocate their resources between growth and defense to optimize fitness. Transcription factors (TFs) play crucial roles in the regulation of plant growth and defense response. Trihelix TFs display multifaceted functions in plant growth, development, and responses to various biotic and abiotic stresses. In our previous investigation of maize stalk rot disease resistance mechanism, we found a trihelix TF gene, ZmGT-3b, which is primed for its response to Fusarium graminearum challenge by implementing a rapid and significant reduction of its expression to suppress seedling growth and enhance disease resistance. The disease resistance to F. graminearum was consistently increased and drought tolerance was improved, while seedling growth was suppressed and photosynthesis activity was significantly reduced in the ZmGT-3b knockdown seedlings. Thus, the seedlings finally led to show a kind of growth-defense trade-off phenotype. Moreover, photosynthesis-related genes were specifically downregulated, especially ZmHY5, which encodes a conserved central regulator of seedling development and light responses; ZmGT-3b was confirmed to be a novel interacting partner of ZmHY5 in yeast and in planta. Constitutive defense responses were synchronically activated in the ZmGT-3b knockdown seedlings as many defense-related genes were significantly upregulated, and the contents of major cell wall components, such as lignin, were increased in the ZmGT-3b knockdown seedlings. These suggest that ZmGT-3b is involved in the coordination of the metabolism during growth-defense trade-off by optimizing the temporal and spatial expression of photosynthesis- and defense-related genes.
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Li C, Wang K, Lei C, Cao S, Huang Y, Ji N, Xu F, Zheng Y. Alterations in Sucrose and Phenylpropanoid Metabolism Affected by BABA-Primed Defense in Postharvest Grapes and the Associated Transcriptional Mechanism. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2021; 34:1250-1266. [PMID: 34410840 DOI: 10.1094/mpmi-06-21-0142-r] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Defense elicitors can induce fruit disease resistance to control postharvest decay but may incur quality impairment. Our present work aimed to investigate the resistance against Botrytis cinerea induced by the elicitor β-aminobutyric acid (BABA) and to elucidate the specific transcriptional mechanism implicated in defense-related metabolic regulations. The functional dissection results demonstrated that, after inoculation with the fungal necrotroph B. cinerea, a suite of critical genes encoding enzymes related to the sucrose metabolism and phenylpropanoid pathway in priming defense in grapes were transcriptionally induced by treatment with 10 mM BABA. In contrast, more UDP-glucose, a shared precursor of phenylpropanoid and sucrose metabolism, may be redirected to the phenylpropanoid pathway for the synthesis of phytoalexins, including trans-resveratrol and ɛ-viniferin, in 100 mM BABA-treated grapes, resulting in direct resistance but compromised soluble sugar contents. An R2R3-type MYB protein from Vitis vinifera, VvMYB44, was isolated and characterized. VvMYB44 expression was significantly induced upon the grapes expressed defensive reaction. Subcellular localization, yeast two-hybrid, and coimmunoprecipitation assays revealed that the nuclear-localized VvMYB44 physically interacted with the salicylic acid-responsive transcription coactivator NPR1 in vivo for defense expression. In addition, VvMYB44 directly bound to the promoter regions of sucrose and phenylpropanoid metabolism-related genes and transactivated their expression, thus tipping the balance of antifungal compound accumulation and soluble sugar maintenance. Hence, these results suggest that 2R-type VvMYB44 might be a potential positive participant in BABA-induced priming defense in grape berries that contributes to avoiding the excessive consumption of soluble sugars during the postharvest storage.[Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Chunhong Li
- College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing 404000, China
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095 Jiangsu, China
| | - Kaituo Wang
- College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing 404000, China
| | - Changyi Lei
- College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing 404000, China
| | - Shifeng Cao
- College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315211, China
| | - Yixiao Huang
- College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing 404000, China
- College of Arts and Sciences, University of Miami, Coral Gables, FL 33143, U.S.A
| | - Nana Ji
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095 Jiangsu, China
| | - Feng Xu
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095 Jiangsu, China
| | - Yonghua Zheng
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095 Jiangsu, China
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Kumar R, Gyawali A, Morrison GD, Saski CA, Robertson DJ, Cook DD, Tharayil N, Schaefer RJ, Beissinger TM, Sekhon RS. Genetic Architecture of Maize Rind Strength Revealed by the Analysis of Divergently Selected Populations. PLANT & CELL PHYSIOLOGY 2021; 62:1199-1214. [PMID: 34015110 DOI: 10.1093/pcp/pcab059] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 05/04/2021] [Accepted: 05/19/2021] [Indexed: 06/12/2023]
Abstract
The strength of the stalk rind, measured as rind penetrometer resistance (RPR), is an important contributor to stalk lodging resistance. To enhance the genetic architecture of RPR, we combined selection mapping on populations developed by 15 cycles of divergent selection for high and low RPR with time-course transcriptomic and metabolic analyses of the stalks. Divergent selection significantly altered allele frequencies of 3,656 and 3,412 single- nucleotide polymorphisms (SNPs) in the high and low RPR populations, respectively. Surprisingly, only 110 (1.56%) SNPs under selection were common in both populations, while the majority (98.4%) were unique to each population. This result indicated that high and low RPR phenotypes are produced by biologically distinct mechanisms. Remarkably, regions harboring lignin and polysaccharide genes were preferentially selected in high and low RPR populations, respectively. The preferential selection was manifested as higher lignification and increased saccharification of the high and low RPR stalks, respectively. The evolution of distinct gene classes according to the direction of selection was unexpected in the context of parallel evolution and demonstrated that selection for a trait, albeit in different directions, does not necessarily act on the same genes. Tricin, a grass-specific monolignol that initiates the incorporation of lignin in the cell walls, emerged as a key determinant of RPR. Integration of selection mapping and transcriptomic analyses with published genetic studies of RPR identified several candidate genes including ZmMYB31, ZmNAC25, ZmMADS1, ZmEXPA2, ZmIAA41 and hk5. These findings provide a foundation for an enhanced understanding of RPR and the improvement of stalk lodging resistance.
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Affiliation(s)
- Rohit Kumar
- Department of Genetics and Biochemistry, Clemson University, Clemson, SC 29634, USA
| | - Abiskar Gyawali
- Division of Biological Sciences, University of Missouri, 105 Tucker Hall, Columbia, MO 65211, USA
| | - Ginnie D Morrison
- Division of Biological Sciences, University of Missouri, 105 Tucker Hall, Columbia, MO 65211, USA
| | - Christopher A Saski
- Department of Plant and Environmental Sciences, Clemson University, Clemson, SC 29634, USA
| | - Daniel J Robertson
- Department of Mechanical Engineering, University of Idaho, Moscow, ID, USA
| | - Douglas D Cook
- Department of Mechanical Engineering, Brigham Young University, Provo, UT, USA
| | - Nishanth Tharayil
- Department of Plant and Environmental Sciences, Clemson University, Clemson, SC 29634, USA
| | | | - Timothy M Beissinger
- Department of Plant Breeding Methodology, University of Göttingen, Göttingen 37075, Germany
- Center for Integrated Breeding Research, University of Göttingen, Göttingen 37075, Germany
| | - Rajandeep S Sekhon
- Department of Genetics and Biochemistry, Clemson University, Clemson, SC 29634, USA
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12
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Xiao R, Zhang C, Guo X, Li H, Lu H. MYB Transcription Factors and Its Regulation in Secondary Cell Wall Formation and Lignin Biosynthesis during Xylem Development. Int J Mol Sci 2021; 22:3560. [PMID: 33808132 PMCID: PMC8037110 DOI: 10.3390/ijms22073560] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 03/26/2021] [Accepted: 03/26/2021] [Indexed: 01/12/2023] Open
Abstract
The secondary wall is the main part of wood and is composed of cellulose, xylan, lignin, and small amounts of structural proteins and enzymes. Lignin molecules can interact directly or indirectly with cellulose, xylan and other polysaccharide molecules in the cell wall, increasing the mechanical strength and hydrophobicity of plant cells and tissues and facilitating the long-distance transportation of water in plants. MYBs (v-myb avian myeloblastosis viral oncogene homolog) belong to one of the largest superfamilies of transcription factors, the members of which regulate secondary cell-wall formation by promoting/inhibiting the biosynthesis of lignin, cellulose, and xylan. Among them, MYB46 and MYB83, which comprise the second layer of the main switch of secondary cell-wall biosynthesis, coordinate upstream and downstream secondary wall synthesis-related transcription factors. In addition, MYB transcription factors other than MYB46/83, as well as noncoding RNAs, hormones, and other factors, interact with one another to regulate the biosynthesis of the secondary wall. Here, we discuss the biosynthesis of secondary wall, classification and functions of MYB transcription factors and their regulation of lignin polymerization and secondary cell-wall formation during wood formation.
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Affiliation(s)
- Ruixue Xiao
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (R.X.); (H.L.)
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (C.Z.); (X.G.)
| | - Chong Zhang
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (C.Z.); (X.G.)
| | - Xiaorui Guo
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (C.Z.); (X.G.)
| | - Hui Li
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (R.X.); (H.L.)
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (C.Z.); (X.G.)
| | - Hai Lu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China; (R.X.); (H.L.)
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China; (C.Z.); (X.G.)
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13
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Coomey JH, Sibout R, Hazen SP. Grass secondary cell walls, Brachypodium distachyon as a model for discovery. THE NEW PHYTOLOGIST 2020; 227:1649-1667. [PMID: 32285456 DOI: 10.1111/nph.16603] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 03/05/2020] [Indexed: 05/20/2023]
Abstract
A key aspect of plant growth is the synthesis and deposition of cell walls. In specific tissues and cell types including xylem and fibre, a thick secondary wall comprised of cellulose, hemicellulose and lignin is deposited. Secondary cell walls provide a physical barrier that protects plants from pathogens, promotes tolerance to abiotic stresses and fortifies cells to withstand the forces associated with water transport and the physical weight of plant structures. Grasses have numerous cell wall features that are distinct from eudicots and other plants. Study of the model species Brachypodium distachyon as well as other grasses has revealed numerous features of the grass cell wall. These include the characterisation of xylosyl and arabinosyltransferases, a mixed-linkage glucan synthase and hydroxycinnamate acyltransferases. Perhaps the most fertile area for discovery has been the formation of lignins, including the identification of novel substrates and enzyme activities towards the synthesis of monolignols. Other enzymes function as polymerising agents or transferases that modify lignins and facilitate interactions with polysaccharides. The regulatory aspects of cell wall biosynthesis are largely overlapping with those of eudicots, but salient differences among species have been resolved that begin to identify the determinants that define grass cell walls.
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Affiliation(s)
- Joshua H Coomey
- Biology Department, University of Massachusetts, Amherst, MA, 01003, USA
- Plant Biology Graduate Program, University of Massachusetts, Amherst, MA, 01003, USA
| | - Richard Sibout
- Biopolymères Interactions Assemblages, INRAE, UR BIA, F-44316, Nantes, France
| | - Samuel P Hazen
- Biology Department, University of Massachusetts, Amherst, MA, 01003, USA
- Plant Biology Graduate Program, University of Massachusetts, Amherst, MA, 01003, USA
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14
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Singh V, Kumar N, Dwivedi AK, Sharma R, Sharma MK. Phylogenomic Analysis of R2R3 MYB Transcription Factors in Sorghum and their Role in Conditioning Biofuel Syndrome. Curr Genomics 2020; 21:138-154. [PMID: 32655308 PMCID: PMC7324873 DOI: 10.2174/1389202921666200326152119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 03/17/2020] [Accepted: 03/19/2020] [Indexed: 11/30/2022] Open
Abstract
Background Large scale cultivation of sorghum for food, feed, and biofuel requires concerted efforts for engineering multipurpose cultivars with optimised agronomic traits. Due to their vital role in regulating the biosynthesis of phenylpropanoid-derived compounds, biomass composition, biotic, and abiotic stress response, R2R3-MYB family transcription factors are ideal targets for improving environmental resilience and economic value of sorghum. Methods We used diverse computational biology tools to survey the sorghum genome to identify R2R3-MYB transcription factors followed by their structural and phylogenomic analysis. We used in-house generated as well as publicly available high throughput expression data to analyse the R2R3 expression patterns in various sorghum tissue types. Results We have identified a total of 134 R2R3-MYB genes from sorghum and developed a framework to predict gene functions. Collating information from the physical location, duplication, structural analysis, orthologous sequences, phylogeny, and expression patterns revealed the role of duplications in clade-wise expansion of the R2R3-MYB family as well as intra-clade functional diversification. Using publicly available and in-house generated RNA sequencing data, we provide MYB candidates for conditioning biofuel syndrome by engineering phenylpropanoid biosynthesis and sugar signalling pathways in sorghum. Conclusion The results presented here are pivotal to prioritize MYB genes for functional validation and optimize agronomic traits in sorghum.
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Affiliation(s)
- Vinay Singh
- 1Crop Genetics & Informatics Group, School of Biotechnology, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India; 2Crop Genetics & Informatics Group, School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India
| | - Neeraj Kumar
- 1Crop Genetics & Informatics Group, School of Biotechnology, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India; 2Crop Genetics & Informatics Group, School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India
| | - Anuj K Dwivedi
- 1Crop Genetics & Informatics Group, School of Biotechnology, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India; 2Crop Genetics & Informatics Group, School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India
| | - Rita Sharma
- 1Crop Genetics & Informatics Group, School of Biotechnology, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India; 2Crop Genetics & Informatics Group, School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India
| | - Manoj K Sharma
- 1Crop Genetics & Informatics Group, School of Biotechnology, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India; 2Crop Genetics & Informatics Group, School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Mehrauli Road, New Delhi-110067, India
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15
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Yadav V, Wang Z, Wei C, Amo A, Ahmed B, Yang X, Zhang X. Phenylpropanoid Pathway Engineering: An Emerging Approach towards Plant Defense. Pathogens 2020; 9:pathogens9040312. [PMID: 32340374 PMCID: PMC7238016 DOI: 10.3390/pathogens9040312] [Citation(s) in RCA: 146] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 04/11/2020] [Accepted: 04/17/2020] [Indexed: 11/23/2022] Open
Abstract
Pathogens hitting the plant cell wall is the first impetus that triggers the phenylpropanoid pathway for plant defense. The phenylpropanoid pathway bifurcates into the production of an enormous array of compounds based on the few intermediates of the shikimate pathway in response to cell wall breaches by pathogens. The whole metabolomic pathway is a complex network regulated by multiple gene families and it exhibits refined regulatory mechanisms at the transcriptional, post-transcriptional, and post-translational levels. The pathway genes are involved in the production of anti-microbial compounds as well as signaling molecules. The engineering in the metabolic pathway has led to a new plant defense system of which various mechanisms have been proposed including salicylic acid and antimicrobial mediated compounds. In recent years, some key players like phenylalanine ammonia lyases (PALs) from the phenylpropanoid pathway are proposed to have broad spectrum disease resistance (BSR) without yield penalties. Now we have more evidence than ever, yet little understanding about the pathway-based genes that orchestrate rapid, coordinated induction of phenylpropanoid defenses in response to microbial attack. It is not astonishing that mutants of pathway regulator genes can show conflicting results. Therefore, precise engineering of the pathway is an interesting strategy to aim at profitably tailored plants. Here, this review portrays the current progress and challenges for phenylpropanoid pathway-based resistance from the current prospective to provide a deeper understanding.
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Affiliation(s)
- Vivek Yadav
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of horticulture, Northwest A&F University, Xianyang 712100, China; (V.Y.); (Z.W.); (C.W.); (B.A.); (X.Y.)
| | - Zhongyuan Wang
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of horticulture, Northwest A&F University, Xianyang 712100, China; (V.Y.); (Z.W.); (C.W.); (B.A.); (X.Y.)
| | - Chunhua Wei
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of horticulture, Northwest A&F University, Xianyang 712100, China; (V.Y.); (Z.W.); (C.W.); (B.A.); (X.Y.)
| | - Aduragbemi Amo
- College of Agronomy, Northwest A&F University, Xianyang 712100, China;
| | - Bilal Ahmed
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of horticulture, Northwest A&F University, Xianyang 712100, China; (V.Y.); (Z.W.); (C.W.); (B.A.); (X.Y.)
| | - Xiaozhen Yang
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of horticulture, Northwest A&F University, Xianyang 712100, China; (V.Y.); (Z.W.); (C.W.); (B.A.); (X.Y.)
| | - Xian Zhang
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of horticulture, Northwest A&F University, Xianyang 712100, China; (V.Y.); (Z.W.); (C.W.); (B.A.); (X.Y.)
- Correspondence: ; Tel.: +86-029-8708-2613
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16
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Hennet L, Berger A, Trabanco N, Ricciuti E, Dufayard JF, Bocs S, Bastianelli D, Bonnal L, Roques S, Rossini L, Luquet D, Terrier N, Pot D. Transcriptional Regulation of Sorghum Stem Composition: Key Players Identified Through Co-expression Gene Network and Comparative Genomics Analyses. FRONTIERS IN PLANT SCIENCE 2020; 11:224. [PMID: 32194601 PMCID: PMC7064007 DOI: 10.3389/fpls.2020.00224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 02/12/2020] [Indexed: 06/10/2023]
Abstract
Most sorghum biomass accumulates in stem secondary cell walls (SCW). As sorghum stems are used as raw materials for various purposes such as feed, energy and fiber reinforced polymers, identifying the genes responsible for SCW establishment is highly important. Taking advantage of studies performed in model species, most of the structural genes contributing at the molecular level to the SCW biosynthesis in sorghum have been proposed while their regulatory factors have mostly not been determined. Validation of the role of several MYB and NAC transcription factors in SCW regulation in Arabidopsis and a few other species has been provided. In this study, we contributed to the recent efforts made in grasses to uncover the mechanisms underlying SCW establishment. We reported updated phylogenies of NAC and MYB in 9 different species and exploited findings from other species to highlight candidate regulators of SCW in sorghum. We acquired expression data during sorghum internode development and used co-expression analyses to determine groups of co-expressed genes that are likely to be involved in SCW establishment. We were able to identify two groups of co-expressed genes presenting multiple evidences of involvement in SCW building. Gene enrichment analysis of MYB and NAC genes provided evidence that while NAC SECONDARY WALL THICKENING PROMOTING FACTOR NST genes and SECONDARY WALL-ASSOCIATED NAC DOMAIN PROTEIN gene functions appear to be conserved in sorghum, NAC master regulators of SCW in sorghum may not be as tissue compartmentalized as in Arabidopsis. We showed that for every homolog of the key SCW MYB in Arabidopsis, a similar role is expected for sorghum. In addition, we unveiled sorghum MYB and NAC that have not been identified to date as being involved in cell wall regulation. Although specific validation of the MYB and NAC genes uncovered in this study is needed, we provide a network of sorghum genes involved in SCW both at the structural and regulatory levels.
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Affiliation(s)
- Lauriane Hennet
- CIRAD, UMR AGAP, Montpellier, France
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Angélique Berger
- CIRAD, UMR AGAP, Montpellier, France
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Noemi Trabanco
- Parco Tecnologico Padano, Lodi, Italy
- Centro de Biotecnología y Genómica de Plantas, UPM-INIA, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain
| | - Emeline Ricciuti
- CIRAD, UMR AGAP, Montpellier, France
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Jean-François Dufayard
- CIRAD, UMR AGAP, Montpellier, France
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Stéphanie Bocs
- CIRAD, UMR AGAP, Montpellier, France
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Denis Bastianelli
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
- CIRAD, UMR SELMET, Montpellier, France
| | - Laurent Bonnal
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
- CIRAD, UMR SELMET, Montpellier, France
| | - Sandrine Roques
- CIRAD, UMR AGAP, Montpellier, France
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Laura Rossini
- Parco Tecnologico Padano, Lodi, Italy
- Department of Agricultural and Environmental Sciences - Production, Landscape, Agroenergy, Università degli Studi di Milano, Milan, Italy
| | - Delphine Luquet
- CIRAD, UMR AGAP, Montpellier, France
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - Nancy Terrier
- AGAP, CIRAD, INRAE, Montpellier SupAgro, University of Montpellier, Montpellier, France
| | - David Pot
- CIRAD, UMR AGAP, Montpellier, France
- CIRAD, INRA, Montpellier SupAgro, University of Montpellier, Montpellier, France
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17
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Yu Y, Liu H, Zhang N, Gao C, Qi L, Wang C. The BpMYB4 Transcription Factor From Betula platyphylla Contributes Toward Abiotic Stress Resistance and Secondary Cell Wall Biosynthesis. FRONTIERS IN PLANT SCIENCE 2020; 11:606062. [PMID: 33537043 PMCID: PMC7847980 DOI: 10.3389/fpls.2020.606062] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 12/21/2020] [Indexed: 05/19/2023]
Abstract
The MYB (v-myb avian myeloblastosis viral oncogene homolog) family is one of the largest transcription factor families in plants, and is widely involved in the regulation of plant metabolism. In this study, we show that a MYB4 transcription factor, BpMYB4, identified from birch (Betula platyphylla Suk.) and homologous to EgMYB1 from Eucalyptus robusta Smith and ZmMYB31 from Zea mays L. is involved in secondary cell wall synthesis. The expression level of BpMYB4 was higher in flowers relative to other tissues, and was induced by artificial bending and gravitational stimuli in developing xylem tissues. The expression of this gene was not enriched in the developing xylem during the active season, and showed higher transcript levels in xylem tissues around sprouting and near the dormant period. BpMYB4 also was induced express by abiotic stress. Functional analysis indicated that expression of BpMYB4 in transgenic Arabidopsis (Arabidopsis thaliana) plants could promote the growth of stems, and result in increased number of inflorescence stems and shoots. Anatomical observation of stem sections showed lower lignin deposition, and a chemical contents test also demonstrated increased cellulose and decreased lignin content in the transgenic plants. In addition, treatment with 100 mM NaCl and 200 mM mannitol resulted in the germination rate of the over-expressed lines being higher than that of the wild-type seeds. The proline content in transgenic plants was higher than that in WT, but MDA content was lower than that in WT. Further investigation in birch using transient transformation techniques indicated that overexpression of BpMYB4 could scavenge hydrogen peroxide and O2 .- and reduce cell damage, compared with the wild-type plants. Therefore, we believe that BpMYB4 promotes stem development and cellulose biosynthesis as an inhibitor of lignin biosynthesis, and has a function in abiotic stress resistance.
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Affiliation(s)
- Ying Yu
- State Key Laboratory of Tree Genetics and Breeding, School of Forestry, Northeast Forestry University, Harbin, China
| | - Huizi Liu
- State Key Laboratory of Tree Genetics and Breeding, School of Forestry, Northeast Forestry University, Harbin, China
| | - Nan Zhang
- State Key Laboratory of Tree Genetics and Breeding, School of Forestry, Northeast Forestry University, Harbin, China
| | - Caiqiu Gao
- State Key Laboratory of Tree Genetics and Breeding, School of Forestry, Northeast Forestry University, Harbin, China
| | - Liwang Qi
- Chinese Academy of Forestry, Beijing, China
- Liwang Qi,
| | - Chao Wang
- State Key Laboratory of Tree Genetics and Breeding, School of Forestry, Northeast Forestry University, Harbin, China
- *Correspondence: Chao Wang,
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18
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Cho J, Jeon H, Kim M, Vo TK, Kim J, Park E, Choi Y, Lee H, Han K, Ko J. Wood forming tissue-specific bicistronic expression of PdGA20ox1 and PtrMYB221 improves both the quality and quantity of woody biomass production in a hybrid poplar. PLANT BIOTECHNOLOGY JOURNAL 2019; 17:1048-1057. [PMID: 30515982 PMCID: PMC6523601 DOI: 10.1111/pbi.13036] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 09/27/2018] [Accepted: 10/28/2018] [Indexed: 05/22/2023]
Abstract
With the exponential growth of the human population and industrial developments, research on renewable energy resources is required to alleviate environmental and economic impacts caused by the consumption of fossil fuels. In this study, we present a synthetic biological application of a wood forming tissue-specific bicistronic gene expression system to improve both the quantity and quality of woody biomass to minimize undesirable growth penalties. Our transgenic poplars, designed to express both PdGA20ox1 (a GA20-oxidase from Pinus densiflora producing bioactive gibberellin, GA) and PtrMYB221 (a MYB transcription factor negatively regulating lignin biosynthesis) under the developing xylem (DX) tissue-specific promoter (i.e., DX15::PdGA20ox1-2A-PtrMYB221 poplar), resulted in a 2-fold increase in biomass quantity compared to wild-type (WT), without undesirable growth defects. A similar phenotype was observed in transgenic Arabidopsis plants harboring the same gene constructs. These phenotypic consequences were further verified in the field experiments. Importantly, our transgenic poplars exhibited an improved quality of biomass with reduced lignin content (~16.0 wt%) but increased holocellulose content (~6.6 wt%). Furthermore, the saccharification efficiency of our transgenic poplar increased significantly by up to 8%. Our results demonstrate that the controlled production of both GA and a secondary wall modifying regulator in the same spatio-temporal manner can be utilized as an efficient biotechnological tool for producing the desired multi-purpose woody biomass.
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Affiliation(s)
- Jin‐Seong Cho
- Department of Plant & Environmental New ResourcesKyung Hee UniversityYonginKorea
| | - Hyung‐Woo Jeon
- Department of Plant & Environmental New ResourcesKyung Hee UniversityYonginKorea
| | - Min‐Ha Kim
- Department of Plant & Environmental New ResourcesKyung Hee UniversityYonginKorea
| | - The K. Vo
- Department of Chemical EngineeringKyung Hee UniversityYonginKorea
| | - Jinsoo Kim
- Department of Chemical EngineeringKyung Hee UniversityYonginKorea
| | - Eung‐Jun Park
- Division of Forest BiotechnologyKorea Forest Research InstituteSuwonKorea
| | - Young‐Im Choi
- Division of Forest BiotechnologyKorea Forest Research InstituteSuwonKorea
| | - Hyoshin Lee
- Division of Forest BiotechnologyKorea Forest Research InstituteSuwonKorea
| | - Kyung‐Hwan Han
- Department of Horticulture and Department of ForestryMichigan State UniversityEast LansingMIUSA
| | - Jae‐Heung Ko
- Department of Plant & Environmental New ResourcesKyung Hee UniversityYonginKorea
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19
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Zheng L, Chen Y, Ding D, Zhou Y, Ding L, Wei J, Wang H. Endoplasmic reticulum-localized UBC34 interaction with lignin repressors MYB221 and MYB156 regulates the transactivity of the transcription factors in Populus tomentosa. BMC PLANT BIOLOGY 2019; 19:97. [PMID: 30866808 PMCID: PMC6416899 DOI: 10.1186/s12870-019-1697-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 02/27/2019] [Indexed: 05/06/2023]
Abstract
BACKGROUND Regulation of lignin biosynthesis is known to occur at the level of transcription factors (TFs), of which R2R3-MYB family members have been proposed to play a central role via the AC cis-elements. Despite the important roles of TFs in lignin biosynthesis, the post-translational regulation of these TFs, particularly their ubiquitination regulation, has not been thoroughly explored. RESULTS We describe the discovery of a Populus tomentosa E2 ubiquitin-conjugating enzyme 34 (PtoUBC34), which is involved in the post-translational regulation of transactivation activity of lignin-associated transcriptional repressors PtoMYB221 and PtoMYB156. PtoUBC34 is localized at the endoplasmic reticulum (ER) membrane where it interacts with transcriptional repressors PtoMYB221 and PtoMYB156. This specific interaction allows for the translocation of TFs PtoMYB221 and PtoMYB156 to the ER and reduces their repression activity in a PtoUBC34 abundance-dependent manner. By taking a molecular biology approach with quantitative real-time polymerase chain reaction (qRT-PCR) analysis, we found that PtoUBC34 is expressed in all aboveground tissues of trees in P. tomentosa, and in particular, it is ubiquitous in all distinct differentiation stages across wood formation, including phloem differentiation, cambium maintaining, early and developing xylem differentiation, secondary cell wall thickening, and programmed cell death. Additionally, we discovered that PtoUBC34 is induced by treatment with sodium chloride and heat shock. CONCLUSIONS Our data suggest a possible mechanism by which lignin biosynthesis is regulated by ER-localized PtoUBC34 in poplar, probably through the ER-associated degradation (ERAD) of lignin-associated repressors PtoMYB221 and PtoMYB156.
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Affiliation(s)
- Lin Zheng
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
| | - Yajuan Chen
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
- Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
| | - Dong Ding
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
| | - Ying Zhou
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
| | - Liping Ding
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
- Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
| | - Jianhua Wei
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
- Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
| | - Hongzhi Wang
- Beijing Agro-Biotechnology Research Center, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
- Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology, Beijing Academy of Agricultural and Forestry Sciences, No. 9, Shuguang Huayuan Middle Road, Haidian District, Beijing, 100097 People’s Republic of China
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20
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Ma D, Constabel CP. MYB Repressors as Regulators of Phenylpropanoid Metabolism in Plants. TRENDS IN PLANT SCIENCE 2019; 24:275-289. [PMID: 30704824 DOI: 10.1016/j.tplants.2018.12.003] [Citation(s) in RCA: 179] [Impact Index Per Article: 35.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 12/12/2018] [Accepted: 12/22/2018] [Indexed: 05/19/2023]
Abstract
The phenylpropanoid pathway gives rise to lignin, flavonoids, and other metabolites and is regulated by MYB transcription factors. Many R2R3-MYB transcriptional activators are known, but the prevalence of MYB repressors has only recently become recognized. This review article summarizes recent progress on function and mechanism of these MYB repressors. The characterized phenylpropanoid R2R3-MYB repressors comprise two phylogenetic clades that act on the lignin and general phenylpropanoid genes, or the flavonoid genes, respectively; anthocyanin R3-MYB repressors form a separate clade. While some flavonoid MYBs repressors can bind basic-helix-loop-helix factors and disrupt the MBW complex, for the lignin repressor MYBs interactions with promoter cis-elements have been demonstrated. The role of the conserved repression motifs that define the MYB repressors is not yet known, however.
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Affiliation(s)
- Dawei Ma
- Centre for Forest Biology and Department of Biology, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada
| | - C Peter Constabel
- Centre for Forest Biology and Department of Biology, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada.
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21
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Chen S, Wu F, Li Y, Qian Y, Pan X, Li F, Wang Y, Wu Z, Fu C, Lin H, Yang A. NtMYB4 and NtCHS1 Are Critical Factors in the Regulation of Flavonoid Biosynthesis and Are Involved in Salinity Responsiveness. FRONTIERS IN PLANT SCIENCE 2019; 10:178. [PMID: 30846995 PMCID: PMC6393349 DOI: 10.3389/fpls.2019.00178] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 02/05/2019] [Indexed: 05/19/2023]
Abstract
High levels of salinity induce serious oxidative damage in plants. Flavonoids, as antioxidants, have important roles in reactive oxygen species (ROS) scavenging. In the present study, the tobacco R2R3 MYB type repressor, NtMYB4, was isolated and characterized. The expression of NtMYB4 was suppressed by salinity. Overexpression of NtMYB4 reduced the salt tolerance in transgenic tobacco plants. NtMYB4 repressed the promoter activity of NtCHS1 and negatively regulated its expression. Rutin accumulation was significantly decreased in NtMYB4 overexpressing transgenic plants and NtCHS1 RNAi silenced transgenic plants. Moreover, high H2O2 andO 2 - contents were detected in both types of rutin-reduced transgenic plants under high salt stress. In addition, exogenous rutin supplementation effectively scavenged ROS (H2O2 andO 2 - ) and improved the salt tolerance of the rutin-reduced transgenic plants. In contrast, NtCHS1 overexpressing plants had increased rutin accumulation, lower H2O2 andO 2 - contents, and higher tolerance to salinity. These results suggested that tobacco NtMYB4 acts as a salinity response repressor and negatively regulates NtCHS1 expression, which results in the reduced flavonoid accumulation and weakened ROS-scavenging ability under salt stress.
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Affiliation(s)
- Shuai Chen
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Fengyan Wu
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Yiting Li
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Yanli Qian
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Xuhao Pan
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Fengxia Li
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Yuanying Wang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Zhenying Wu
- Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China
| | - Chunxiang Fu
- Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China
| | - Hao Lin
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Aiguo Yang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
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22
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Zhao K, Lin F, Romero-Gamboa SP, Saha P, Goh HJ, An G, Jung KH, Hazen SP, Bartley LE. Rice Genome-Scale Network Integration Reveals Transcriptional Regulators of Grass Cell Wall Synthesis. FRONTIERS IN PLANT SCIENCE 2019; 10:1275. [PMID: 31681374 PMCID: PMC6813959 DOI: 10.3389/fpls.2019.01275] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 09/12/2019] [Indexed: 05/07/2023]
Abstract
Grasses have evolved distinct cell wall composition and patterning relative to dicotyledonous plants. However, despite the importance of this plant family, transcriptional regulation of its cell wall biosynthesis is poorly understood. To identify grass cell wall-associated transcription factors, we constructed the Rice Combined mutual Ranked Network (RCRN). The RCRN covers >90% of annotated rice (Oryza sativa) genes, is high quality, and includes most grass-specific cell wall genes, such as mixed-linkage glucan synthases and hydroxycinnamoyl acyltransferases. Comparing the RCRN and an equivalent Arabidopsis network suggests that grass orthologs of most genetically verified eudicot cell wall regulators also control this process in grasses, but some transcription factors vary significantly in network connectivity between these divergent species. Reverse genetics, yeast-one-hybrid, and protoplast-based assays reveal that OsMYB61a activates a grass-specific acyltransferase promoter, which confirms network predictions and supports grass-specific cell wall synthesis genes being incorporated into conserved regulatory circuits. In addition, 10 of 15 tested transcription factors, including six novel Wall-Associated regulators (WAP1, WACH1, WAHL1, WADH1, OsMYB13a, and OsMYB13b), alter abundance of cell wall-related transcripts when transiently expressed. The results highlight the quality of the RCRN for examining rice biology, provide insight into the evolution of cell wall regulation, and identify network nodes and edges that are possible leads for improving cell wall composition.
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Affiliation(s)
- Kangmei Zhao
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, United States
| | - Fan Lin
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, United States
| | | | - Prasenjit Saha
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, United States
| | - Hyung-Jung Goh
- Graduate School of Biotechnology & Crop Biotech Institute, Kyung Hee University, Yongin, South Korea
| | - Gynheung An
- Graduate School of Biotechnology & Crop Biotech Institute, Kyung Hee University, Yongin, South Korea
| | - Ki-Hong Jung
- Graduate School of Biotechnology & Crop Biotech Institute, Kyung Hee University, Yongin, South Korea
| | - Samuel P. Hazen
- Department of Biology, University of Massachusetts, Amherst, MA, United States
| | - Laura E. Bartley
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, United States
- *Correspondence: Laura E. Bartley,
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23
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Expression profile analysis of maize in response to Setosphaeria turcica. Gene 2018; 659:100-108. [DOI: 10.1016/j.gene.2018.03.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 02/27/2018] [Accepted: 03/12/2018] [Indexed: 01/04/2023]
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24
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Hernández-Altamirano JM, Largo-Gosens A, Martínez-Rubio R, Pereda D, Álvarez JM, Acebes JL, Encina A, García-Angulo P. Effect of ancymidol on cell wall metabolism in growing maize cells. PLANTA 2018; 247:987-999. [PMID: 29330614 DOI: 10.1007/s00425-018-2840-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 01/02/2018] [Indexed: 06/07/2023]
Abstract
Ancymidol inhibits the incorporation of cellulose into cell walls of maize cell cultures in a gibberellin-independent manner, impairing cell growth; the reduction in the cellulose content is compensated with xylans. Ancymidol is a plant growth retardant which impairs gibberellin biosynthesis. It has been reported to inhibit cellulose synthesis by tobacco cells, based on its cell-malforming effects. To ascertain the putative role of ancymidol as a cellulose biosynthesis inhibitor, we conducted a biochemical study of its effect on cell growth and cell wall metabolism in maize cultured cells. Ancymidol concentrations ≤ 500 µM progressively reduced cell growth and induced globular cell shape without affecting cell viability. However, cell growth and viability were strongly reduced by ancymidol concentrations ≥ 1.5 mM. The I50 value for the effect of ancymidol on FW gain was 658 µM. A reversal of the inhibitory effects on cell growth was observed when 500 µM ancymidol-treated cultures were supplemented with 100 µM GA3. Ancymidol impaired the accumulation of cellulose in cell walls, as monitored by FTIR spectroscopy. Cells treated with 500 µM ancymidol showed a ~ 60% reduction in cellulose content, with no further change as the ancymidol concentration increased. Cellulose content was partially restored by 100 µM GA3. Radiolabeling experiments confirmed that ancymidol reduced the incorporation of [14C]glucose into α-cellulose and this reduction was not reverted by the simultaneous application of GA3. RT-PCR analysis indicated that the cellulose biosynthesis inhibition caused by ancymidol is not related to a downregulation of ZmCesA gene expression. Additionally, ancymidol treatment increased the incorporation of [3H]arabinose into a hemicellulose-enriched fraction, and up-regulated ZmIRX9 and ZmIRX10L gene expression, indicating an enhancement in the biosynthesis of arabinoxylans as a compensatory response to cellulose reduction.
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Affiliation(s)
- J Mabel Hernández-Altamirano
- Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Universidad de León, 24071, León, Spain
| | - Asier Largo-Gosens
- Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Universidad de León, 24071, León, Spain
- Centro de Biotecnología Vegetal, Facultad de Ciencias Biológicas, Universidad Nacional Andrés Bello, 8370146, Santiago, Chile
| | - Romina Martínez-Rubio
- Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Universidad de León, 24071, León, Spain
| | - Diego Pereda
- Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Universidad de León, 24071, León, Spain
| | - Jesús M Álvarez
- Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Universidad de León, 24071, León, Spain
| | - José L Acebes
- Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Universidad de León, 24071, León, Spain.
| | - Antonio Encina
- Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Universidad de León, 24071, León, Spain
| | - Penélope García-Angulo
- Departamento de Ingeniería y Ciencias Agrarias, Área de Fisiología Vegetal, Universidad de León, 24071, León, Spain
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25
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Anwar M, Wang G, Wu J, Waheed S, Allan AC, Zeng L. Ectopic Overexpression of a Novel R2R3-MYB, NtMYB2 from Chinese Narcissus Represses Anthocyanin Biosynthesis in Tobacco. Molecules 2018; 23:E781. [PMID: 29597321 PMCID: PMC6017421 DOI: 10.3390/molecules23040781] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 03/21/2018] [Accepted: 03/23/2018] [Indexed: 11/16/2022] Open
Abstract
R2R3 MYB transcription factors play key functions in the regulation of secondary metabolites. In the present study, a R2R3 MYB transcriptional factor NtMYB2 was identified from Chinese narcissus (Narcissus tazetta L. var. Chinensis Roem) and functionally characterized. NtMYB2 belongs to subgroup 4 of the R2R3 MYB transcription factor family that are related to repressor MYBs involved in the regulation of anthocyanin and flavonoids. Transient expression confirmed that NtMYB2 strongly reduced the red pigmentation induced by MYB- anthocyanin activators in agro-infiltrated tobacco leaves. Ectopic expression of NtMYB2 in tobacco significantly reduced the pigmentation and altered the floral phenotypes in transgenic tobacco flowers. Gene expression analysis suggested that NtMYB2 repressed the transcript levels of structural genes involved in anthocyanin biosynthesis pathway, especially the UFGT gene. NtMYB2 gene is expressed in all examined narcissus tissues; the levels of transcription in petals and corona is higher than other tissues and the transcription level at the bud stage was highest. These results show that NtMYB2 is involved in the regulation of anthocyanin biosynthesis pathway and may act as a repressor by down regulating the transcripts of key enzyme genes in Chinese narcissus.
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Affiliation(s)
- Muhammad Anwar
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
| | - Guiqing Wang
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
| | - Jiacheng Wu
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
| | - Saquib Waheed
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
| | - Andrew C Allan
- The New Zealand Institute for Plant & Food Research, Mt Albert Research Centre, Private Bag 92169, 1142 Auckland, New Zealand.
- School of Biological Sciences, University of Auckland, Private Bag 92019, 1142 Auckland, New Zealand.
| | - Lihui Zeng
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 35002, China.
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26
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Rao X, Dixon RA. Current Models for Transcriptional Regulation of Secondary Cell Wall Biosynthesis in Grasses. FRONTIERS IN PLANT SCIENCE 2018; 9:399. [PMID: 29670638 PMCID: PMC5893761 DOI: 10.3389/fpls.2018.00399] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Accepted: 03/13/2018] [Indexed: 05/17/2023]
Abstract
Secondary cell walls mediate many crucial biological processes in plants including mechanical support, water and nutrient transport and stress management. They also provide an abundant resource of renewable feed, fiber, and fuel. The grass family contains the most important food, forage, and biofuel crops. Understanding the regulatory mechanism of secondary wall formation in grasses is necessary for exploiting these plants for agriculture and industry. Previous research has established a detailed model of the secondary wall regulatory network in the dicot model species Arabidopsis thaliana. Grasses, branching off from the dicot ancestor 140-150 million years ago, display distinct cell wall morphology and composition, suggesting potential for a different secondary wall regulation program from that established for dicots. Recently, combined application of molecular, genetic and bioinformatics approaches have revealed more transcription factors involved in secondary cell wall biosynthesis in grasses. Compared with the dicots, grasses exhibit a relatively conserved but nevertheless divergent transcriptional regulatory program to activate their secondary cell wall development and to coordinate secondary wall biosynthesis with other physiological processes.
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Affiliation(s)
- Xiaolan Rao
- BioDiscovery Institute and Department of Biological Sciences, University of North Texas, Denton, TX, United States
- BioEnergy Science Center, United States Department of Energy, Oak Ridge, TN, United States
- *Correspondence: Xiaolan Rao,
| | - Richard A. Dixon
- BioDiscovery Institute and Department of Biological Sciences, University of North Texas, Denton, TX, United States
- BioEnergy Science Center, United States Department of Energy, Oak Ridge, TN, United States
- Center for Bioenergy Innovation, United States Department of Energy, Oak Ridge, TN, United States
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27
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Wei Q, Zhang F, Sun F, Luo Q, Wang R, Hu R, Chen M, Chang J, Yang G, He G. A wheat MYB transcriptional repressor TaMyb1D regulates phenylpropanoid metabolism and enhances tolerance to drought and oxidative stresses in transgenic tobacco plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2017; 265:112-123. [PMID: 29223332 DOI: 10.1016/j.plantsci.2017.09.020] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 09/15/2017] [Accepted: 09/29/2017] [Indexed: 05/24/2023]
Abstract
MYB transcription factors are involved in the regulation of plant development and response to biotic and abiotic stress. In this study, TaMyb1D, a novel subgroup 4 gene of the R2R3-MYB subfamily, was cloned from wheat (Triticum aestivum L.). TaMyb1D was localized in the nucleus and functioned as a transcriptional repressor. The overexpression of TaMyb1D in tobacco (Nicotiana tabacum) plants repressed the expression of genes related to phenylpropanoid metabolism and down-regulated the accumulation of lignin in stems and flavonoids in leaves. These changes affected plant development under normal conditions. The expression of TaMyb1D was ubiquitous and up-regulated by PEG6000 and H2O2 treatments in wheat. TaMyb1D-overexpressing transgenic tobacco plants exhibited higher relative water content and lower water loss rate during drought stress, as well as higher chlorophyll content in leaves during oxidative stress. The transgenic plants showed a lower leakage of ions as well as reduced malondialdehyde and H2O2 levels during conditions of drought and oxidative stresses. In addition, TaMyb1D up-regulated the expression levels of ROS- and stress-related genes in response to drought stress. Therefore, the overexpression of TaMyb1D enhanced tolerance to drought and oxidative stresses in tobacco plants. Our study demonstrates that TaMyb1D functions as a negative regulator of phenylpropanoid metabolism and a positive regulator of plant tolerance to drought and oxidative stresses.
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Affiliation(s)
- Qiuhui Wei
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Fan Zhang
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Fusheng Sun
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Qingchen Luo
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Ruibin Wang
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Rui Hu
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Mingjie Chen
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Junli Chang
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Guangxiao Yang
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Guangyuan He
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.
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28
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Li R, Reddy VA, Jin J, Rajan C, Wang Q, Yue G, Lim CH, Chua NH, Ye J, Sarojam R. Comparative transcriptome analysis of oil palm flowers reveals an EAR-motif-containing R2R3-MYB that modulates phenylpropene biosynthesis. BMC PLANT BIOLOGY 2017; 17:219. [PMID: 29169327 PMCID: PMC5701422 DOI: 10.1186/s12870-017-1174-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 11/13/2017] [Indexed: 05/14/2023]
Abstract
BACKGROUND Oil palm is the most productive oil crop and the efficiency of pollination has a direct impact on the yield of oil. Pollination by wind can occur but maximal pollination is mediated by the weevil E. kamerunicus. These weevils complete their life cycle by feeding on male flowers. Attraction of weevils to oil palm flowers is due to the emission of methylchavicol by both male and female flowers. In search for male flowers, the weevils visit female flowers by accident due to methylchavicol fragrance and deposit pollen. Given the importance of methylchavicol emission on pollination, we performed comparative transcriptome analysis of oil palm flowers and leaves to identify candidate genes involved in methylchavicol production in flowers. RESULTS RNA sequencing (RNA-Seq) of male open flowers, female open flowers and leaves was performed using Illumina HiSeq 2000 platform. Analysis of the transcriptome data revealed that the transcripts of methylchavicol biosynthesis genes were strongly up-regulated whereas transcripts encoding genes involved in lignin production such as, caffeic acid O-methyltransferase (COMT) and Ferulate-5-hydroxylase (F5H) were found to be suppressed in oil palm flowers. Among the transcripts encoding transcription factors, an EAR-motif-containing R2R3-MYB transcription factor (EgMYB4) was found to be enriched in oil palm flowers. We determined that EgMYB4 can suppress the expression of a monolignol pathway gene, EgCOMT, in vivo by binding to the AC elements present in the promoter region. EgMYB4 was further functionally characterized in sweet basil which also produces phenylpropenes like oil palm. Transgenic sweet basil plants showed significant reduction in lignin content but produced more phenylpropenes. CONCLUSIONS Our results suggest that EgMYB4 possibly restrains lignin biosynthesis in oil palm flowers thus allowing enhanced carbon flux into the phenylpropene pathway. This study augments our understanding of the diverse roles that EAR-motif-containing MYBs play to fine tune the metabolic flux along the various branches of core phenylpropanoid pathway. This will aid in metabolic engineering of plant aromatic compounds.
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Affiliation(s)
- Ran Li
- Temasek Life Sciences Laboratory, National University of Singapore, Singapore, 117604 Singapore
- Present Address: Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, 07745 Jena, Germany
| | - Vaishnavi Amarr Reddy
- Temasek Life Sciences Laboratory, National University of Singapore, Singapore, 117604 Singapore
- Department of Biological Sciences, National University of Singapore, Singapore, 117543 Singapore
| | - Jingjing Jin
- Temasek Life Sciences Laboratory, National University of Singapore, Singapore, 117604 Singapore
| | - Chakaravarthy Rajan
- Temasek Life Sciences Laboratory, National University of Singapore, Singapore, 117604 Singapore
- Present Address: Singapore Centre on Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Qian Wang
- Temasek Life Sciences Laboratory, National University of Singapore, Singapore, 117604 Singapore
- Present Address: College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo, Zhejiang, China
| | - Genhua Yue
- Temasek Life Sciences Laboratory, National University of Singapore, Singapore, 117604 Singapore
| | - Chin Huat Lim
- R&D Department, Wilmar International Plantation, Palembang, Indonesia
| | - Nam-Hai Chua
- Laboratory of Plant Molecular Biology, Rockefeller University, New York, NY 10065 USA
| | - Jian Ye
- Temasek Life Sciences Laboratory, National University of Singapore, Singapore, 117604 Singapore
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101 China
| | - Rajani Sarojam
- Temasek Life Sciences Laboratory, National University of Singapore, Singapore, 117604 Singapore
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Bhatia R, Gallagher JA, Gomez LD, Bosch M. Genetic engineering of grass cell wall polysaccharides for biorefining. PLANT BIOTECHNOLOGY JOURNAL 2017; 15:1071-1092. [PMID: 28557198 PMCID: PMC5552484 DOI: 10.1111/pbi.12764] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 05/17/2017] [Accepted: 05/24/2017] [Indexed: 05/10/2023]
Abstract
Grasses represent an abundant and widespread source of lignocellulosic biomass, which has yet to fulfil its potential as a feedstock for biorefining into renewable and sustainable biofuels and commodity chemicals. The inherent recalcitrance of lignocellulosic materials to deconstruction is the most crucial limitation for the commercial viability and economic feasibility of biomass biorefining. Over the last decade, the targeted genetic engineering of grasses has become more proficient, enabling rational approaches to modify lignocellulose with the aim of making it more amenable to bioconversion. In this review, we provide an overview of transgenic strategies and targets to tailor grass cell wall polysaccharides for biorefining applications. The bioengineering efforts and opportunities summarized here rely primarily on (A) reprogramming gene regulatory networks responsible for the biosynthesis of lignocellulose, (B) remodelling the chemical structure and substitution patterns of cell wall polysaccharides and (C) expressing lignocellulose degrading and/or modifying enzymes in planta. It is anticipated that outputs from the rational engineering of grass cell wall polysaccharides by such strategies could help in realizing an economically sustainable, grass-derived lignocellulose processing industry.
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Affiliation(s)
- Rakesh Bhatia
- Institute of Biological, Environmental and Rural Sciences (IBERS)Aberystwyth UniversityAberystwythUK
| | - Joe A. Gallagher
- Institute of Biological, Environmental and Rural Sciences (IBERS)Aberystwyth UniversityAberystwythUK
| | | | - Maurice Bosch
- Institute of Biological, Environmental and Rural Sciences (IBERS)Aberystwyth UniversityAberystwythUK
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Li M, Li Y, Guo L, Gong N, Pang Y, Jiang W, Liu Y, Jiang X, Zhao L, Wang Y, Xie DY, Gao L, Xia T. Functional Characterization of Tea ( Camellia sinensis) MYB4a Transcription Factor Using an Integrative Approach. FRONTIERS IN PLANT SCIENCE 2017; 8:943. [PMID: 28659938 PMCID: PMC5467005 DOI: 10.3389/fpls.2017.00943] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 05/22/2017] [Indexed: 05/18/2023]
Abstract
Green tea (Camellia sinensis, Cs) abundantly produces a diverse array of phenylpropanoid compounds benefiting human health. To date, the regulation of the phenylpropanoid biosynthesis in tea remains to be investigated. Here, we report a cDNA isolated from leaf tissues, which encodes a R2R3-MYB transcription factor. Amino acid sequence alignment and phylogenetic analysis indicate that it is a member of the MYB4-subgroup and named as CsMYB4a. Transcriptional and metabolic analyses show that the expression profile of CsMYB4a is negatively correlated to the accumulation of six flavan-3-ols and other phenolic acids. GFP fusion analysis shows CsMYB4a's localization in the nucleus. Promoters of five tea phenylpropanoid pathway genes are isolated and characterized to contain four types of AC-elements, which are targets of MYB4 members. Interaction of CsMYB4a and five promoters shows that CsMYB4a decreases all five promoters' activity. To further characterize its function, CsMYB4a is overexpressed in tobacco plants. The resulting transgenic plants show dwarf, shrinking and yellowish leaf, and early senescence phenotypes. A further genome-wide transcriptomic analysis reveals that the expression levels of 20 tobacco genes involved in the shikimate and the phenylpropanoid pathways are significantly downregulated in transgenic tobacco plants. UPLC-MS and HPLC based metabolic profiling reveals significant reduction of total lignin content, rutin, chlorogenic acid, and phenylalanine in CsMYB4a transgenic tobacco plants. Promoter sequence analysis of the 20 tobacco genes characterizes four types of AC-elements. Further CsMYB4a-AC element and CsMYB4a-promoter interaction analyses indicate that the negative regulation of CsMYB4a on the shikimate and phenylpropanoid pathways in tobacco is via reducing promoter activity. Taken together, all data indicate that CsMYB4a negatively regulates the phenylpropanoid and shikimate pathways. Highlight: A tea (Camellia sinensis) MYB4a is characterized to encode a R2R3-MYB transcription factor. It is shown to repressively control the phenylpropanoid and shikimate pathway.
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Affiliation(s)
- Mingzhuo Li
- State Key Laboratory of Tea Plant Biochemistry and Utilization, Anhui Agricultural UniversityHefei, China
| | - Yanzhi Li
- State Key Laboratory of Tea Plant Biochemistry and Utilization, Anhui Agricultural UniversityHefei, China
| | - Lili Guo
- School of Life Science, Anhui Agricultural UniversityHefei, China
| | - Niandi Gong
- School of Life Science, Anhui Agricultural UniversityHefei, China
| | - Yongzheng Pang
- Institute of Botany, Chinese Academy of SciencesBeijing, China
| | - Wenbo Jiang
- Institute of Botany, Chinese Academy of SciencesBeijing, China
| | - Yajun Liu
- School of Life Science, Anhui Agricultural UniversityHefei, China
| | - Xiaolan Jiang
- State Key Laboratory of Tea Plant Biochemistry and Utilization, Anhui Agricultural UniversityHefei, China
| | - Lei Zhao
- College of Horticulture, Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticultural Plants, Qingdao Agricultural UniversityQingdao, China
| | - Yunsheng Wang
- School of Life Science, Anhui Agricultural UniversityHefei, China
| | - De-Yu Xie
- State Key Laboratory of Tea Plant Biochemistry and Utilization, Anhui Agricultural UniversityHefei, China
- Department of Plant and Microbial Biology, North Carolina State University, RaleighNC, United States
- *Correspondence: Tao Xia, Liping Gao, De-Yu Xie,
| | - Liping Gao
- School of Life Science, Anhui Agricultural UniversityHefei, China
- *Correspondence: Tao Xia, Liping Gao, De-Yu Xie,
| | - Tao Xia
- State Key Laboratory of Tea Plant Biochemistry and Utilization, Anhui Agricultural UniversityHefei, China
- *Correspondence: Tao Xia, Liping Gao, De-Yu Xie,
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Lei YX, Zhang Y, Li YY, Lai JJ, Gao G, Zhang HQ, Zhou YH, Yang RW. Cloning and molecular characterization of Myb transcription factors from Leymus (Poaceae: Trticeae). Biologia (Bratisl) 2016. [DOI: 10.1515/biolog-2016-0134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Transcriptome Analysis of Ceriops tagal in Saline Environments Using RNA-Sequencing. PLoS One 2016; 11:e0167551. [PMID: 27936168 PMCID: PMC5147905 DOI: 10.1371/journal.pone.0167551] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 11/16/2016] [Indexed: 12/01/2022] Open
Abstract
Identification of genes involved in mangrove species’ adaptation to salt stress can provide valuable information for developing salt-tolerant crops and understanding the molecular evolution of salt tolerance in halophiles. Ceriops tagal is a salt-tolerant mangrove tree growing in mudflats and marshes in tropical and subtropical areas, without any prior genome information. In this study, we assessed the biochemical and transcriptional responses of C. tagal to high salt treatment (500 mmol/L NaCl) by hydroponic experiments and RNA-seq. In C. tagal root tissues under salt stress, proline accumulated strongly from 3 to 12 h of treatment; meanwhile, malondialdehyde content progressively increased from 0 to 9 h, then dropped to lower than control levels by 24 h. These implied that C. tagal plants could survive salt stress through biochemical modification. Using the Illumina sequencing platform, approximately 27.39 million RNA-seq reads were obtained from three salt-treated and control (untreated) root samples. These reads were assembled into 47,111 transcripts with an average length of 514 bp and an N50 of 632 bp. Approximately 78% of the transcripts were annotated, and a total of 437 genes were putative transcription factors. Digital gene expression analysis was conducted by comparing transcripts from the untreated control to the three salt treated samples, and 7,330 differentially expressed transcripts were identified. Using k-means clustering, these transcripts were divided into six clusters that differed in their expression patterns across four treatment time points. The genes identified as being up- or downregulated are involved in salt stress responses, signal transduction, and DNA repair. Our study shows the main adaptive pathway of C. tagal in saline environments, under short-term and long-term treatments of salt stress. This provides vital clues as to which genes may be candidates for breeding salt-tolerant crops and clarifying molecular mechanisms of salt tolerance in C. tagal. The expression levels of 20 candidate genes measured by RNA-Seq were validated via qRT-PCR. Eighteen genes showed consistent expression patterns in RNA-Seq and qRT-PCR results, suggesting that the RNA-seq dataset was dependable for gene expression pattern analysis.
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Chezem WR, Clay NK. Regulation of plant secondary metabolism and associated specialized cell development by MYBs and bHLHs. PHYTOCHEMISTRY 2016; 131:26-43. [PMID: 27569707 PMCID: PMC5048601 DOI: 10.1016/j.phytochem.2016.08.006] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2015] [Revised: 08/10/2016] [Accepted: 08/15/2016] [Indexed: 05/20/2023]
Abstract
Plants are unrivaled in the natural world in both the number and complexity of secondary metabolites they produce, and the ubiquitous phenylpropanoids and the lineage-specific glucosinolates represent two such large and chemically diverse groups. Advances in genome-enabled biochemistry and metabolomic technologies have greatly increased the understanding of their metabolic networks in diverse plant species. There also has been some progress in elucidating the gene regulatory networks that are key to their synthesis, accumulation and function. This review highlights what is currently known about the gene regulatory networks and the stable sub-networks of transcription factors at their cores that regulate the production of these plant secondary metabolites and the differentiation of specialized cell types that are equally important to their defensive function. Remarkably, some of these core components are evolutionarily conserved between secondary metabolism and specialized cell development and across distantly related plant species. These findings suggest that the more ancient gene regulatory networks for the differentiation of fundamental cell types may have been recruited and remodeled for the generation of the vast majority of plant secondary metabolites and their specialized tissues.
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Affiliation(s)
- William R Chezem
- Department of Molecular, Cellular & Developmental Biology, Yale University, New Haven, CT, USA.
| | - Nicole K Clay
- Department of Molecular, Cellular & Developmental Biology, Yale University, New Haven, CT, USA.
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Poovaiah CR, Bewg WP, Lan W, Ralph J, Coleman HD. Sugarcane transgenics expressing MYB transcription factors show improved glucose release. BIOTECHNOLOGY FOR BIOFUELS 2016; 9:143. [PMID: 27429646 PMCID: PMC4946106 DOI: 10.1186/s13068-016-0559-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 06/30/2016] [Indexed: 05/18/2023]
Abstract
BACKGROUND Sugarcane, a tropical C4 perennial crop, is capable of producing 30-100 tons or more of biomass per hectare annually. The lignocellulosic residue remaining after sugar extraction is currently underutilized and can provide a significant source of biomass for the production of second-generation bioethanol. RESULTS MYB31 and MYB42 were cloned from maize and expressed in sugarcane with and without the UTR sequences. The cloned sequences were 98 and 99 % identical to the published nucleotide sequences. The inclusion of the UTR sequences did not affect any of the parameters tested. There was little difference in plant height and the number of internodes of the MYB-overexpressing sugarcane plants when compared with controls. MYB transgene expression determined by qPCR exhibited continued expression in young and maturing internodes. MYB31 downregulated more genes within the lignin biosynthetic pathway than MYB42. MYB31 and MYB42 expression resulted in decreased lignin content in some lines. All MYB42 plants further analyzed showed significant increases in glucose release by enzymatic hydrolysis in 72 h, whereas only two MYB31 plants released more glucose than control plants. This correlated directly with a significant decrease in acid-insoluble lignin. Soluble sucrose content of the MYB42 transgenic plants did not vary compared to control plants. CONCLUSIONS This study demonstrates the use of MYB transcription factors to improve the production of bioethanol from sugarcane bagasse remaining after sugar extraction.
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Affiliation(s)
| | - William P. Bewg
- />Center for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, QLD 4000 Australia
| | - Wu Lan
- />US Department of Energy, Great Lakes Bioenergy Research Center (GLBRC), Wisconsin Energy Institute, University of Wisconsin, Madison, WI 53726 USA
- />Department of Biological System Engineering, University of Wisconsin, Madison, WI USA
| | - John Ralph
- />US Department of Energy, Great Lakes Bioenergy Research Center (GLBRC), Wisconsin Energy Institute, University of Wisconsin, Madison, WI 53726 USA
- />Department of Biochemistry, University of Wisconsin, Madison, WI 53726 USA
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Wu X, Li Y, Shi Y, Song Y, Zhang D, Li C, Buckler ES, Li Y, Zhang Z, Wang T. Joint-linkage mapping and GWAS reveal extensive genetic loci that regulate male inflorescence size in maize. PLANT BIOTECHNOLOGY JOURNAL 2016; 14:1551-62. [PMID: 26801971 PMCID: PMC5066742 DOI: 10.1111/pbi.12519] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 10/31/2015] [Accepted: 11/22/2015] [Indexed: 05/18/2023]
Abstract
Both insufficient and excessive male inflorescence size leads to a reduction in maize yield. Knowledge of the genetic architecture of male inflorescence is essential to achieve the optimum inflorescence size for maize breeding. In this study, we used approximately eight thousand inbreds, including both linkage populations and association populations, to dissect the genetic architecture of male inflorescence. The linkage populations include 25 families developed in the U.S. and 11 families developed in China. Each family contains approximately 200 recombinant inbred lines (RILs). The association populations include approximately 1000 diverse lines from the U.S. and China. All inbreds were genotyped by either sequencing or microarray. Inflorescence size was measured as the tassel primary branch number (TBN) and tassel length (TL). A total of 125 quantitative trait loci (QTLs) were identified (63 for TBN, 62 for TL) through linkage analyses. In addition, 965 quantitative trait nucleotides (QTNs) were identified through genomewide study (GWAS) at a bootstrap posterior probability (BPP) above a 5% threshold. These QTLs/QTNs include 24 known genes that were cloned using mutants, for example Ramosa3 (ra3), Thick tassel dwarf1 (td1), tasselseed2 (ts2), liguleless2 (lg2), ramosa1 (ra1), barren stalk1 (ba1), branch silkless1 (bd1) and tasselseed6 (ts6). The newly identified genes encode a zinc transporter (e.g. GRMZM5G838098 and GRMZM2G047762), the adapt in terminal region protein (e.g. GRMZM5G885628), O-methyl-transferase (e.g. GRMZM2G147491), helix-loop-helix (HLH) DNA-binding proteins (e.g. GRMZM2G414252 and GRMZM2G042895) and an SBP-box protein (e.g. GRMZM2G058588). These results provide extensive genetic information to dissect the genetic architecture of inflorescence size for the improvement of maize yield.
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Affiliation(s)
- Xun Wu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
- Nanchong Academy of Agricultural Sciences, Nanchong, Sichuan, China
| | - Yongxiang Li
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yunsu Shi
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yanchun Song
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dengfeng Zhang
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Chunhui Li
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Edward S Buckler
- Institute for Genomic Diversity, Cornell University, Ithaca, NY, USA
- USA Department of Agriculture-Agricultural Research Service, Ithaca, NY, USA
| | - Yu Li
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Zhiwu Zhang
- Department of Agronomy, Northeast Agricultural University, Harbin, Heilongjiang, China
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
| | - Tianyu Wang
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
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MYB31/MYB42 Syntelogs Exhibit Divergent Regulation of Phenylpropanoid Genes in Maize, Sorghum and Rice. Sci Rep 2016; 6:28502. [PMID: 27328708 PMCID: PMC4916418 DOI: 10.1038/srep28502] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Accepted: 05/19/2016] [Indexed: 12/27/2022] Open
Abstract
ZmMYB31 and ZmMYB42 are R2R3-MYB transcription factors implicated in the regulation of phenylpropanoid genes in maize. Here, we tested the hypothesis that the regulatory function of MYB31 and MYB42 is conserved in other monocots, specifically in sorghum and rice. We demonstrate that syntelogs of MYB31 and MYB42 do bind to phenylpropanoid genes that function in all stages of the pathway and in different tissues along the developmental gradient of seedling leaves. We found that caffeic acid O-methyltransferase (COMT1) is a common target of MYB31 and MYB42 in the mature leaf tissues of maize, sorghum and rice, as evidenced by Chromatin immunoprecipitation (ChIP) experiments. In contrast, 4-coumarate-CoA ligase (4CL2), ferulate-5-hydroxylase (F5H), and caffeoyl shikimate esterase (CSE), were targeted by MYB31 or MYB42, but in a more species-specific fashion. Our results revealed MYB31 and MYB42 participation in auto- and cross-regulation in all three species. Apart from a limited conservation of regulatory modules, MYB31 and MYB42 syntelogs appear to have undergone subfunctionalization following gene duplication and divergence of maize, sorghum, and rice. Elucidating the different regulatory roles of these syntelogs in the context of positive transcriptional activators may help guide attempts to alter the flux of intermediates towards lignin production in biofuel grasses.
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Alcântara BK, Machemer-Noonan K, Silva Júnior FG, Azevedo RA. Dry Priming of Maize Seeds Reduces Aluminum Stress. PLoS One 2015; 10:e0145742. [PMID: 26714286 PMCID: PMC4694655 DOI: 10.1371/journal.pone.0145742] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 12/08/2015] [Indexed: 12/05/2022] Open
Abstract
Aluminum (Al) toxicity is directly related to acidic soils and substantially limits maize yield. Earlier studies using hormones and other substances to treat the seeds of various crops have been carried out with the aim of inducing tolerance to abiotic stress, especially chilling, drought and salinity. However, more studies regarding the effects of seed treatments on the induction of Al tolerance are necessary. In this study, two independent experiments were performed to determine the effect of ascorbic acid (AsA) seed treatment on the tolerance response of maize to acidic soil and Al stress. In the first experiment (greenhouse), the AsA seed treatment was tested in B73 (Al-sensitive genotype). This study demonstrates the potential of AsA for use as a pre-sowing seed treatment (seed priming) because this metabolite increased root and shoot growth under acidic and Al stress conditions. In the second test, the evidence from field experiments using an Al-sensitive genotype (Mo17) and an Al-tolerant genotype (DA) suggested that prior AsA seed treatment increased the growth of both genotypes. Enhanced productivity was observed for DA under Al stress after priming the seeds. Furthermore, the AsA treatment decreased the activity of oxidative stress-related enzymes in the DA genotype. In this study, remarkable effects using AsA seed treatment in maize were observed, demonstrating the potential future use of AsA in seed priming.
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Affiliation(s)
- Berenice Kussumoto Alcântara
- Departamento de Genética, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, São Paulo, Brasil
| | - Katja Machemer-Noonan
- Center for Applied Plant Sciences, Rightmire Hall, The Ohio State University, Columbus, Ohio, United States of America
| | - Francides Gomes Silva Júnior
- Departamento de Ciências Florestais, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, São Paulo, Brasil
| | - Ricardo Antunes Azevedo
- Departamento de Genética, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, São Paulo, Brasil
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Yoon J, Choi H, An G. Roles of lignin biosynthesis and regulatory genes in plant development. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2015; 57:902-12. [PMID: 26297385 PMCID: PMC5111759 DOI: 10.1111/jipb.12422] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2015] [Accepted: 08/19/2015] [Indexed: 05/02/2023]
Abstract
Lignin is an important factor affecting agricultural traits, biofuel production, and the pulping industry. Most lignin biosynthesis genes and their regulatory genes are expressed mainly in the vascular bundles of stems and leaves, preferentially in tissues undergoing lignification. Other genes are poorly expressed during normal stages of development, but are strongly induced by abiotic or biotic stresses. Some are expressed in non-lignifying tissues such as the shoot apical meristem. Alterations in lignin levels affect plant development. Suppression of lignin biosynthesis genes causes abnormal phenotypes such as collapsed xylem, bending stems, and growth retardation. The loss of expression by genes that function early in the lignin biosynthesis pathway results in more severe developmental phenotypes when compared with plants that have mutations in later genes. Defective lignin deposition is also associated with phenotypes of seed shattering or brittle culm. MYB and NAC transcriptional factors function as switches, and some homeobox proteins negatively control lignin biosynthesis genes. Ectopic deposition caused by overexpression of lignin biosynthesis genes or master switch genes induces curly leaf formation and dwarfism.
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Affiliation(s)
- Jinmi Yoon
- Crop Biotech InstituteKyung Hee UniversityYongin446‐701Korea
- Department of Life SciencePohang University of Science and TechnologyPohang790‐784Korea
| | - Heebak Choi
- Crop Biotech InstituteKyung Hee UniversityYongin446‐701Korea
- Department of Life SciencePohang University of Science and TechnologyPohang790‐784Korea
| | - Gynheung An
- Crop Biotech InstituteKyung Hee UniversityYongin446‐701Korea
- Graduate School of BiotechnologyKyung Hee UniversityYongin446‐701Korea
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La Rocca N, Manzotti PS, Cavaiuolo M, Barbante A, Dalla Vecchia F, Gabotti D, Gendrot G, Horner DS, Krstajic J, Persico M, Rascio N, Rogowsky P, Scarafoni A, Consonni G. The maize fused leaves1 (fdl1) gene controls organ separation in the embryo and seedling shoot and promotes coleoptile opening. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:5753-67. [PMID: 26093144 PMCID: PMC4566974 DOI: 10.1093/jxb/erv278] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The fdl1-1 mutation, caused by an Enhancer/Suppressor mutator (En/Spm) element insertion located in the third exon of the gene, identifies a novel gene encoding ZmMYB94, a transcription factor of the R2R3-MYB subfamily. The fdl1 gene was isolated through co-segregation analysis, whereas proof of gene identity was obtained using an RNAi strategy that conferred less severe, but clearly recognizable specific mutant traits on seedlings. Fdl1 is involved in the regulation of cuticle deposition in young seedlings as well as in the establishment of a regular pattern of epicuticular wax deposition on the epidermis of young leaves. Lack of Fdl1 action also correlates with developmental defects, such as delayed germination and seedling growth, abnormal coleoptile opening and presence of curly leaves showing areas of fusion between the coleoptile and the first leaf or between the first and the second leaf. The expression profile of ZmMYB94 mRNA-determined by quantitative RT-PCR-overlaps the pattern of mutant phenotypic expression and is confined to a narrow developmental window. High expression was observed in the embryo, in the seedling coleoptile and in the first two leaves, whereas RNA level, as well as phenotypic defects, decreases at the third leaf stage. Interestingly several of the Arabidopsis MYB genes most closely related to ZmMYB94 are also involved in the activation of cuticular wax biosynthesis, suggesting deep conservation of regulatory processes related to cuticular wax deposition between monocots and dicots.
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Affiliation(s)
- Nicoletta La Rocca
- Dipartimento di Biologia, Università degli Studi di Padova, Via Ugo Bassi 58/B, 35131 Padova, Italy
| | - Priscilla S Manzotti
- Dipartimento di Scienze Agrarie e Ambientali (DISAA), Produzione, Territorio, Energia Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
| | - Marina Cavaiuolo
- Dipartimento di Scienze Agrarie e Ambientali (DISAA), Produzione, Territorio, Energia Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
| | - Alessandra Barbante
- Dipartimento di Scienze Agrarie e Ambientali (DISAA), Produzione, Territorio, Energia Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
| | - Francesca Dalla Vecchia
- Dipartimento di Biologia, Università degli Studi di Padova, Via Ugo Bassi 58/B, 35131 Padova, Italy
| | - Damiano Gabotti
- Dipartimento di Scienze Agrarie e Ambientali (DISAA), Produzione, Territorio, Energia Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
| | - Ghislaine Gendrot
- Université de Lyon, ENS de Lyon, INRA, CNRS, Université Lyon 1, Unité Reproduction et Développement des Plantes, F-69364 Lyon, France
| | - David S Horner
- Dipartimento di Biologia, Università degli Studi di Padova, Via Ugo Bassi 58/B, 35131 Padova, Italy
| | - Jelena Krstajic
- Dipartimento di Scienze Agrarie e Ambientali (DISAA), Produzione, Territorio, Energia Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
| | - Martina Persico
- Dipartimento di Scienze Agrarie e Ambientali (DISAA), Produzione, Territorio, Energia Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
| | - Nicoletta Rascio
- Dipartimento di Biologia, Università degli Studi di Padova, Via Ugo Bassi 58/B, 35131 Padova, Italy
| | - Peter Rogowsky
- Université de Lyon, ENS de Lyon, INRA, CNRS, Université Lyon 1, Unité Reproduction et Développement des Plantes, F-69364 Lyon, France
| | - Alessio Scarafoni
- Dipartimento di Biologia, Università degli Studi di Padova, Via Ugo Bassi 58/B, 35131 Padova, Italy Dipartimento di Scienze Agrarie e Ambientali (DISAA), Produzione, Territorio, Energia Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy Université de Lyon, ENS de Lyon, INRA, CNRS, Université Lyon 1, Unité Reproduction et Développement des Plantes, F-69364 Lyon, France Dipartimento di Bioscienze, Università degli Studi di Milano, Via Celoria 26, 20133 Milan, Italy Dipartimento di Scienze per gli Alimenti la Nutrizione, l'Ambiente, Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
| | - Gabriella Consonni
- Dipartimento di Scienze Agrarie e Ambientali (DISAA), Produzione, Territorio, Energia Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
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Hu L, Li H, Chen L, Lou Y, Amombo E, Fu J. RNA-seq for gene identification and transcript profiling in relation to root growth of bermudagrass (Cynodon dactylon) under salinity stress. BMC Genomics 2015; 16:575. [PMID: 26238595 PMCID: PMC4523028 DOI: 10.1186/s12864-015-1799-3] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2014] [Accepted: 07/27/2015] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Soil salinity is one of the most significant abiotic stresses affecting plant shoots and roots growth. The adjustment of root architecture to spatio-temporal heterogeneity in salinity is particularly critical for plant growth and survival. Bermudagrass (Cynodon dactylon) is a widely used turf and forage perennial grass with a high degree of salinity tolerance. Salinity appears to stimulate the growth of roots and decrease their mortality in tolerant bermudagrass. To estimate a broad spectrum of genes related to root elongation affected by salt stress and the molecular mechanisms that control the positive response of root architecture to salinity, we analyzed the transcriptome of bermudagrass root tips in response to salinity. RESULTS RNA-sequencing was performed in root tips of two bermudagrass genotypes contrasting in salt tolerance. A total of 237,850,130 high quality clean reads were generated and 250,359 transcripts were assembled with an average length of 1115 bp. Totally, 103,324 unigenes obtained with 53,765 unigenes (52 %) successfully annotated in databases. Bioinformatics analysis indicated that major transcription factor (TF) families linked to stress responses and growth regulation (MYB, bHLH, WRKY) were differentially expressed in root tips of bermudagrass under salinity. In addition, genes related to cell wall loosening and stiffening (xyloglucan endotransglucosylase/hydrolases, peroxidases) were identified. CONCLUSIONS RNA-seq analysis identified candidate genes encoding TFs involved in the regulation of lignin synthesis, reactive oxygen species (ROS) homeostasis controlled by peroxidases, and the regulation of phytohormone signaling that promote cell wall loosening and therefore root growth under salinity.
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Affiliation(s)
- Longxing Hu
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, Hubei, 430074, PR China.
| | - Huiying Li
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, Hubei, 430074, PR China.
| | - Liang Chen
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, Hubei, 430074, PR China.
| | - Yanhong Lou
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, Hubei, 430074, PR China.
| | - Erick Amombo
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, Hubei, 430074, PR China.
| | - Jinmin Fu
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, Hubei, 430074, PR China.
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Legay S, Guerriero G, Deleruelle A, Lateur M, Evers D, André CM, Hausman JF. Apple russeting as seen through the RNA-seq lens: strong alterations in the exocarp cell wall. PLANT MOLECULAR BIOLOGY 2015; 88:21-40. [PMID: 25786603 DOI: 10.1007/s11103-015-0303-4] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 02/23/2015] [Indexed: 05/06/2023]
Abstract
Russeting, a commercially important defect in the exocarp of apple (Malus × domestica), is mainly characterized by the accumulation of suberin on the inner part of the cell wall of the outer epidermal cell layers. However, knowledge on the underlying genetic components triggering this trait remains sketchy. Bulk transcriptomic profiling was performed on the exocarps of three russeted and three waxy apple varieties. This experimental design was chosen to lower the impact of genotype on the obtained results. Validation by qPCR was carried out on representative genes and additional varieties. Gene ontology enrichment revealed a repression of lignin and cuticle biosynthesis genes in russeted exocarps, concomitantly with an enhanced expression of suberin deposition, stress responsive, primary sensing, NAC and MYB-family transcription factors, and specific triterpene biosynthetic genes. Notably, a strong correlation (R(2) = 0.976) between the expression of a MYB93-like transcription factor and key suberin biosynthetic genes was found. Our results suggest that russeting is induced by a decreased expression of cuticle biosynthetic genes, leading to a stress response which not only affects suberin deposition, but also the entire structure of the cell wall. The large number of candidate genes identified in this study provides a solid foundation for further functional studies.
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Affiliation(s)
- Sylvain Legay
- Plant Cell Wall Integrative Biology, Centre de Recherche Public - Gabriel Lippmann, 41, rue du Brill, Belvaux, L-4422, Luxembourg,
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Mélida H, Largo-Gosens A, Novo-Uzal E, Santiago R, Pomar F, García P, García-Angulo P, Acebes JL, Álvarez J, Encina A. Ectopic lignification in primary cellulose-deficient cell walls of maize cell suspension cultures. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2015; 57:357-72. [PMID: 25735403 DOI: 10.1111/jipb.12346] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 02/25/2015] [Indexed: 05/23/2023]
Abstract
Maize (Zea mays L.) suspension-cultured cells with up to 70% less cellulose were obtained by stepwise habituation to dichlobenil (DCB), a cellulose biosynthesis inhibitor. Cellulose deficiency was accompanied by marked changes in cell wall matrix polysaccharides and phenolics as revealed by Fourier transform infrared (FTIR) spectroscopy. Cell wall compositional analysis indicated that the cellulose-deficient cell walls showed an enhancement of highly branched and cross-linked arabinoxylans, as well as an increased content in ferulic acid, diferulates and p-coumaric acid, and the presence of a polymer that stained positive for phloroglucinol. In accordance with this, cellulose-deficient cell walls showed a fivefold increase in Klason-type lignin. Thioacidolysis/GC-MS analysis of cellulose-deficient cell walls indicated the presence of a lignin-like polymer with a Syringyl/Guaiacyl ratio of 1.45, which differed from the sensu stricto stress-related lignin that arose in response to short-term DCB-treatments. Gene expression analysis of these cells indicated an overexpression of genes specific for the biosynthesis of monolignol units of lignin. A study of stress signaling pathways revealed an overexpression of some of the jasmonate signaling pathway genes, which might trigger ectopic lignification in response to cell wall integrity disruptions. In summary, the structural plasticity of primary cell walls is proven, since a lignification process is possible in response to cellulose impoverishment.
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Affiliation(s)
- Hugo Mélida
- Plant Physiology Laboratory, Faculty of Biological and Environmental Sciences, University of León, E-24071 León, Spain; Centre for Plant Biotechnology and Genomics (CBGP), Politechnical University of Madrid, E-28223 Madrid, Spain
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Ko JH, Jeon HW, Kim WC, Kim JY, Han KH. The MYB46/MYB83-mediated transcriptional regulatory programme is a gatekeeper of secondary wall biosynthesis. ANNALS OF BOTANY 2014; 114:1099-107. [PMID: 24984711 PMCID: PMC4195559 DOI: 10.1093/aob/mcu126] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Accepted: 05/06/2014] [Indexed: 05/17/2023]
Abstract
BACKGROUND The secondary cell wall is a defining feature of xylem cells and allows them to resist both gravitational forces and the tension forces associated with the transpirational pull on their internal columns of water. Secondary walls also constitute the majority of plant biomass. Formation of secondary walls requires co-ordinated transcriptional regulation of the genes involved in the biosynthesis of cellulose, hemicellulose and lignin. This co-ordinated control appears to involve a multifaceted and multilayered transcriptional regulatory programme. SCOPE Transcription factor MYB46 (At5g12870) has been shown to function as a master regulator in secondary wall formation in Arabidopsis thaliana. Recent studies show that MYB46 not only regulates the transcription factors but also the biosynthesis genes for all of the three major components (i.e. cellulose, hemicellulose and lignin) of secondary walls. This review considers our current understanding of the MYB46-mediated transcriptional regulatory network, including upstream regulators, downstream targets and negative regulators of MYB46. CONCLUSIONS AND OUTLOOK MYB46 is a unique transcription factor in that it directly regulates the biosynthesis genes for all of the three major components of the secondary wall as well as the transcription factors in the biosynthesis pathway. As such, MYB46 may offer a useful means for pathway-specific manipulation of secondary wall biosynthesis. However, realization of this potential requires additional information on the 'MYB46-mediated transcriptional regulatory programme', such as downstream direct targets, upstream regulators and interacting partners of MYB46.
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Affiliation(s)
- J-H Ko
- Department of Plant and Environmental New Resources, Kyung Hee University, Yongin-si, Korea
| | - H-W Jeon
- Department of Plant and Environmental New Resources, Kyung Hee University, Yongin-si, Korea
| | - W-C Kim
- Department of Horticulture DOE-Great Lakes Bioenergy Research Center
| | | | - K-H Han
- Department of Horticulture DOE-Great Lakes Bioenergy Research Center Department of Forestry, Michigan State University, East Lansing, MI 48824, USA
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Fornalé S, Lopez E, Salazar-Henao JE, Fernández-Nohales P, Rigau J, Caparros-Ruiz D. AtMYB7, a new player in the regulation of UV-sunscreens in Arabidopsis thaliana. PLANT & CELL PHYSIOLOGY 2014; 55:507-16. [PMID: 24319076 DOI: 10.1093/pcp/pct187] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The phenylpropanoid metabolic pathway provides a wide variety of essential compounds for plants. Together with sinapate esters, in Brassicaceae species, flavonoids play an important role in protecting plants against UV irradiation. In this work we have characterized Arabidopsis thaliana AtMYB7, the closest homolog of AtMYB4 and AtMYB32, described as repressors of different branches of phenylpropanoid metabolism. The characterization of atmyb7 plants revealed an induction of several genes involved in flavonol biosynthesis and an increased amount of these compounds. In addition, AtMYB7 gene expression is repressed by AtMYB4. As a consequence, the atmyb4 mutant plants present a reduction of flavonol contents, indicating once more that AtMYB7 represses flavonol biosynthesis. Our results also show that AtMYB7 gene expression is induced by salt stress. Induction assays indicated that AtMYB7 represses several genes of the flavonoid pathway, DFR and UGT being early targets of this transcription factor. The results obtained indicate that AtMYB7 is a repressor of flavonol biosynthesis and also led us to propose AtMYB4 and AtMYB7 as part of the regulatory mechanism controlling the balance of the main A. thaliana UV-sunscreens.
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Affiliation(s)
- Silvia Fornalé
- Centre for Research in Agricultural Genomics (CRAG), Consorci CSIC-IRTA-UAB-UB Edifici CRAG Campus de Bellaterra de la UAB, 08193 Cerdanyola del Valles, Barcelona, Spain
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Zhang S, Ma P, Yang D, Li W, Liang Z, Liu Y, Liu F. Cloning and characterization of a putative R2R3 MYB transcriptional repressor of the rosmarinic acid biosynthetic pathway from Salvia miltiorrhiza. PLoS One 2013; 8:e73259. [PMID: 24039895 PMCID: PMC3769309 DOI: 10.1371/journal.pone.0073259] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 07/18/2013] [Indexed: 11/19/2022] Open
Abstract
Salvia miltiorrhiza Bunge is one of the most renowned traditional medicinal plants in China. Phenolic acids that are derived from the rosmarinic acid pathway, such as rosmarinic acid and salvianolic acid B, are important bioactive components in S. miltiorrhiza. Accumulations of these compounds have been reported to be induced by various elicitors, while little is known about transcription factors that function in their biosynthetic pathways. We cloned a subgroup 4 R2R3 MYB transcription factor gene (SmMYB39) from S. miltiorrhiza and characterized its roles through overexpression and RNAi-mediated silencing. As the results showed, the content of 4-coumaric acid, rosmarinic acid, salvianolic acid B, salvianolic acid A and total phenolics was dramatically decreased in SmMYB39-overexpressing S. miltiorrhiza lines while being enhanced by folds in SmMYB39-RNAi lines. Quantitative real-time PCR and enzyme activities analyses showed that SmMYB39 negatively regulated transcripts and enzyme activities of 4-hydroxylase (C4H) and tyrosine aminotransferase (TAT). These data suggest that SmMYB39 is involved in regulation of rosmarinic acid pathway and acts as a repressor through suppressing transcripts of key enzyme genes.
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Affiliation(s)
- Shuncang Zhang
- College of Life Sciences, Northwest A & F University, Yangling, People's Republic of China
| | - Pengda Ma
- College of Life Sciences, Northwest A & F University, Yangling, People's Republic of China
| | - Dongfeng Yang
- College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou, People's Republic of China
| | - Wenjing Li
- College of Life Sciences, Northwest A & F University, Yangling, People's Republic of China
| | - Zongsuo Liang
- College of Life Sciences, Northwest A & F University, Yangling, People's Republic of China
- College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou, People's Republic of China
| | - Yan Liu
- Tianjin Tasly Modern Traditional Chinese Medicine Resources Co., Ltd, Tianjin, People's Republic of China
| | - Fenghua Liu
- Tianjin Tasly Modern Traditional Chinese Medicine Resources Co., Ltd, Tianjin, People's Republic of China
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Robbins ML, Roy A, Wang PH, Gaffoor I, Sekhon RS, de O Buanafina MM, Rohila JS, Chopra S. Comparative proteomics analysis by DIGE and iTRAQ provides insight into the regulation of phenylpropanoids in maize. J Proteomics 2013; 93:254-75. [PMID: 23811284 DOI: 10.1016/j.jprot.2013.06.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Revised: 06/06/2013] [Accepted: 06/10/2013] [Indexed: 12/17/2022]
Abstract
UNLABELLED The maize pericarp color1 (p1) gene encodes a Myb transcription factor that regulates the accumulation of 3-deoxyflavonoid pigments called phlobaphenes. The Unstable factor for orange1 (Ufo1) is a dominant epigenetic modifier of the p1 that results in ectopic pigmentation in pericarp. Presence of Ufo1-1 correlates with pleiotropic growth and developmental defects. To investigate the Ufo1-1-induced changes in the proteome, we conducted comparative proteomics analysis of P1-wr; Ufo1-1 pericarps using the 2-D DIGE and iTRAQ techniques. Most of the identified proteins were found to be involved in glycolysis, protein synthesis and modification, flavonoid and lignin biosynthesis and defense responses. Further, immunoblot analysis of internode protein extracts demonstrated that caffeoyl CoA O-methyltransferase (COMT) is post-transcriptionally down regulated in P1-wr; Ufo1-1 plants. Consistent with the down regulation of COMT, the concentrations of p-coumaric acid, syringaldehydes, and lignin are reduced in P1-wr; Ufo1-1 internodes. The reductions in these phenylpropanoids correlate with the bent stalk and stunted growth of P1-wr; Ufo1-1 plants. Finally, over-expression of the p1 in transgenic plants is also correlated with a lodging phenotype and reduced COMT expression. We conclude that ectopic expression of p1 can result in developmental defects that are correlated with altered regulation and synthesis of phenylpropanoid compounds including lignin. BIOLOGICAL SIGNIFICANCE Transcription factors have specific expression patterns that ensure that the biochemical pathways under their control are active in relevant tissues. Plant breeders can select for alleles of transcription factors that produce desirable expression patterns to improve a plant's growth, development, and defense against insects and pathogens. The resulting de novo accumulation of metabolites in plant tissues in significant quantities could have beneficial and/or detrimental consequences. To understand this problem we investigated how the aberrant expression of a classically-studied transcription factor pericarp color1 (p1) which regulates phenylpropanoid metabolism, affects the maize proteome in pericarp tissue. We utilized a dominant mutant Unstable factor for orange 1-1 (Ufo1-1) which reduces the epigenetic suppression of p1 in various tissues throughout the maize plant. Our proteomic analysis shows how, in the presence of Ufo1-1, key enzymes of the glycolytic and shikimic acid pathways were modulated to produce substrates required for flavonoid synthesis. The finding that the presence of Ufo1-1 affected the expression levels of various enzymes in the lignin pathway was of particular interest. We show that lignin was reduced in Ufo1-1 plants expressing p1 and was associated with the post-transcriptional down regulation of CoA O-methyltransferase (COMT) enzyme. We further correlated the down-regulation of COMT with plant bending phenotype in Ufo1-1 plants expressing p1 and to a stalk lodging phenotype of transgenic p1 plants. This study demonstrates that although there can be adverse consequences to aberrantly overexpressing transcription factors, there might also be benefits such as being able to reduce lignin content for biofuel crops. However, more research will be required to understand the genetic and epigenetic regulation of transcription factors and how their expression can be optimized to obtain desired traits in preferred tissue types. This article is part of a Special Issue entitled: Translational Plant Proteomics.
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Affiliation(s)
- Michael L Robbins
- Department of Plant Science, The Pennsylvania State University, University Park, PA 16802, USA
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Zhu L, Shan H, Chen S, Jiang J, Gu C, Zhou G, Chen Y, Song A, Chen F. The Heterologous Expression of the Chrysanthemum R2R3-MYB Transcription Factor CmMYB1 Alters Lignin Composition and Represses Flavonoid Synthesis in Arabidopsis thaliana. PLoS One 2013; 8:e65680. [PMID: 23840353 PMCID: PMC3686752 DOI: 10.1371/journal.pone.0065680] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Accepted: 04/25/2013] [Indexed: 01/04/2023] Open
Abstract
Plant R2R3-MYB transcription factor genes are widely distributed in higher plants and play important roles in the regulation of many secondary metabolites at the transcriptional level. In this study, a chrysanthemum subgroup 4 R2R3-MYB transcription factor gene, designated CmMYB1, was isolated through screening chrysanthemum EST (expressed sequence tag) libraries and using rapid application of cDNA ends (RACE) methods and functionally characterized. CmMYB1 is expressed in the root, stem, leaf and flowers, but most strongly in the stem and most weakly in the root. Its heterologous expression in Arabidopsis thaliana reduced the lignin content and altered the lignin composition. The heterologous expression also repressed the flavonoids content in A. thaliana. Together, these results suggested that CmMYB1 is a negative regulator of genes involved in the lignin pathway and flavonoid pathway, it may be a promising gene for controlling lignin and flavonoids profiles in plants.
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Affiliation(s)
- Lu Zhu
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Hong Shan
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
- Institute of Fishery Science of Nanjing, Nanjing, China
| | - Sumei Chen
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Jiafu Jiang
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Chunsun Gu
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Guoqin Zhou
- Institute of Fishery Science of Nanjing, Nanjing, China
| | - Yu Chen
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Aiping Song
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Fadi Chen
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
- * E-mail:
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Courtial A, Thomas J, Reymond M, Méchin V, Grima-Pettenati J, Barrière Y. Targeted linkage map densification to improve cell wall related QTL detection and interpretation in maize. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2013; 126:1151-65. [PMID: 23358861 DOI: 10.1007/s00122-013-2043-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Accepted: 01/09/2013] [Indexed: 05/09/2023]
Abstract
Several QTLs for cell wall degradability and lignin content were previously detected in the F288 × F271 maize RIL progeny, including a set of major QTLs located in bin 6.06. Unexpectedly, allelic sequencing of genes located around the bin 6.06 QTL positions revealed a monomorphous region, suggesting that these QTLs were likely "ghost" QTLs. Refining the positions of all QTLs detected in this population was thus considered, based on a linkage map densification in most important QTL regions, and in several large still unmarked regions. Re-analysis of data with an improved genetic map (173 markers instead of 108) showed that ghost QTLs located in bin 6.06 were then fractionated over two QTL positions located upstream and downstream of the monomorphic region. The area located upstream of bin 6.06 position carried the major QTLs, which explained from 37 to 59 % of the phenotypic variation for per se values and extended on only 6 cM, corresponding to a physical distance of 2.2 Mbp. Among the 92 genes present in the corresponding area of the B73 maize reference genome, nine could putatively be considered as involved in the formation of the secondary cell wall [bHLH, FKBP, laccase, fasciclin, zinc finger C2H2-type and C3HC4-type (two genes), NF-YB, and WRKY]. In addition, based on the currently improved genetic map, eight QTLs were detected in bin 4.09, while only one QTL was highlighted in the initial investigation. Moreover, significant epistatic interaction effects were shown for all traits between these QTLs located in bin 4.09 and the major QTLs located in bin 6.05. Three genes related to secondary cell wall assembly (ZmMYB42, COV1-like, PAL-like) underlay QTL support intervals in this newly identified bin 4.09 region. The current investigations, even if they were based only on one RIL progeny, illustrated the interest of a targeted marker mapping on a genetic map to improve QTL position.
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Affiliation(s)
- Audrey Courtial
- INRA, Unité de Génétique et d'Amélioration des Plantes Fourragères, 86600 Lusignan, France
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Omer S, Kumar S, Khan BM. Over-expression of a subgroup 4 R2R3 type MYB transcription factor gene from Leucaena leucocephala reduces lignin content in transgenic tobacco. PLANT CELL REPORTS 2013; 32:161-71. [PMID: 23052594 DOI: 10.1007/s00299-012-1350-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Revised: 09/18/2012] [Accepted: 09/19/2012] [Indexed: 06/01/2023]
Abstract
KEY MESSAGE : LlMYB1 , a subgroup 4 R2R3-type MYB transcription factor gene from Leucaena leucocephala appears to be a repressor of lignin biosynthesis pathway by regulating the transcription of general phenylpropanoid pathway genes. R2R3MYB transcription factors are known to play a wide role in regulating the phenylpropanoid pathway in plants. In this study, we report isolation, cloning and characterization of an R2R3MYB transcription factor gene (LlMYB1) from an economically important tree species, Leucaena leucocephala. LlMYB1 consists of 705 bp coding sequence corresponding to 235 amino acids. Sequence alignment revealed that the N-terminal (MYB) domain of the gene shares up to 95 % similarity with subgroup 4 (Sg4) members of R2R3Myb gene family functionally known to be lignin repressors. Highly divergent C-terminal region of the gene carried an ERF-associated amphiphilic repression (EAR) motif, another characteristic of the Sg4. The gene was phylogenetically grouped closest with AmMYB308, a known repressor of monolignol biosynthetic pathway genes. Spatio-temporal expression studies at different ages of seedlings using quantitative real-time PCR (QRT-PCR) showed highest transcript level of the gene in 10 day old stem tissues. Over-expression of the gene in transgenic tobacco showed statistically significant decline in the transcript levels of the general phenylpropanoid pathway genes and reduction in lignin content. Our study suggests that LlMYB1 might be playing the role of a repressor of lignin biosynthesis in L. leucocephala.
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Affiliation(s)
- Sumita Omer
- Plant Tissue Culture Division, CSIR-National Chemical Laboratory, Pune 411008, India
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50
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Feltus FA, Vandenbrink JP. Bioenergy grass feedstock: current options and prospects for trait improvement using emerging genetic, genomic, and systems biology toolkits. BIOTECHNOLOGY FOR BIOFUELS 2012; 5:80. [PMID: 23122416 PMCID: PMC3502489 DOI: 10.1186/1754-6834-5-80] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Accepted: 10/05/2012] [Indexed: 05/19/2023]
Abstract
For lignocellulosic bioenergy to become a viable alternative to traditional energy production methods, rapid increases in conversion efficiency and biomass yield must be achieved. Increased productivity in bioenergy production can be achieved through concomitant gains in processing efficiency as well as genetic improvement of feedstock that have the potential for bioenergy production at an industrial scale. The purpose of this review is to explore the genetic and genomic resource landscape for the improvement of a specific bioenergy feedstock group, the C4 bioenergy grasses. First, bioenergy grass feedstock traits relevant to biochemical conversion are examined. Then we outline genetic resources available bioenergy grasses for mapping bioenergy traits to DNA markers and genes. This is followed by a discussion of genomic tools and how they can be applied to understanding bioenergy grass feedstock trait genetic mechanisms leading to further improvement opportunities.
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Affiliation(s)
- Frank Alex Feltus
- Department of Genetics & Biochemistry, Clemson University, 105 Collings Street. BRC #302C, Clemson, SC, 29634, USA
| | - Joshua P Vandenbrink
- Department of Genetics & Biochemistry, Clemson University, 105 Collings Street. BRC #302C, Clemson, SC, 29634, USA
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