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Li L, Bi X, Wu X, Chen Z, Cao Y, Zhao G. Improving vitrification efficiency of human in vitro matured oocytes by the addition of LEA proteins. Hum Reprod 2024; 39:1275-1290. [PMID: 38592717 DOI: 10.1093/humrep/deae065] [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: 10/10/2023] [Revised: 03/01/2024] [Indexed: 04/10/2024] Open
Abstract
STUDY QUESTION Can the addition of late embryogenesis-abundant (LEA) proteins as a cryoprotective agent during the vitrification cryopreservation of in vitro matured oocytes enhance their developmental potential after fertilization? SUMMARY ANSWER LEA proteins improve the developmental potential of human in vitro matured oocytes following cryopreservation, mostly by downregulating FOS genes, reducing oxidative stress, and inhibiting the formation of ice crystals. WHAT IS KNOWN ALREADY Various factors in the vitrification process, including cryoprotectant toxicity, osmotic stress, and ice crystal formation during rewarming, can cause fatal damage to oocytes, thereby affecting the oocytes developmental potential and subsequent clinical outcomes. Recent studies have shown that LEA proteins possess high hydrophilicity and inherent stress tolerance, and can reduce low-temperature damage, although the molecular mechanism it exerts protective effects is still unclear. STUDY DESIGN, SIZE, DURATION Two LEA proteins extracted and purified by us were added to solutions for vitrification-warming of oocytes at concentrations of 10, 100, and 200 µg/mL, to determine the optimal protective concentration for each protein. Individual oocyte samples were collected for transcriptomic analysis, with each group consisting of three sample replicates. PARTICIPANTS/MATERIALS, SETTING, METHODS Immature oocytes were collected from patients who were undergoing combined in vitro fertilization (IVF) treatment and who had met the designated inclusion and exclusion criteria. These oocytes underwent in vitro maturation (IVM) culture for experimental research. A fluorescence microscope was used to detect the levels of mitochondrial membrane potential (MMP), reactive oxygen species (ROS), and calcium in the mitochondria of vitrified-warmed human oocytes treated with different concentrations of LEA proteins, and the protective effect of the protein on mitochondrial function was assessed. The levels of intracellular ice recrystallization inhibition (IRI) in human oocytes after vitrification-warming were characterized by the cryomicroscope, to determine the LEA proteins inhibitory effect on recrystallization. By analyzing transcriptome sequencing data to investigate the potential mechanism through which LEA proteins exert their cryoprotective effects. MAIN RESULTS AND THE ROLE OF CHANCE The secondary structures of AfrLEA2 and AfrLEA3m proteins were shown to consist of a large number of α-helices and the proteins were shown to be highly hydrophilic, in agreement with previous reports. Confocal microscopy results showed that the immunofluorescence of AfrLEA2-FITC and AfrLEA3m-FITC-labeled proteins appeared to be extracellular and did not penetrate the cell membrane compared with the fluorescein isothiocyanate (FITC) control group, indicating that both AfrLEA2 and AfrLEA3m proteins were extracellular. The group treated with 100 µg/mL AfrLEA2 or AfrLEA3m protein had more uniform cytoplasmic particles and fewer vacuoles compared to the 10 and 200 µg/mL groups and were closest to the fresh group. In the 100 µg/mL groups, MMPs were significantly higher while ROS and calcium levels were significantly lower than those in the control group and were closer to the levels observed in fresh oocytes. Meanwhile, 100 µg/mL of AfrLEA2 or AfrLEA3m protein caused smaller ice crystal formation in the IRI assay compared to the control group treated with dimethylsulphoxide (DMSO) and ethylene glycol (EG); thus, the recrystallization inhibition was superior to that with the conventional cryoprotectants DMSO and EG. Further results revealed that the proteins improved the developmental potential of human oocytes following cryopreservation, likely by downregulating FOS genes and reducing oxidative stress. LIMITATIONS, REASONS FOR CAUTION The in vitro-matured metaphase II (IVM-MII) oocytes used in the study, due to ethical constraints, may not accurately reflect the condition of MII oocytes in general. The AfrLEA2 and AfrLEA3m proteins are recombinant proteins and their synthetic stability needs to be further explored. WIDER IMPLICATIONS OF THE FINDINGS LEA proteins, as a non-toxic and effective cryoprotectant, can reduce the cryoinjury of oocytes during cryopreservation. It provides a new promising method for cryopreservation of various cell types. STUDY FUNDING/COMPETING INTEREST(S) This work was supported by the National Key Research and Development Program of China (2022YFC2703000) and the National Natural Science Foundation of China (52206064). The authors declare no competing interest. TRIAL REGISTRATION NUMBER N/A.
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Affiliation(s)
- Lu Li
- Department of Histology and Embryology, School of Basic Medicine Sciences, Anhui Medical University, Hefei, P.R. China
- Center of Reproductive Medicine, Children's Hospital of Shanxi and Women Health Center of Shanxi, Taiyuan, P.R. China
| | - Xingyu Bi
- Center of Reproductive Medicine, Children's Hospital of Shanxi and Women Health Center of Shanxi, Taiyuan, P.R. China
| | - Xueqing Wu
- Center of Reproductive Medicine, Children's Hospital of Shanxi and Women Health Center of Shanxi, Taiyuan, P.R. China
| | - Zhongrong Chen
- Department of Medical Engineering and Instrumentation, School of Biomedical Engineering, Anhui Medical University, Hefei, P. R. China
| | - Yunxia Cao
- Department of Obstetrics and Gynecology, Reproductive Medicine Center, The First Affiliated Hospital of Anhui Medical University, Hefei, P. R. China
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Anhui Medical University, Hefei, P. R. China
| | - Gang Zhao
- Department of Histology and Embryology, School of Basic Medicine Sciences, Anhui Medical University, Hefei, P.R. China
- Department of Medical Engineering and Instrumentation, School of Biomedical Engineering, Anhui Medical University, Hefei, P. R. China
- Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, P. R. China
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Miao M, Tan H, Liang L, Huang H, Chang W, Zhang J, Li J, Tang Y, Li Z, Lai Y, Yang L, Li H. Comparative transcriptome analysis of cold-tolerant and -sensitive asparagus bean under chilling stress and recovery. PeerJ 2022; 10:e13167. [PMID: 35341039 PMCID: PMC8953502 DOI: 10.7717/peerj.13167] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 03/04/2022] [Indexed: 01/12/2023] Open
Abstract
Background Low temperature is a type of abiotic stress that threatens the growth and yield of asparagus bean. However, the key genes and regulatory pathways involved in low temperature response in this legume are still poorly understood. Methodology. The present study analyzed the transcriptome of seedlings from two asparagus bean cultivars-Dubai bean and Ningjiang 3-using Illumina RNA sequencing (RNA-seq). Correlations between samples were determined by calculating Pearson correlation coefficients (PCC) and principal component analysis (PCA). Differentially expressed genes (DEGs) between two samples were identified using the DESeq package. Transcription factors (TF) prediction, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis of DEGs were also performed. Results Phenotypes and physiological indices indicated that Ningjiang 3 seedlings tolerated cold better than Dubai bean seedlings, in contrast to adult stage. The transcriptome dynamics of the two cultivars were closely compared using Illumina RNA-seq following 0, 3, 12, and 24 h of cold stress at 5 °C and recovery for 3 h at 25 °C room temperature. Global gene expression patterns displayed relatively high correlation between the two cultivars (>0.88), decreasing to 0.79 and 0.81, respectively, at 12 and 24 h of recovery, consistent with the results of principal component analysis. The major transcription factor families identified from differentially expressed genes between the two cultivars included bHLH, NAC, C2H2, MYB, WRKY, and AP2/ERF. The representative GO enrichment terms were protein phosphorylation, photosynthesis, oxidation-reduction process, and cellular glucan metabolic process. Moreover, KEGG analysis of DEGs within each cultivar revealed 36 transcription factors enriched in Dubai bean and Ningjiang 3 seedlings under cold stress. Conclusions These results reveal new information that will improve our understanding of the molecular mechanisms underlying the cold stress response of asparagus bean and provide genetic resources for breeding cold-tolerant asparagus bean cultivars.
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Affiliation(s)
- Mingjun Miao
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China,Horticulture Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu, Sichuan, China
| | - Huaqiang Tan
- Chengdu Academy of Agriculture and Forestry Sciences, Chengdu, Sichuan, China
| | - Le Liang
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Haitao Huang
- Mianyang Academy of Agricultural Sciences, Mianyang, Sichuan, China
| | - Wei Chang
- Horticulture Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu, Sichuan, China
| | - Jianwei Zhang
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Ju Li
- Horticulture Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu, Sichuan, China
| | - Yi Tang
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Zhi Li
- Horticulture Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu, Sichuan, China
| | - Yunsong Lai
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Liang Yang
- Horticulture Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu, Sichuan, China
| | - Huanxiu Li
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
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Li L, Zhou X, Chen Z, Cao Y, Zhao G. The group 3 LEA protein of Artemia franciscana for cryopreservation. Cryobiology 2022; 106:1-12. [DOI: 10.1016/j.cryobiol.2022.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 01/25/2022] [Accepted: 01/25/2022] [Indexed: 11/03/2022]
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Abdul Aziz M, Sabeem M, Mullath SK, Brini F, Masmoudi K. Plant Group II LEA Proteins: Intrinsically Disordered Structure for Multiple Functions in Response to Environmental Stresses. Biomolecules 2021; 11:1662. [PMID: 34827660 PMCID: PMC8615533 DOI: 10.3390/biom11111662] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/01/2021] [Accepted: 11/04/2021] [Indexed: 11/16/2022] Open
Abstract
In response to various environmental stresses, plants have evolved a wide range of defense mechanisms, resulting in the overexpression of a series of stress-responsive genes. Among them, there is certain set of genes that encode for intrinsically disordered proteins (IDPs) that repair and protect the plants from damage caused by environmental stresses. Group II LEA (late embryogenesis abundant) proteins compose the most abundant and characterized group of IDPs; they accumulate in the late stages of seed development and are expressed in response to dehydration, salinity, low temperature, or abscisic acid (ABA) treatment. The physiological and biochemical characterization of group II LEA proteins has been carried out in a number of investigations because of their vital roles in protecting the integrity of biomolecules by preventing the crystallization of cellular components prior to multiple stresses. This review describes the distribution, structural architecture, and genomic diversification of group II LEA proteins, with some recent investigations on their regulation and molecular expression under various abiotic stresses. Novel aspects of group II LEA proteins in Phoenix dactylifera and in orthodox seeds are also presented. Genome-wide association studies (GWAS) indicated a ubiquitous distribution and expression of group II LEA genes in different plant cells. In vitro experimental evidence from biochemical assays has suggested that group II LEA proteins perform heterogenous functions in response to extreme stresses. Various investigations have indicated the participation of group II LEA proteins in the plant stress tolerance mechanism, spotlighting the molecular aspects of group II LEA genes and their potential role in biotechnological strategies to increase plants' survival in adverse environments.
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Affiliation(s)
- Mughair Abdul Aziz
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
| | - Miloofer Sabeem
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
| | - Sangeeta Kutty Mullath
- Department of Vegetable Science, College of Agriculture, Kerala Agricultural University, Thrissur 680656, India;
| | - Faical Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS), University of Sfax, B.P 1177, Sfax 3018, Tunisia;
| | - Khaled Masmoudi
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
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Zaman Khan N, Lal S, Ali W, Aasim M, Mumtaz S, Kamil A, Shad Bibi N. Distribution and Classification of Dehydrins in Selected Plant Species Using Bioinformatics Approach. IRANIAN JOURNAL OF BIOTECHNOLOGY 2020; 18:e2680. [PMID: 34056027 PMCID: PMC8148643 DOI: 10.30498/ijb.2020.2680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Background: Plant growth, reproduction and yields are severely damaged under adverse environmental stresses. These stresses can be either biotic or abiotic, and many stress related proteins are expressed in response to these stresses. Among these proteins dehydrins are reported to have a role primarily in the abiotic stresses. Dehydrins are very diverse proteins and a uniform annotation system is needed for their functional characterization in the future research. Objectives: The aim of the present work is to identify, classify and analyze the expression of dehydrin proteins under different biotic and abiotic stresses in the selected plant species by using different computational tools. Materials and Methods: Prosite database is used for dehydrin proteins identification, and to conform the location of conserved motifs in selected plant species. The dehydrins extracted from uniprot database were annotated, based on the ensemble plant gene id. Subcellular localization was predicted using PSI predictor tool. Dehydrin expression analyses were retrieved form the genevestigator tool. Results: Dehydrins were annotated on the basis of dehydrin gene locus and conserved motifs available in different domain databases.
Dehydrins were identified and annotated in Arabidopsis thaliana (13), Glycine max (12), Zea mays (05),
Oryza sativa (11), Solanum tuberosum (05), Solanum lycopersicum (06), Triticum aestivum (32)
and Vitis vinifera (06). It has been proposed that dehydrins are located primarily in cytosol
and nucleus. Based on genevestigater expression analyses the plant species selected for this study contain all the
classes of dehydrins, namely YnSKn, Kn, SKn, and YnKn; except class KnS. Conclusions: Dehydrins are diverse proteins and a uniform classification is introduced for their better characterization.
The distribution of dehydrins in different tissues and developmental stages suggest an important function throughout
plant growth cycle. It has also been concluded that dehydrins expressed particularly in drought, cold and salt stresses,
and may have limited role in heat, anoxia, heavy-metal and biotic stresses as well.
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Affiliation(s)
- Nadir Zaman Khan
- Department of Biotechnology, University of Malakand, Chakdara, Lower Dir, Pakistan
| | - Shahzadi Lal
- Department of Biotechnology, University of Malakand, Chakdara, Lower Dir, Pakistan
| | - Waqar Ali
- Department of Biotechnology, University of Malakand, Chakdara, Lower Dir, Pakistan
| | - Muhammad Aasim
- Department of Biotechnology, University of Malakand, Chakdara, Lower Dir, Pakistan
| | - Saqib Mumtaz
- Department of Biosciences, COMSAT University, Islamabad, Pakistan
| | - Atif Kamil
- Department of Biotechnology, Abdul Wali Khan University Mardan, Pakistan
| | - Noor Shad Bibi
- Department of Biochemistry, Abdul Wali Khan University Mardan, Pakistan
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Hellwig T, Flor A, Saranga Y, Coyne CJ, Main D, Sherman A, Ophir R, Abbo S. Environmental and genetic determinants of amphicarpy in Pisum fulvum, a wild relative of domesticated pea. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 298:110566. [PMID: 32771167 DOI: 10.1016/j.plantsci.2020.110566] [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: 03/15/2020] [Revised: 06/08/2020] [Accepted: 06/13/2020] [Indexed: 06/11/2023]
Abstract
Pisum fulvum is an annual legume native to Syria, Lebanon, Israel and Jordan. In certain locations, P. fulvum individuals were documented to display a reproductive dimorphism - amphicarpy, with both above and below ground flowers and pods. Herein we aimed to study the possible role of soil texture on amphicarpy in P. fulvum, to investigate the possible bio-climatic associations of P. fulvum amphicarpy and to identify genetic markers associated with this phenotype. A set of 127 germplasm accessions sampled across the Israeli distribution range of the species was phenotyped in two common garden nurseries. Land use and bioclimatic data were used to delineate the eco-geographic clustering of accession's sampling sites. Single nucleotide polymorphism (SNP) markers were employed in genome-wide association study to identify associated loci. Amphicarpy was subject to strong experimental site x genotype interaction with higher phenotypic expression in fine textured soil relative to sandy loam. Amphicarpy was more prevalent among accessions sampled in eastern Judea and Samaria and was weakly associated with early phenology and relatively modest above ground biomass production. Twelve SNP markers were significantly associated with amphicarpy, each explaining between 8 and 12 % of the phenotypic variation. In P. fulvum amphicarpy seems to be a polygenetic trait controlled by an array of genes that is likely to be affected by environmental stimuli. The probable selective advantage of the association between amphicarpy and early flowering is in line with its relative prevalence in drought prone territories subject to heavy grazing.
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Affiliation(s)
- Timo Hellwig
- The Levi Eshkol School of Agriculture, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot, 76100, Israel; Institute of Plant Sciences, The Volcani Center ARO, P.O. Box 6, Bet Dagan, 50250, Israel.
| | - Almog Flor
- The Levi Eshkol School of Agriculture, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot, 76100, Israel
| | - Yehoshua Saranga
- The Levi Eshkol School of Agriculture, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot, 76100, Israel
| | - Clarice J Coyne
- USDA-ARS Plant Germplasm Introduction and Testing, Washington State Univ., Pullman, WA, 99164, USA
| | - Dorrie Main
- Dept. of Horticulture, Washington State Univ., Pullman, WA, 99164, USA
| | - Amir Sherman
- Institute of Plant Sciences, The Volcani Center ARO, P.O. Box 6, Bet Dagan, 50250, Israel
| | - Ron Ophir
- Institute of Plant Sciences, The Volcani Center ARO, P.O. Box 6, Bet Dagan, 50250, Israel
| | - Shahal Abbo
- The Levi Eshkol School of Agriculture, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot, 76100, Israel; Dept. of Horticulture, Washington State Univ., Pullman, WA, 99164, USA
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Yazdanpanah F, Hanson J, Hilhorst HW, Bentsink L. Differentially expressed genes during the imbibition of dormant and after-ripened seeds - a reverse genetics approach. BMC PLANT BIOLOGY 2017; 17:151. [PMID: 28893189 PMCID: PMC5594490 DOI: 10.1186/s12870-017-1098-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 09/05/2017] [Indexed: 05/12/2023]
Abstract
BACKGROUND Seed dormancy, defined as the incapability of a viable seed to germinate under favourable conditions, is an important trait in nature and agriculture. Despite extensive research on dormancy and germination, many questions about the molecular mechanisms controlling these traits remain unanswered, likely due to its genetic complexity and the large environmental effects which are characteristic of these quantitative traits. To boost research towards revealing mechanisms in the control of seed dormancy and germination we depend on the identification of genes controlling those traits. METHODS We used transcriptome analysis combined with a reverse genetics approach to identify genes that are prominent for dormancy maintenance and germination in imbibed seeds of Arabidopsis thaliana. Comparative transcriptomics analysis was employed on freshly harvested (dormant) and after-ripened (AR; non-dormant) 24-h imbibed seeds of four different DELAY OF GERMINATION near isogenic lines (DOGNILs) and the Landsberg erecta (Ler) wild type with varying levels of primary dormancy. T-DNA knock-out lines of the identified genes were phenotypically investigated for their effect on dormancy and AR. RESULTS We identified conserved sets of 46 and 25 genes which displayed higher expression in seeds of all dormant and all after-ripened DOGNILs and Ler, respectively. Knock-out mutants in these genes showed dormancy and germination related phenotypes. CONCLUSIONS Most of the identified genes had not been implicated in seed dormancy or germination. This research will be useful to further decipher the molecular mechanisms by which these important ecological and commercial traits are regulated.
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Affiliation(s)
- Farzaneh Yazdanpanah
- Wageningen Seed Laboratory, Laboratory of Plant Physiology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Johannes Hanson
- Umeå Plant Science Center, Department of Plant Physiology, Umeå University, SE-901 87 Umeå, Sweden
- Department of Molecular Plant Physiology, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Henk W.M. Hilhorst
- Wageningen Seed Laboratory, Laboratory of Plant Physiology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Leónie Bentsink
- Wageningen Seed Laboratory, Laboratory of Plant Physiology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
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Bao F, Du D, An Y, Yang W, Wang J, Cheng T, Zhang Q. Overexpression of Prunus mume Dehydrin Genes in Tobacco Enhances Tolerance to Cold and Drought. FRONTIERS IN PLANT SCIENCE 2017; 8:151. [PMID: 28224001 PMCID: PMC5293821 DOI: 10.3389/fpls.2017.00151] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 01/25/2017] [Indexed: 05/02/2023]
Abstract
Dehydrins, known as group 2 or D-11 family late-embryogenesis-abundant (LEA) proteins, play important roles in plant growth and stress tolerance. Six dehydrin genes were previously identified from the genome of Prunus mume. In this study, five of them (PmLEA8, PmLEA10, PmLEA19, PmLEA20, and PmLEA29) were cloned from cold-resistant P. mume 'Beijingyudie'. Real-time RT-PCR analysis indicated that all these genes could be up-regulated by one or several treatments (ABA, SA, low temperature, high temperature, PEG, and NaCl treatments). The results of spot assay demonstrated that the expression of all these dehydrins, except PmLEA8, conferred improved osmotic and freezing-resistance to the recombinant Escherichia coli. So four dehydrin genes, PmLEA10, PmLEA19, PmLEA20 and PmLEA29 were chosen for individual over-expression in tobacco plants. The transgenic tobacco plants showed lower relative content of malondialdehyde, relative electrolyte leakage and higher relative content of water than control plants when exposed to cold and drought stress. These results demonstrated that PmLEAs were involved in plant responses to cold and drought.
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Xia K, Pittelli S, Church J, Colón W. Kinetic Stability of Proteins in Beans and Peas: Implications for Protein Digestibility, Seed Germination, and Plant Adaptation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:7649-7657. [PMID: 27643830 DOI: 10.1021/acs.jafc.6b01965] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Kinetically stable proteins (KSPs) are resistant to the denaturing detergent sodium dodecyl sulfate (SDS). Such resilience makes KSPs resistant to proteolytic degradation and may have arisen in nature as a mechanism for organismal adaptation and survival against harsh conditions. Legumes are well-known for possessing degradation-resistant proteins that often diminish their nutritional value. Here we applied diagonal two-dimensional (D2D) SDS-polyacrylamide gel electrophoresis (PAGE), a method that allows for the proteomics-level identification of KSPs, to a group of 12 legumes (mostly beans and peas) of agricultural and nutritional importance. Our proteomics results show beans that are more difficult to digest, such as soybean, lima beans, and various common beans, have high contents of KSPs. In contrast, mung bean, red lentil, and various peas that are highly digestible contain low amounts of KSPs. Identified proteins with high kinetic stability are associated with warm-season beans, which germinate at higher temperatures. In contrast, peas and red lentil, which are cool-season legumes, contain low levels of KSPs. Thus, our results show protein kinetic stability is an important factor in the digestibility of legume proteins and may relate to nutrition efficiency, timing of seed germination, and legume resistance to biotic stressors. Furthermore, we show D2D SDS-PAGE is a powerful method that could be applied for determining the abundance and identity of KSPs in engineered and wild legumes and for advancing basic research and associated applications.
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Affiliation(s)
- Ke Xia
- Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
| | - Sandy Pittelli
- Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
| | - Jennifer Church
- Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
| | - Wilfredo Colón
- Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
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Tan H, Huang H, Tie M, Tang Y, Lai Y, Li H. Transcriptome Profiling of Two Asparagus Bean (Vigna unguiculata subsp. sesquipedalis) Cultivars Differing in Chilling Tolerance under Cold Stress. PLoS One 2016; 11:e0151105. [PMID: 26954786 PMCID: PMC4783050 DOI: 10.1371/journal.pone.0151105] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 02/22/2016] [Indexed: 11/29/2022] Open
Abstract
Cowpea (V. unguiculata L. Walp.) is an important tropical grain legume. Asparagus bean (V. unguiculata ssp. sesquipedialis) is a distinctive subspecies of cowpea, which is considered one of the top ten Asian vegetables. It can be adapted to a wide range of environmental stimuli such as drought and heat. Nevertheless, it is an extremely cold-sensitive tropical species. Improvement of chilling tolerance in asparagus bean may significantly increase its production and prolong its supply. However, gene regulation and signaling pathways related to cold response in this crop remain unknown. Using Illumina sequencing technology, modification of global gene expression in response to chilling stress in two asparagus bean cultivars—“Dubai bean” and “Ningjiang-3”, which are tolerant and sensitive to chilling, respectively—were investigated. More than 1.8 million clean reads were obtained from each sample. After de novo assembly, 88,869 unigenes were finally generated with a mean length of 635 bp. Of these unigenes, 41,925 (47.18%) had functional annotations when aligned to public protein databases. Further, we identified 3,510 differentially expressed genes (DEGs) in Dubai bean, including 2,103 up-regulated genes and 1,407 down-regulated genes. While in Ningjiang-3, we found 2,868 DEGs, 1,786 of which were increasing and the others were decreasing. 1,744 DEGs were commonly regulated in two cultivars, suggesting that some genes play fundamental roles in asparagus bean during cold stress. Functional classification of the DEGs in two cultivars using Mercator pipeline indicated that RNA, protein, signaling, stress and hormone metabolism were five major groups. In RNA group, analysis of TFs in DREB subfamily showed that ICE1-CBF3-COR cold responsive cascade may also exist in asparagus bean. Our study is the first to provide the transcriptome sequence resource for asparagus bean, which will accelerate breeding cold resistant asparagus bean varieties through genetic engineering, and advance our knowledge of the genes involved in the complex regulatory networks of this plant under cold stress.
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Affiliation(s)
- Huaqiang Tan
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Haitao Huang
- Mianyang Institute of Agricultural Sciences, Mianyang, Sichuan, China
| | - Manman Tie
- Dazhou Institute of Agricultural Sciences, Dazhou, Sichuan, China
| | - Yi Tang
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Yunsong Lai
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Huanxiu Li
- College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China
- * E-mail:
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Melmaiee K, Anderson M, Elavarthi S, Guenzi A, Canaan P. Transcriptional Analysis of Resistance to Low Temperatures in Bermudagrass Crown Tissues. PLoS One 2015; 10:e0136433. [PMID: 26348040 PMCID: PMC4562713 DOI: 10.1371/journal.pone.0136433] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Accepted: 08/04/2015] [Indexed: 11/18/2022] Open
Abstract
Bermudagrass (Cynodon dactylon L pers.) is one of the most geographically adapted and utilized of the warm-season grasses. However, bermudagrass adaptation to the Northern USA is limited by freeze damage and winterkill. Our study provides the first large-scale analyses of gene expression in bermudagrass regenerative crown tissues during cold acclimation. We compared gene expression patterns in crown tissues from highly cold tolerant "MSU" and susceptible "Zebra" genotypes exposed to near-freezing temperatures. Suppressive subtractive hybridization was used to isolate putative cold responsive genes Approximately, 3845 transcript sequences enriched for cold acclimation were deposited in the GenBank. A total of 4589 ESTs (3184 unigenes) including 744 ESTs associated with the bermudagrass disease spring dead spot were printed on microarrays and hybridized with cold acclimated complementary Deoxyribonucleic acid (cDNA). A total of 587 differentially expressed unigenes were identified in this study. Of these only 97 (17%) showed significant NCBI matches. The overall expression pattern revealed 40% more down- than up-regulated genes, which was particularly enhanced in MSU compared to Zebra. Among the up-regulated genes 68% were uniquely expressed in MSU (36%) or Zebra (32%). Among the down-regulated genes 40% were unique to MSU, while only 15% to Zebra. Overall expression intensity was significantly higher in MSU than in Zebra (p value ≤ 0.001) and the overall number of genes expressed at 28 days was 2.7 fold greater than at 2 days. These changes in expression patterns reflect the strong genotypic and temporal response to cold temperatures. Additionally, differentially expressed genes from this study can be utilized for developing molecular markers in bermudagrass and other warm season grasses for enhancing cold hardiness.
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Affiliation(s)
- Kalpalatha Melmaiee
- Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, Oklahoma, United States of America
| | - Michael Anderson
- Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, Oklahoma, United States of America
| | - Sathya Elavarthi
- Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, Oklahoma, United States of America
| | - Arron Guenzi
- Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, Oklahoma, United States of America
| | - Patricia Canaan
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, Oklahoma, United States of America
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Jyothi-Prakash PA, Mohanty B, Wijaya E, Lim TM, Lin Q, Loh CS, Kumar PP. Identification of salt gland-associated genes and characterization of a dehydrin from the salt secretor mangrove Avicennia officinalis. BMC PLANT BIOLOGY 2014; 14:291. [PMID: 25404140 PMCID: PMC4247641 DOI: 10.1186/s12870-014-0291-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 10/15/2014] [Indexed: 05/06/2023]
Abstract
BACKGROUND Salt stress is a major challenge for growth and development of plants. The mangrove tree Avicennia officinalis has evolved salt tolerance mechanisms such as salt secretion through specialized glands on its leaves. Although a number of structural studies on salt glands have been done, the molecular mechanism of salt secretion is not clearly understood. Also, studies to identify salt gland-specific genes in mangroves have been scarce. RESULTS By subtractive hybridization (SH) of cDNA from salt gland-rich cell layers (tester) with mesophyll tissues as the driver, several Expressed Sequence Tags (ESTs) were identified. The major classes of ESTs identified include those known to be involved in regulating metabolic processes (37%), stress response (17%), transcription (17%), signal transduction (17%) and transport functions (12%). A visual interactive map generated based on predicted functional gene interactions of the identified ESTs suggested altered activities of hydrolase, transmembrane transport and kinases. Quantitative Real-Time PCR (qRT-PCR) was carried out to validate the expression specificity of the ESTs identified by SH. A Dehydrin gene was chosen for further experimental analysis, because it is significantly highly expressed in salt gland cells, and dehydrins are known to be involved in stress remediation in other plants. Full-length Avicennia officinalis Dehydrin1 (AoDHN1) cDNA was obtained by Rapid Amplification of cDNA Ends. Phylogenetic analysis and further characterization of this gene suggested that AoDHN1 belongs to group II Late Embryogenesis Abundant proteins. qRT-PCR analysis of Avicennia showed up-regulation of AoDHN1 in response to salt and drought treatments. Furthermore, some functional insights were obtained by growing E. coli cells expressing AoDHN1. Growth of E. coli cells expressing AoDHN1 was significantly higher than that of the control cells without AoDHN1 under salinity and drought stresses, suggesting that the mangrove dehydrin protein helps to mitigate the abiotic stresses. CONCLUSIONS Thirty-four ESTs were identified to be enriched in salt gland-rich tissues of A. officinalis leaves. qRT-PCR analysis showed that 10 of these were specifically enriched in the salt gland-rich tissues. Our data suggest that one of the selected genes, namely, AoDHN1 plays an important role to mitigate salt and drought stress responses.
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Affiliation(s)
- Pavithra A Jyothi-Prakash
- />Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore, Republic of Singapore
- />NUS Environmental Research Institute (NERI), National University of Singapore, #02-01, T-Lab Building, 5A Engineering Drive 1, Singapore, Republic of Singapore
| | - Bijayalaxmi Mohanty
- />Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, Republic of Singapore
| | - Edward Wijaya
- />IFReC, Osaka University, 3-1 Yamada-oka, Suita, Osaka 565-0871 Japan
| | - Tit-Meng Lim
- />Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore, Republic of Singapore
| | - Qingsong Lin
- />Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore, Republic of Singapore
| | - Chiang-Shiong Loh
- />Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore, Republic of Singapore
- />NUS Environmental Research Institute (NERI), National University of Singapore, #02-01, T-Lab Building, 5A Engineering Drive 1, Singapore, Republic of Singapore
| | - Prakash P Kumar
- />Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore, Republic of Singapore
- />Temasek Life Sciences Laboratory, National University of Singapore, 1 Research Link, Singapore, Republic of Singapore
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13
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Vaseva II, Anders I, Yuperlieva-Mateeva B, Nenkova R, Kostadinova A, Feller U. Dehydrin expression as a potential diagnostic tool for cold stress in white clover. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 78:43-8. [PMID: 24632490 DOI: 10.1016/j.plaphy.2014.02.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2013] [Accepted: 02/18/2014] [Indexed: 05/10/2023]
Abstract
Cold acclimation is important for crop survival in environments undergoing seasonal low temperatures. It involves the induction of defensive mechanisms including the accumulation of different cryoprotective molecules among which are dehydrins (DHN). Recently several sequences coding for dehydrins were identified in white clover (Trifolium repens). This work aimed to select the most responsive to cold stress DHN analogues in search for cold stress diagnostic markers. The assessment of dehydrin transcript accumulation via RT-PCR and immunodetection performed with three antibodies against the conserved K-, Y-, and S-segment allowed to outline different dehydrin types presented in the tested samples. Both analyses confirmed that YnKn dehydrins were underrepresented in the controls but exposure to low temperature specifically induced their accumulation. Strong immunosignals corresponding to 37-40 kDa with antibodies against Y- and K-segment were revealed in cold-stressed leaves. Another 'cold-specific' band at position 52-55 kDa was documented on membranes probed with antibodies against K-segment. Real time RT-qPCR confirmed that low temperatures induced the accumulation of SKn and YnSKn transcripts in leaves and reduced their expression in roots. Results suggest that a YnKn dehydrin transcript with GenBank ID: KC247805 and the immunosignal at 37-40 kDa, obtained with antibodies against Y- and K-segment are reliable markers for cold stress in white clover. The assessment of SKn (GenBank ID: EU846208) and YnSKn (GenBank ID: KC247804) transcript levels in leaves could serve as additional diagnostic tools.
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Affiliation(s)
- Irina Ivanova Vaseva
- Plant Stress Molecular Biology Department, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria; Institute of Plant Sciences and Oeschger Centre for Climate Change Research (OCCR), University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland.
| | - Iwona Anders
- Institute of Plant Sciences and Oeschger Centre for Climate Change Research (OCCR), University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
| | - Bistra Yuperlieva-Mateeva
- Plant Stress Molecular Biology Department, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Rosa Nenkova
- Plant Stress Molecular Biology Department, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Anelia Kostadinova
- Plant Stress Molecular Biology Department, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Urs Feller
- Institute of Plant Sciences and Oeschger Centre for Climate Change Research (OCCR), University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
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Mazzeo MF, Cacace G, Ferriello F, Puopolo G, Zoina A, Ercolano MR, Siciliano RA. Proteomic investigation of response to FORL infection in tomato roots. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 74:42-9. [PMID: 24262994 DOI: 10.1016/j.plaphy.2013.10.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Accepted: 10/24/2013] [Indexed: 05/07/2023]
Abstract
Fusarium oxysporum f. sp. radicis-lycopersici (FORL) leading to fusarium crown and root rot is considered one of the most destructive tomato soilborne diseases occurring in greenhouse and field crops. In this study, response to FORL infection in tomato roots was investigated by differential proteomics in susceptible (Monalbo) and resistant (Momor) isogenic tomato lines, thus leading to identify 33 proteins whose amount changed depending on the pathogen infection, and/or on the two genotypes. FORL infection induced accumulation of pathogen-related proteins (PR proteins) displaying glucanase and endochitinases activity or involved in redox processes in the Monalbo genotype. Interestingly, the level of the above mentioned PR proteins was not influenced by FORL infection in the resistant tomato line, while other proteins involved in general response mechanisms to biotic and/or abiotic stresses showed significant quantitative differences. In particular, the increased level of proteins participating to arginine metabolism and glutathione S-transferase (GST; EC 2.5.1.18) as well as that of protein LOC544002 and phosphoprotein ECPP44-like, suggested their key role in pathogen defence.
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Affiliation(s)
- Maria Fiorella Mazzeo
- Proteomic and Biomolecular Mass Spectrometry Center, Institute of Food Sciences, Italian National Research Council (CNR), Via Roma 64 a/c, 83100 Avellino, Italy
| | - Giuseppina Cacace
- Proteomic and Biomolecular Mass Spectrometry Center, Institute of Food Sciences, Italian National Research Council (CNR), Via Roma 64 a/c, 83100 Avellino, Italy
| | - Francesca Ferriello
- Department of Agricultural Sciences, University of Naples 'Federico II', Via Università 100, 80055 Portici, NA, Italy
| | - Gerardo Puopolo
- Department of Sustainable Agro-Ecosystems and Bioresources, Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige, TN, Italy
| | - Astolfo Zoina
- Department of Agricultural Sciences, University of Naples 'Federico II', Via Università 100, 80055 Portici, NA, Italy
| | - Maria Raffaella Ercolano
- Department of Agricultural Sciences, University of Naples 'Federico II', Via Università 100, 80055 Portici, NA, Italy
| | - Rosa Anna Siciliano
- Proteomic and Biomolecular Mass Spectrometry Center, Institute of Food Sciences, Italian National Research Council (CNR), Via Roma 64 a/c, 83100 Avellino, Italy.
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Urban MO, Klíma M, Vítámvás P, Vašek J, Hilgert-Delgado AA, Kučera V. Significant relationships among frost tolerance and net photosynthetic rate, water use efficiency and dehydrin accumulation in cold-treated winter oilseed rapes. JOURNAL OF PLANT PHYSIOLOGY 2013; 170:1600-1608. [PMID: 24054752 DOI: 10.1016/j.jplph.2013.07.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Revised: 07/12/2013] [Accepted: 07/17/2013] [Indexed: 06/02/2023]
Abstract
Five winter oilseed rape cultivars (Benefit, Californium, Cortes, Ladoga, Navajo) were subjected to 30 days of cold treatment (4 °C) to examine the effect of cold on acquired frost tolerance (FT), dehydrin (DHN) content, and photosynthesis-related parameters. The main aim of this study was to determine whether there are relationships between FT (expressed as LT50 values) and the other parameters measured in the cultivars. While the cultivar Benefit accumulated two types of DHNs (D45 and D35), the other cultivars accumulated three additional DHNs (D97, D47, and D37). The similar-sized DHNs (D45 and D47) were the most abundant; the others exhibited significantly lower accumulations. The highest correlations were detected between LT50 and DHN accumulation (r=-0.815), intrinsic water use efficiency (WUEi; r=-0.643), net photosynthetic rate (r=-0.628), stomatal conductance (r=0.511), and intracellular/intercellular CO2 concentration (r=0.505). Those cultivars that exhibited higher Pn rate in cold (and further a significant increase in WUEi) had higher levels of DHNs and also higher FT. No significant correlation was observed between LT50 and E, PRI, or NDVI. Overall, we have shown the selected physiological parameters to be able to distinguish different FT cultivars of winter oilseed rape.
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Yamasaki Y, Koehler G, Blacklock BJ, Randall SK. Dehydrin expression in soybean. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 70:213-20. [PMID: 23792826 DOI: 10.1016/j.plaphy.2013.05.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 05/10/2013] [Indexed: 05/24/2023]
Abstract
Soybean (Glycine max) is a relatively cold intolerant plant. In most stress tolerant plants the responsive expression of dehydrin proteins in vegetative tissues can be a significant contributor to protection against environmental stresses. The purpose of this study was to examine the expression of dehydrins in various organs and the cold-responses of dehydrin genes in vegetative tissues of soybean. Examination of the soybean genome indicated the presence of genes encoding ten distinct dehydrins. Levels of dehydrin proteins were probed with several antibodies specific to dehydrins or to the signature K-sequence. A single vegetatively expressed dehydrin protein was detected and the levels were insignificantly altered in response to cold, drought, or salt stress, nor was the transcript responsive to ABA. This SK2-type, acidic dehydrin family member (GmERD14) was purified, identified by mass spectroscopy, and shown to be in vivo phosphorylated; indicating characteristics similar to other known acidic dehydrins. The lack of cold stress-regulated acidic dehydrin expression may contribute to the inability of soybean to cold acclimate. While transcripts for all ten dehydrins could be detected in various tissues, only three accumulated to significant levels in vegetative tissues (two of the KS type and one of SK2 type). One of these transcripts, a KS dehydrin, was accumulated following cold treatments. The accumulation of the KS dehydrin was also responsive to exogenous ABA.
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Affiliation(s)
- Yuji Yamasaki
- Department of Biology, Indiana University-Purdue University Indianapolis, 723 W Michigan Street, Indianapolis, IN 46202, USA
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17
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Burrieza HP, López-Fernández MP, Chiquieri TB, Silveira V, Maldonado S. Accumulation pattern of dehydrins during sugarcane (var. SP80.3280) somatic embryogenesis. PLANT CELL REPORTS 2012; 31:2139-2149. [PMID: 22868443 DOI: 10.1007/s00299-012-1323-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Revised: 07/06/2012] [Accepted: 07/13/2012] [Indexed: 06/01/2023]
Abstract
UNLABELLED The objective of the present study was to determine dehydrin protein levels in sugarcane var. SP80-3280 during somatic embryogenesis. Dehydrins from embryogenic and non-embryogenic cell cultures were analyzed using western blot and in situ immunolocalization microscopy. Both techniques employ antibodies raised against a highly conserved lysine-rich 15-amino acid sequence termed the K-domain, which is extensively used to recognize proteins immunologically related to the dehydrin family. In embryogenic cultures, western blot analysis of the heat-stable protein fraction revealed eleven major bands ranging from 52 to 17 kDa. They were already visible on the first days, gradually increasing until reaching peak values around day 14, when organogenesis begins, to later decrease in concurrence with the appearance of green plantlets (around day 28). These fluctuations indicate that this pattern of accumulation is under developmental control. Dehydrins were mainly immunolocalized in the nuclei. A phosphatase treatment of protein extracts caused a mobility shift of the 52, 49, and 43 kDa dehydrin bands suggesting a putative modulation mechanism based on protein phosphorylation. In sugarcane embryogenic cultures, presence of dehydrins is a novel finding. Dehydrins were absent in non-embryogenic cultures. The novel findings regarding accumulation, nuclear localization, and phosphorylation of dehydrins provide a starting point for further research on the role of these proteins in the induction and/or maintenance of embryogenesis. KEY MESSAGE The novel findings regarding accumulation, nuclear localization, and phosphorylation of dehydrins provide a starting point for further research on the role of these proteins in the induction and/or maintenance of embryogenesis.
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Affiliation(s)
- Hernán Pablo Burrieza
- Departamento de Biodiversidad y Biología Experimental, Universidad de Buenos Aires, Pabellón 2 Ciudad Universitaria, C1428EGA Buenos Aires, Argentina
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18
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Chatelain E, Hundertmark M, Leprince O, Le Gall S, Satour P, Deligny-Penninck S, Rogniaux H, Buitink J. Temporal profiling of the heat-stable proteome during late maturation of Medicago truncatula seeds identifies a restricted subset of late embryogenesis abundant proteins associated with longevity. PLANT, CELL & ENVIRONMENT 2012; 35:1440-55. [PMID: 22380487 DOI: 10.1111/j.1365-3040.2012.02501.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Developing seeds accumulate late embryogenesis abundant (LEA) proteins, a family of intrinsically disordered and hydrophilic proteins that confer cellular protection upon stress. Many different LEA proteins exist in seeds, but their relative contribution to seed desiccation tolerance or longevity (duration of survival) is not yet investigated. To address this, a reference map of LEA proteins was established by proteomics on a hydrophilic protein fraction from mature Medicago truncatula seeds and identified 35 polypeptides encoded by 16 LEA genes. Spatial and temporal expression profiles of the LEA polypeptides were obtained during the long maturation phase during which desiccation tolerance and longevity are sequentially acquired until pod abscission and final maturation drying occurs. Five LEA polypeptides, representing 6% of the total LEA intensity, accumulated upon acquisition of desiccation tolerance. The gradual 30-fold increase in longevity correlated with the accumulation of four LEA polypeptides, representing 35% of LEA in mature seeds, and with two chaperone-related polypeptides. The majority of LEA polypeptides increased around pod abscission during final maturation drying. The differential accumulation profiles of the LEA polypeptides suggest different roles in seed physiology, with a small subset of LEA and other proteins with chaperone-like functions correlating with desiccation tolerance and longevity.
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López-Martínez G, Rodríguez-Porrata B, Margalef-Català M, Cordero-Otero R. The STF2p hydrophilin from Saccharomyces cerevisiae is required for dehydration stress tolerance. PLoS One 2012; 7:e33324. [PMID: 22442684 PMCID: PMC3306391 DOI: 10.1371/journal.pone.0033324] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Accepted: 02/07/2012] [Indexed: 12/15/2022] Open
Abstract
The yeast Saccharomyces cerevisiae is able to overcome cell dehydration; cell metabolic activity is arrested during this period but restarts after rehydration. The yeast genes encoding hydrophilin proteins were characterised to determine their roles in the dehydration-resistant phenotype, and STF2p was found to be a hydrophilin that is essential for survival after the desiccation-rehydration process. Deletion of STF2 promotes the production of reactive oxygen species and apoptotic cell death during stress conditions, whereas the overexpression of STF2, whose gene product localises to the cytoplasm, results in a reduction in ROS production upon oxidative stress as the result of the antioxidant capacity of the STF2p protein.
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Affiliation(s)
| | | | | | - Ricardo Cordero-Otero
- Department of Biochemistry and Biotechnology, University Rovira i Virgili, Tarragona, Spain
- * E-mail:
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20
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Muñoz-Mayor A, Pineda B, Garcia-Abellán JO, Antón T, Garcia-Sogo B, Sanchez-Bel P, Flores FB, Atarés A, Angosto T, Pintor-Toro JA, Moreno V, Bolarin MC. Overexpression of dehydrin tas14 gene improves the osmotic stress imposed by drought and salinity in tomato. JOURNAL OF PLANT PHYSIOLOGY 2012; 169:459-68. [PMID: 22226709 DOI: 10.1016/j.jplph.2011.11.018] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 10/27/2011] [Accepted: 11/23/2011] [Indexed: 05/06/2023]
Abstract
One strategy to increase the level of drought and salinity tolerance is the transfer of genes codifying different types of proteins functionally related to macromolecules protection, such as group 2 of late embryogenesis abundant (LEA) proteins or dehydrins. The TAS14 dehydrin was isolated and characterized in tomato and its expression was induced by osmotic stress (NaCl and mannitol) and abscisic acid (ABA) [Godoy et al., Plant Mol Biol 1994;26:1921-1934], yet its function in drought and salinity tolerance of tomato remains elusive. In this study, transgenic tomato plants overexpressing tas14 gene under the control of the 35SCaMV promoter were generated to assess the function of tas14 gene in drought and salinity tolerance. The plants overexpressing tas14 gene achieved improved long-term drought and salinity tolerance without affecting plant growth under non-stress conditions. A mechanism of osmotic stress tolerance via osmotic potential reduction and solutes accumulation, such as sugars and K(+) is operating in tas14 overexpressing plants in drought conditions. A similar mechanism of osmotic stress tolerance was observed under salinity. Moreover, the overexpression of tas14 gene increased Na(+) accumulation only in adult leaves, whereas in young leaves, the accumulated solutes were K(+) and sugars, suggesting that plants overexpressing tas14 gene are able to distribute the Na(+) accumulation between young and adult leaves over a prolonged period in stressful conditions. Measurement of ABA showed that the action mechanism of tas14 gene is associated with an earlier and greater accumulation of ABA in leaves during short-term periods. A good feature for the application of this gene in improving drought and salt stress tolerance is the fact that its constitutive expression does not affect plant growth under non-stress conditions, and tolerance induced by overexpression of tas14 gene was observed at the different stress degrees applied to the long term.
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Affiliation(s)
- Alicia Muñoz-Mayor
- CEBAS-CSIC, Department of Stress Biology and Plant Pathology, Campus de Espinardo, P.O. Box 164, 30100 Espinardo-Murcia, Spain
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Castonguay Y, Dubé MP, Cloutier J, Michaud R, Bertrand A, Laberge S. Intron-length polymorphism identifies a Y2K4 dehydrin variant linked to superior freezing tolerance in alfalfa. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2012; 124:809-819. [PMID: 22083355 DOI: 10.1007/s00122-011-1735-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Accepted: 10/14/2011] [Indexed: 05/31/2023]
Abstract
Breeding alfalfa (Medicago sativa L.) with superior freezing tolerance could be accelerated by the identification of molecular markers associated to that trait. Dehydrins are a group of highly hydrophilic proteins that have been related to low temperature tolerance. We previously identified a dehydrin restriction fragment length polymorphism (RFLP) among populations recurrently selected for superior tolerance to freezing (TF). Analysis of crosses between genotypes with (D+) or without (D-) that RFLP revealed a significant impact on freezing tolerance. In this study, we sought to develop a PCR marker for freezing tolerance based on prior evidence of a relationship between size variation in Y(2)K(4) dehydrins and the RFLP. Results confirm the enrichment of Y(2)K(4) sequences of intermediate size (G2 group) in response to recurrent selection and in the D+ progeny. Analysis of genomic sequences revealed significant intron-length polymorphism (ILP) within the G2 group. G2 sequences with a characteristic short intron were more frequently found in D+ genotypes. Amplification using sequence-characterized amplified region (SCAR) primers bordering the intron confirmed an increase in the number of fragments with small introns in the D+ progeny and in the ATF5 population obtained after five cycles of recurrent selection for superior TF within the cultivar Apica (ATF0). Conversely, there was a reduction in the number of fragments with long introns in the D+ progeny and in ATF5 as compared to ATF0. Recurrent selection for superior tolerance to freezing in combination with ILP identified a sequence variant of Y(2)K(4) dehydrins associated to the phenotypic response to selection.
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Affiliation(s)
- Yves Castonguay
- Crops and Soils Research and Development Center, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Quebec, QC, Canada.
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Checker VG, Chhibbar AK, Khurana P. Stress-inducible expression of barley Hva1 gene in transgenic mulberry displays enhanced tolerance against drought, salinity and cold stress. Transgenic Res 2011; 21:939-57. [PMID: 22160463 DOI: 10.1007/s11248-011-9577-8] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Accepted: 11/25/2011] [Indexed: 11/26/2022]
Abstract
Coping with different kinds of biotic and abiotic stresses is the foundation of sustainable agriculture. Although conventional breeding and marker-assisted selection are being employed in mulberry (Morus indica L.) to develop better varieties, nonetheless the longer time periods required for these approaches necessitates the use of precise biotechnological approaches for sustainable agriculture. In an attempt to improve stress tolerance of mulberry, an important plant of the sericulture industry, an encoding late embryogenesis abundant gene from barley (HVA1) was introduced into mulberry plants by Agrobacterium-mediated transformation. Transgenic mulberry with barley Hva1 under a constitutive promoter actin1 was shown to enhance drought and salinity tolerance. Here, we report that overexpression of barley Hva1 also confers cold tolerance in transgenic mulberry. Further, barley Hva1 gene under control of a stress-inducible promoter rd29A can effectively negate growth retardation under non-stress conditions and confer stress tolerance in transgenic mulberry. Transgenic lines display normal morphology to enhanced growth and an increased tolerance against drought, salt and cold conditions as measured by free proline, membrane stability index and PSII activity. Protein accumulation was detected under stress conditions confirming inductive expression of HVA1 in transgenics. Investigations to assess stress tolerance of these plants under field conditions revealed an overall better performance than the non-transgenic plants. Enhanced expression of stress responsive genes such as Mi dnaJ and Mi 2-cysperoxidin suggests that Hva1 can regulate downstream genes associated with providing abiotic stress tolerance. The investigation of transgenic lines presented here demonstrates the acquisition of tolerance against drought, salt and cold stress in plants overexpressing barley Hva1, indicating that Arabidopsis rd29A promoter can function in mulberry.
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Affiliation(s)
- Vibha G Checker
- Department of Plant Molecular Biology, University of Delhi South Campus, Dhaula Kuan, New Delhi, 110021, India
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Vornam B, Gailing O, Derory J, Plomion C, Kremer A, Finkeldey R. Characterisation and natural variation of a dehydrin gene in Quercus petraea (Matt.) Liebl. PLANT BIOLOGY (STUTTGART, GERMANY) 2011; 13:881-887. [PMID: 21973280 DOI: 10.1111/j.1438-8677.2011.00446.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
For the first time in sessile oak [Quercus petraea (Matt.) Liebl.], the isolation and characterisation of a full-length dehydrin gene and its promoter region, as well as its allelic variation in natural populations, is reported. Dehydrins (Dhn) are stress-related genes important for the survival of perennial plants in a seasonal climate. A full-length dehydrin gene (Dhn3) was characterised at the nucleotide level and the protein structure was modelled. Additionally, the allelic variation was analysed in five natural populations of Quercus petraea (Matt.) Liebl. sampled along an altitudinal gradient in the French Pyrenees. The analysed sequences contain typical domains of the K(n) class of dehydrins in the coding region. Also, the 5'untranslated region (promoter) of the gene was amplified, which shows typical motifs essential for drought- and cold-responsive gene expression. Single nucleotide substitutions and indels (insertions/deletions) within the coding region determine large biochemical differences at the protein level. However, only low levels of genetic differentiation between populations from different altitudes were detectable.
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Affiliation(s)
- B Vornam
- Buesgen-Institute, Department of Forest Genetics and Forest Tree Breeding, University of Göttingen, Germany.
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Hanin M, Brini F, Ebel C, Toda Y, Takeda S, Masmoudi K. Plant dehydrins and stress tolerance: versatile proteins for complex mechanisms. PLANT SIGNALING & BEHAVIOR 2011; 6:1503-9. [PMID: 21897131 PMCID: PMC3256378 DOI: 10.4161/psb.6.10.17088] [Citation(s) in RCA: 274] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 06/30/2011] [Indexed: 05/18/2023]
Abstract
Dehydrins (DHNs), or group 2 LEA (Late Embryogenesis Abundant) proteins, play a fundamental role in plant response and adaptation to abiotic stresses. They accumulate typically in maturing seeds or are induced in vegetative tissues following salinity, dehydration, cold, and freezing stress. The generally accepted classification of dehydrins is based on their structural features, such as the presence of conserved sequences, designated as Y, S, and K segments. The K segment representing a highly conserved 15 amino acid motif forming amphiphilic α-helix is especially important since it has been found in all dehydrins. Since more than 20 years, they are thought to play an important protective role during cellular dehydration but their precise function remains unclear. This review outlines the current status of the progress made towards the structural, physico-chemical and functional characterization of plant dehydrins and how these features could be exploited in improving stress tolerance in plants.
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Affiliation(s)
- Moez Hanin
- Laboratory of Plant Protection and Improvement, Centre of Biotechnology of Sfax, Institute of Biotechnology, University of Sfax, Sfax, Tunisia.
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Grivet D, Sebastiani F, Alia R, Bataillon T, Torre S, Zabal-Aguirre M, Vendramin GG, Gonzalez-Martinez SC. Molecular Footprints of Local Adaptation in Two Mediterranean Conifers. Mol Biol Evol 2010; 28:101-16. [DOI: 10.1093/molbev/msq190] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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Rémus-Borel W, Castonguay Y, Cloutier J, Michaud R, Bertrand A, Desgagnés R, Laberge S. Dehydrin variants associated with superior freezing tolerance in alfalfa (Medicago sativa L.). TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2010; 120:1163-74. [PMID: 20039014 DOI: 10.1007/s00122-009-1243-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2009] [Accepted: 12/08/2009] [Indexed: 05/08/2023]
Abstract
A cDNA (msaCIG) encoding a cold-inducible Y(2)K(4) dehydrin in alfalfa (Medicago sativa spp. sativa) was shown to share extensive homology with sequences from other species and subspecies of Medicago. Differences were mainly the result of the occurrence of large indels, amino acids substitutions/deletions and sequence duplications. Using a combination of a bulk segregant analysis and RFLP hybridization, we uncovered an msaCIG polymorphism that increases in frequency in response to recurrent selection for superior freezing tolerance. Progenies from crosses between genotypes with (D+) or without (D-) the polymorphic dehydrin significantly differed in their tolerance to subfreezing temperatures. Based on the msaCIG sequence, we looked for intragenic variations that could be associated to the polymorphism detected on Southern blots. Amplifications with primers targeting the 3' half side of msaCIG revealed fragment size variations between pools of genotypes with (+) or without (-) the polymorphism. Three major groups of amplicons of approximately 370 nt (G1), 330 nt (G2), and 290 nt (G3) were distinguished. The G2 group was more intensively amplified in pools of genotypes with the polymorphic dehydrin and was associated to a superior freezing tolerance phenotype. Sequences analysis revealed that size variation in the 3' half was attributable to the variable occurrence of large indels. Single amino acid substitutions and/or deletions caused major differences in the prediction of the secondary structure of the polypeptides. The identification of dehydrin variants associated to superior freezing tolerance paves the way to the development of functional markers and the fixation of favorable alleles in various genetic backgrounds.
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Affiliation(s)
- Wilfried Rémus-Borel
- Crops and Soils Research and Development Center, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Quebec, QC, G1V-2J3, Canada.
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Muchero W, Diop NN, Bhat PR, Fenton RD, Wanamaker S, Pottorff M, Hearne S, Cisse N, Fatokun C, Ehlers JD, Roberts PA, Close TJ. A consensus genetic map of cowpea [Vigna unguiculata (L) Walp.] and synteny based on EST-derived SNPs. Proc Natl Acad Sci U S A 2009; 106:18159-64. [PMID: 19826088 PMCID: PMC2761239 DOI: 10.1073/pnas.0905886106] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2009] [Indexed: 11/18/2022] Open
Abstract
Consensus genetic linkage maps provide a genomic framework for quantitative trait loci identification, map-based cloning, assessment of genetic diversity, association mapping, and applied breeding in marker-assisted selection schemes. Among "orphan crops" with limited genomic resources such as cowpea [Vigna unguiculata (L.) Walp.] (2n = 2x = 22), the use of transcript-derived SNPs in genetic maps provides opportunities for automated genotyping and estimation of genome structure based on synteny analysis. Here, we report the development and validation of a high-throughput EST-derived SNP assay for cowpea, its application in consensus map building, and determination of synteny to reference genomes. SNP mining from 183,118 ESTs sequenced from 17 cDNA libraries yielded approximately 10,000 high-confidence SNPs from which an Illumina 1,536-SNP GoldenGate genotyping array was developed and applied to 741 recombinant inbred lines from six mapping populations. Approximately 90% of the SNPs were technically successful, providing 1,375 dependable markers. Of these, 928 were incorporated into a consensus genetic map spanning 680 cM with 11 linkage groups and an average marker distance of 0.73 cM. Comparison of this cowpea genetic map to reference legumes, soybean (Glycine max) and Medicago truncatula, revealed extensive macrosynteny encompassing 85 and 82%, respectively, of the cowpea map. Regions of soybean genome duplication were evident relative to the simpler diploid cowpea. Comparison with Arabidopsis revealed extensive genomic rearrangement with some conserved microsynteny. These results support evolutionary closeness between cowpea and soybean and identify regions for synteny-based functional genomics studies in legumes.
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Affiliation(s)
| | - Ndeye N. Diop
- Botany and Plant Sciences, University of California, Riverside, CA 92521
| | - Prasanna R. Bhat
- Botany and Plant Sciences, University of California, Riverside, CA 92521
| | - Raymond D. Fenton
- Botany and Plant Sciences, University of California, Riverside, CA 92521
| | - Steve Wanamaker
- Botany and Plant Sciences, University of California, Riverside, CA 92521
| | - Marti Pottorff
- Botany and Plant Sciences, University of California, Riverside, CA 92521
| | - Sarah Hearne
- The International Institute of Tropical Agriculture, Oyo Road, PMB 5320, Ibadan, Nigeria; and
| | - Ndiaga Cisse
- Senegalese Institute of Agricultural Research, Bambey, Senegal
| | - Christian Fatokun
- The International Institute of Tropical Agriculture, Oyo Road, PMB 5320, Ibadan, Nigeria; and
| | - Jeffrey D. Ehlers
- Botany and Plant Sciences, University of California, Riverside, CA 92521
| | | | - Timothy J. Close
- Botany and Plant Sciences, University of California, Riverside, CA 92521
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Mehta PA, Rebala KC, Venkataraman G, Parida A. A diurnally regulated dehydrin from Avicennia marina that shows nucleo-cytoplasmic localization and is phosphorylated by Casein kinase II in vitro. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2009; 47:701-9. [PMID: 19398349 DOI: 10.1016/j.plaphy.2009.03.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Revised: 03/16/2009] [Accepted: 03/19/2009] [Indexed: 05/02/2023]
Abstract
Dehydrins have a key role in protecting plants from dehydration stress. We report here the isolation of two cDNAs coding for the same dehydrin, AmDHN1 and AmDHN1a from salt stressed leaves of Avicennia marina (Forsk.) Vierh. by EST library screening. AmDHN1 was found to contain a retained intron that was absent in AmDHN1a. AmDHN1 expression in the context of various environmental stresses was investigated. In leaves, AmDHN1 shows a diurnal pattern of regulation and is induced only by mannitol application. In roots, AmDHN1 is rapidly induced by salinity (NaCl) and dehydration stress (PEG and mannitol). A fragment of 795 bp corresponding to the 5' upstream region of AmDHN1 was isolated by TAIL-PCR. In silico analysis of this sequence reveals the presence of putative stress regulatory elements (ABRE, DRE, MYB and MYC binding sequences). Putative phosphorylation sites for Casein kinase II were identified in the AmDHN1a ORF. In vitro phosphorylation of Escherichia coli expressed Trx-AmDHN1a by Casein kinase II was observed that was reversed by Shrimp Alkaline Phosphatase treatment. A putative nuclear targeting domain was identified in the translated AmDHN1a ORF and stably transformed AmDHNIa-GFP was found to show nucleo-cytoplasmic localization in tobacco guard cells. As observed for maize Rab 17, the phosphorylation of AmDHN1a may contribute to its nuclear localization.
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Affiliation(s)
- Preeti A Mehta
- Dept. of Biotechnology, Stella Maris College, 17, Cathedral Rd, Chennai, TN 600086, India
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Koag MC, Wilkens S, Fenton RD, Resnik J, Vo E, Close TJ. The K-segment of maize DHN1 mediates binding to anionic phospholipid vesicles and concomitant structural changes. PLANT PHYSIOLOGY 2009; 150:1503-14. [PMID: 19439573 PMCID: PMC2705017 DOI: 10.1104/pp.109.136697] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Accepted: 05/06/2009] [Indexed: 05/18/2023]
Abstract
Dehydrins (DHNs; late embryogenesis abundant D11 family) are a family of intrinsically unstructured plant proteins that accumulate in the late stages of seed development and in vegetative tissues subjected to water deficit, salinity, low temperature, or abscisic acid treatment. We demonstrated previously that maize (Zea mays) DHNs bind preferentially to anionic phospholipid vesicles; this binding is accompanied by an increase in alpha-helicity of the protein, and adoption of alpha-helicity can be induced by sodium dodecyl sulfate. All DHNs contain at least one "K-segment," a lysine-rich 15-amino acid consensus sequence. The K-segment is predicted to form a class A2 amphipathic alpha-helix, a structural element known to interact with membranes and proteins. Here, three K-segment deletion proteins of maize DHN1 were produced. Lipid vesicle-binding assays revealed that the K-segment is required for binding to anionic phospholipid vesicles, and adoption of alpha-helicity of the K-segment accounts for most of the conformational change of DHNs upon binding to anionic phospholipid vesicles or sodium dodecyl sulfate. The adoption of structure may help stabilize cellular components, including membranes, under stress conditions.
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Affiliation(s)
- Myong-Chul Koag
- Graduate Program in Biochemistry and Molecular Biology, University of California, Riverside, California 92521-0124, USA
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31
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Koag MC, Wilkens S, Fenton RD, Resnik J, Vo E, Close TJ. The K-segment of maize DHN1 mediates binding to anionic phospholipid vesicles and concomitant structural changes. PLANT PHYSIOLOGY 2009. [PMID: 19439573 DOI: 10.1104/pp109136697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Dehydrins (DHNs; late embryogenesis abundant D11 family) are a family of intrinsically unstructured plant proteins that accumulate in the late stages of seed development and in vegetative tissues subjected to water deficit, salinity, low temperature, or abscisic acid treatment. We demonstrated previously that maize (Zea mays) DHNs bind preferentially to anionic phospholipid vesicles; this binding is accompanied by an increase in alpha-helicity of the protein, and adoption of alpha-helicity can be induced by sodium dodecyl sulfate. All DHNs contain at least one "K-segment," a lysine-rich 15-amino acid consensus sequence. The K-segment is predicted to form a class A2 amphipathic alpha-helix, a structural element known to interact with membranes and proteins. Here, three K-segment deletion proteins of maize DHN1 were produced. Lipid vesicle-binding assays revealed that the K-segment is required for binding to anionic phospholipid vesicles, and adoption of alpha-helicity of the K-segment accounts for most of the conformational change of DHNs upon binding to anionic phospholipid vesicles or sodium dodecyl sulfate. The adoption of structure may help stabilize cellular components, including membranes, under stress conditions.
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Affiliation(s)
- Myong-Chul Koag
- Graduate Program in Biochemistry and Molecular Biology, University of California, Riverside, California 92521-0124, USA
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32
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Hara M, Shinoda Y, Tanaka Y, Kuboi T. DNA binding of citrus dehydrin promoted by zinc ion. PLANT, CELL & ENVIRONMENT 2009; 32:532-41. [PMID: 19183287 DOI: 10.1111/j.1365-3040.2009.01947.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Dehydrins are hydrophilic proteins that accumulate during embryogenesis and osmotic stress responses in plants. Here, we report an interaction between citrus dehydrin Citrus unshiu cold-regulated 15 kDa protein (CuCOR15) and DNA. Binding of CuCOR15 to DNA was detected by an electrophoretic mobility shift assay, a filter-binding assay and Southwestern blotting. The binding was stimulated by physiological concentrations of Zn2+, but little stimulation occurred when other divalent cations, such as Mg2+, Ca2+, Mn2+, Ni2+ and Cu2+, were substituted for Zn2+. Ethylenediaminetetraacetic acid cancelled the Zn2+-stimulated binding. A binding curve and competitor experiments suggested that the DNA binding of CuCOR15 exhibited low affinity and non-specificity. Moreover, tRNA competed with the DNA binding. Histidine-rich domains and a polylysine segment-containing domain participated in the DNA binding. These results suggest that CuCOR15 can interact with DNA, and also RNA, in the presence of Zn2+. Dehydrin may protect nucleic acids in plant cells during seed maturation and stress responses.
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Affiliation(s)
- Masakazu Hara
- Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.
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Reyes JL, Campos F, Wei H, Arora R, Yang Y, Karlson DT, Covarrubias AA. Functional dissection of hydrophilins during in vitro freeze protection. PLANT, CELL & ENVIRONMENT 2008; 31:1781-90. [PMID: 18761701 DOI: 10.1111/j.1365-3040.2008.01879.x] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
In plants, Late Embryogenesis Abundant (LEA) proteins typically accumulate in response to low water availability conditions imposed during development or by the environment. Analogous proteins in other organisms are induced when exposed to stress conditions. Most of this diverse set of proteins can be grouped according to properties such as high hydrophilicity and high content of glycine or other small amino acids in what we have termed hydrophilins. Previously, we showed that hydrophilins protect enzyme activities in vitro from low water availability effects. Here, we demonstrate that hydrophilins can also protect enzyme activities from the adverse effects induced by freeze-thaw cycles in vitro. We monitored conformational changes induced by freeze-thaw on the enzyme lactate dehydrogenase (LDH) using the fluorophore 1-anilinonaphthalene-8-sulfonate (ANS). Hydrophilin addition prevents enzyme inactivation and this effect is reflected in changes in the ANS-fluorescence levels determined for LDH. We further show that for selected plant hydrophilins, removal of certain conserved domains affects their protecting capabilities. Thus, we propose that hydrophilins, and in particular specific protein domains, have a role in protecting cell components from the adverse effects caused by low water availability such as those present during freezing conditions by preventing deleterious changes in protein secondary and tertiary structure.
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Affiliation(s)
- José L Reyes
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Mor. 62250, México
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Battaglia M, Olvera-Carrillo Y, Garciarrubio A, Campos F, Covarrubias AA. The enigmatic LEA proteins and other hydrophilins. PLANT PHYSIOLOGY 2008. [PMID: 18772351 DOI: 10.1104/pp108120725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Affiliation(s)
- Marina Battaglia
- Departamento de Biología Molecular de Plantas , Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62250, Mexico
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Battaglia M, Olvera-Carrillo Y, Garciarrubio A, Campos F, Covarrubias AA. The enigmatic LEA proteins and other hydrophilins. PLANT PHYSIOLOGY 2008; 148:6-24. [PMID: 18772351 PMCID: PMC2528095 DOI: 10.1104/pp.108.120725] [Citation(s) in RCA: 496] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Accepted: 07/08/2008] [Indexed: 05/17/2023]
Affiliation(s)
- Marina Battaglia
- Departamento de Biología Molecular de Plantas , Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62250, Mexico
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Association genetics in Pinus taeda L. II. Carbon isotope discrimination. Heredity (Edinb) 2008; 101:19-26. [PMID: 18478029 DOI: 10.1038/hdy.2008.21] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Dissection of complex traits that influence fitness is not only a central topic in evolutionary research but can also assist breeding practices for economically important plant species, such as loblolly pine (Pinus taeda L). In this study, 46 single nucleotide polymorphisms (SNPs) from 41 disease and abiotic stress-inducible genes were tested for their genetic association with carbon isotope discrimination (CID), a time-integrated trait measure of stomatal conductance. A family-based approach to detect genotype/phenotype genetic association was developed for the first time in plants by applying the quantitative transmission disequilibrium test on an association population of 961 clones from 61 families (adopted from previous breeding programs) evaluated for phenotypic expression of CID at two sites. Two particularly promising candidates for their genetic effects on CID are: dhn-1, involved in stabilization of cell structures, and lp5-like, a glycine rich protein putatively related to cell wall reinforcement proteins, both of which were shown in previous studies to be water-deficit inducible. Moreover, association in lp5-like involves a nonsynonymous mutation in linkage disequilibrium with two other nonsynonymous polymorphisms that could, by acting together, enhance overall phenotypic effects. This study highlights the complexity of dissecting CID traits and provides insights for designing second-generation association studies based on candidate gene approaches in forest trees.
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Kovacs D, Kalmar E, Torok Z, Tompa P. Chaperone activity of ERD10 and ERD14, two disordered stress-related plant proteins. PLANT PHYSIOLOGY 2008; 147:381-90. [PMID: 18359842 PMCID: PMC2330285 DOI: 10.1104/pp.108.118208] [Citation(s) in RCA: 277] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Accepted: 03/10/2008] [Indexed: 05/18/2023]
Abstract
ERD10 and ERD14 (for early response to dehydration) proteins are members of the dehydrin family that accumulate in response to abiotic environmental stresses, such as high salinity, drought, and low temperature, in Arabidopsis (Arabidopsis thaliana). Whereas these proteins protect cells against the consequences of dehydration, the exact mode(s) of their action remains poorly understood. Here, detailed evidence is provided that ERD10 and ERD14 belong to the family of intrinsically disordered proteins, and it is shown in various assays that they act as chaperones in vitro. ERD10 and ERD14 are able to prevent the heat-induced aggregation and/or inactivation of various substrates, such as lysozyme, alcohol dehydrogenase, firefly luciferase, and citrate synthase. It is also demonstrated that ERD10 and ERD14 bind to acidic phospholipid vesicles without significantly affecting membrane fluidity. Membrane binding is strongly influenced by ionic strength. Our results show that these intrinsically disordered proteins have chaperone activity of rather wide substrate specificity and that they interact with phospholipid vesicles through electrostatic forces. We suggest that these findings provide the rationale for the mechanism of how these proteins avert the adverse effects of dehydration stresses.
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Affiliation(s)
- Denes Kovacs
- Institute of Enzymology, Biological Research Center, Hungarian Academy of Sciences, Budapest, Hungary H-1113
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Pulla RK, Kim YJ, Kim MK, Senthil KS, In JG, Yang DC. Isolation of a novel dehydrin gene from Codonopsis lanceolata and analysis of its response to abiotic stresses. BMB Rep 2008; 41:338-43. [DOI: 10.5483/bmbrep.2008.41.4.338] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Zhuang Y, Ren G, Yue G, Li Z, Qu X, Hou G, Zhu Y, Zhang J. Effects of water-deficit stress on the transcriptomes of developing immature ear and tassel in maize. PLANT CELL REPORTS 2007; 26:2137-47. [PMID: 17668218 DOI: 10.1007/s00299-007-0419-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2007] [Revised: 07/14/2007] [Accepted: 07/16/2007] [Indexed: 05/16/2023]
Abstract
Water-deficit stress during meiosis is one of the most serious threats to crop production. To elucidate the mechanisms of the response to water-deficit stress in the reproductive organs of maize, we have characterized the changes in transcription that occur during meiosis in the tassels and floret formation in the ears following water deficit stress. We used oligo microarray analysis, which included 57,452 transcripts representing more than 30,000 identifiable unique maize genes, and combined this with reverse Northern blot analysis. After 7 days of stress, immature tassels and ears differed considerably in their transcriptional responses, and the majority of changes were organ specific. In the tassels, 1,513 transcripts were differentially expressed (by threefold or greater) with 62% of these being upregulated by water stress. In the ears, 202 transcripts were differentially expressed with 95% being upregulated by water stress. Most of these transcripts have not been previously reported to be associated with water stress. Only 74 of these transcripts were co-regulated in the two organs. The stress-regulated transcripts are involved in a broad range of cellular and biochemical activities. The most notable may function in carbohydrate metabolism, particular in sucrose, trehalose and raffinose metabolism, and in cell wall metabolism in the tassels. Collectively, these data suggest that the transcripts differentially expressed during reproductive organic development may represent candidate genes for dissecting molecular mechanism of this important biological process in response to water-deficit stress.
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Affiliation(s)
- Yunlong Zhuang
- School of Life Science, Shandong University, Jinan, Shandong, China
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Abstract
Research into late embryogenesis abundant (LEA) proteins has been ongoing for more than 20 years but, although there is a strong association of LEA proteins with abiotic stress tolerance particularly dehydration and cold stress, for most of that time, their function has been entirely obscure. After their initial discovery in plant seeds, three major groups (numbered 1, 2 and 3) of LEA proteins have been described in a range of different plants and plant tissues. Homologues of groups 1 and 3 proteins have also been found in bacteria and in certain invertebrates. In this review, we present some new data, survey the biochemistry, biophysics and bioinformatics of the LEA proteins and highlight several possible functions. These include roles as antioxidants and as membrane and protein stabilisers during water stress, either by direct interaction or by acting as molecular shields. Along with other hydrophilic proteins and compatible solutes, LEA proteins might also serve as "space fillers" to prevent cellular collapse at low water activities. This multifunctional capacity of the LEA proteins is probably attributable in part to their structural plasticity, as they are largely lacking in secondary structure in the fully hydrated state, but can become more folded during water stress and/or through association with membrane surfaces. The challenge now facing researchers investigating these enigmatic proteins is to make sense of the various in vitro defined functions in the living cell: Are the LEA proteins truly multi-talented, or are they still just misunderstood?
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Tunnacliffe A, Wise MJ. The continuing conundrum of the LEA proteins. Naturwissenschaften 2007; 94:791-812. [PMID: 17479232 DOI: 10.1007/s00114-007-0254-y] [Citation(s) in RCA: 462] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2007] [Revised: 03/27/2007] [Accepted: 04/11/2007] [Indexed: 11/25/2022]
Abstract
Research into late embryogenesis abundant (LEA) proteins has been ongoing for more than 20 years but, although there is a strong association of LEA proteins with abiotic stress tolerance particularly dehydration and cold stress, for most of that time, their function has been entirely obscure. After their initial discovery in plant seeds, three major groups (numbered 1, 2 and 3) of LEA proteins have been described in a range of different plants and plant tissues. Homologues of groups 1 and 3 proteins have also been found in bacteria and in certain invertebrates. In this review, we present some new data, survey the biochemistry, biophysics and bioinformatics of the LEA proteins and highlight several possible functions. These include roles as antioxidants and as membrane and protein stabilisers during water stress, either by direct interaction or by acting as molecular shields. Along with other hydrophilic proteins and compatible solutes, LEA proteins might also serve as "space fillers" to prevent cellular collapse at low water activities. This multifunctional capacity of the LEA proteins is probably attributable in part to their structural plasticity, as they are largely lacking in secondary structure in the fully hydrated state, but can become more folded during water stress and/or through association with membrane surfaces. The challenge now facing researchers investigating these enigmatic proteins is to make sense of the various in vitro defined functions in the living cell: Are the LEA proteins truly multi-talented, or are they still just misunderstood?
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Affiliation(s)
- Alan Tunnacliffe
- Institute of Biotechnology, University of Cambridge, Cambridge, UK.
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Mowla SB, Cuypers A, Driscoll SP, Kiddle G, Thomson J, Foyer CH, Theodoulou FL. Yeast complementation reveals a role for an Arabidopsis thaliana late embryogenesis abundant (LEA)-like protein in oxidative stress tolerance. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2006; 48:743-56. [PMID: 17092320 DOI: 10.1111/j.1365-313x.2006.02911.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A functional cloning approach using the oxidant-sensitive yeast mutant, Deltayap1, was employed to identify plant genes involved in tolerance of oxidative stress. In this screen, we identified an Arabidopsis late embryogenesis-abundant (LEA)-like protein, AtLEA5, which increased the tolerance of Deltayap1 cells to the oxidants H(2)O(2), diamide, menadione and tert-butyl hydroperoxide. Unlike canonical LEAs, AtLEA5 is constitutively expressed in roots and reproductive organs but not in seeds. In leaves of short-day grown plants, AtLEA5 transcripts exhibited a diurnal pattern of regulation, where transcripts were repressed in the light and abundant in the dark. Expression of AtLEA5 in leaves was induced by oxidants, ABA and dehydration. Use of abi1-1 (ABA-insensitive) and aba1-1 (ABA-deficient) Arabidopsis mutants indicated that drought induction of AtLEA5 required ABA synthesis but was independent of the ABI1 gene product. Abscisic acid and H(2)O(2) induction of AtLEA5 was also independent of the OXI1 protein kinase. Constitutive overexpression of AtLEA5 resulted in increased root growth and shoot biomass, both in optimal conditions and under H(2)O(2) stress. However, in comparison with wild type, photosynthesis in overexpressing plants was more susceptible to drought. These features suggest that AtLEA5 has a unique function among LEA proteins in that it plays a specific role in protection against oxidative stress involving decreased photosynthesis. This protein functions as part of a complex network of defences that contribute to robustness of plants under stress by minimizing the negative effects of oxidation.
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Affiliation(s)
- Shaheen B Mowla
- Crop Performance and Improvement Division, Rothamsted Research, Harpenden, Herts AL5 2JQ, UK
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Rorat T. Plant dehydrins--tissue location, structure and function. Cell Mol Biol Lett 2006; 11:536-56. [PMID: 16983453 PMCID: PMC6275985 DOI: 10.2478/s11658-006-0044-0] [Citation(s) in RCA: 191] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2006] [Accepted: 06/28/2006] [Indexed: 11/21/2022] Open
Abstract
Dehydrins (DHNs) are part of a large group of highly hydrophilic proteins known as LEA (Late Embryogenesis Abundant). They were originally identified as group II of the LEA proteins. The distinctive feature of all DHNs is a conserved, lysine-rich 15-amino acid domain, EKKGIMDKIKEKLPG, named the K-segment. It is usually present near the C-terminus. Other typical dehydrin features are: a track of Ser residues (the S-segment); a consensus motif, T/VDEYGNP (the Y-segment), located near the N-terminus; and less conserved regions, usually rich in polar amino acids (the Phi-segments). They do not display a well-defined secondary structure. The number and order of the Y-, S-and K-segments define different DHN sub-classes: Y(n)SK(n), Y(n)Kn, SK(n), K(n) and K(n)S. Dehydrins are distributed in a wide range of organisms including the higher plants, algae, yeast and cyanobacteria. They accumulate late in embryogenesis, and in nearly all the vegetative tissues during normal growth conditions and in response to stress leading to cellular dehydration (e.g. drought, low temperature and salinity). DHNs are localized in different cell compartments, such as the cytosol, nucleus, mitochondria, vacuole, and the vicinity of the plasma membrane; however, they are primarily localized to the cytoplasm and nucleus. The precise function of dehydrins has not been established yet, but in vitro experiments revealed that some DHNs (YSK(n)-type) bind to lipid vesicles that contain acidic phospholipids, and others (K(n)S) were shown to bind metals and have the ability to scavenge hydroxyl radicals [Asghar, R. et al. Protoplasma 177 (1994) 87-94], protect lipid membranes against peroxidation or display cryoprotective activity towards freezing-sensitive enzymes. The SK(n)-and K-type seem to be directly involved in cold acclimation processes. The main question arising from the in vitro findings is whether each DHN structural type could possess a specific function and tissue distribution. Much recent in vitro data clearly indicates that dehydrins belonging to different subclasses exhibit distinct functions.
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Xiao H, Nassuth A. Stress- and development-induced expression of spliced and unspliced transcripts from two highly similar dehydrin 1 genes in V. riparia and V. vinifera. PLANT CELL REPORTS 2006; 25:968-77. [PMID: 16552595 DOI: 10.1007/s00299-006-0151-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Revised: 02/05/2006] [Accepted: 02/19/2006] [Indexed: 05/02/2023]
Abstract
Dehydrins are proteins that accumulate in vegetative tissues subjected to various dehydrating stress conditions such as cold, drought, and salinity and in seeds at later stages of embryogenesis. Here, we report on two highly identical dehydrin genes, DHN1a and DHN1b, in wild and cultivated grapes, Vitis riparia and Vitis vinifera, and their expression in different tissues and under different environmental conditions. The two genes and their transcripts can easily be distinguished by RT-PCR because DHN1b has an 18 bp deletion compared to DHN1a. V. riparia expressed only DHN1a; V. vinifera expressed both DHN1a and DHN1b. Spliced transcripts, DHN1-S, encoding a putative YSK(2)-type dehydrin were present in low amounts in control leaves, but in high amounts in buds and seeds. Unspliced transcripts, DHN1-U, accumulated to high levels in buds and seeds. Cold, drought, and ABA treatment increased accumulation of both DHN1-S and DHN1-U in leaves, whereas short-day treatment increased only DHN1-S. The possible relation of these results with the difference in freezing stress tolerance between V. riparia and V. vinifera is discussed.
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Affiliation(s)
- Huogen Xiao
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON, Canada
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Kami J, Poncet V, Geffroy V, Gepts P. Development of four phylogenetically-arrayed BAC libraries and sequence of the APA locus in Phaseolus vulgaris. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2006; 112:987-98. [PMID: 16404584 DOI: 10.1007/s00122-005-0201-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2005] [Accepted: 11/30/2005] [Indexed: 05/06/2023]
Abstract
The APA family of seed proteins consists of three subfamilies, in evolutionary order of hypothesized appearance: phytohaemagglutinins (PHA), alpha-amylase inhibitors (alphaAI), and arcelins (ARL). The APA family plays a defensive role against mammalian and insect seed predation in common bean (Phaseolus vulgaris L.). The main locus (APA) for this gene family is situated on linkage group B4. In order to elucidate the pattern of duplication and diversification at this locus, we developed a BAC library in each of four different Phaseolus genotypes that represent presumptive steps in the evolutionary diversification of the APA family. Specifically, BAC libraries were established in one P. lunatus (cv. 'Henderson: PHA+ alphaAI- ARL-) and three P. vulgaris accessions (presumed ancestral wild G21245 from northern Peru: PHA+ alphaAI+ ARL-; Mesoamerican wild G02771: PHA+ alphaAI+ ARL+; and Mesoamerican breeding line BAT93: PHA+ alphaAI+ ARL-). The libraries were constructed after HindIII digestion of high molecular weight DNA, obtained with a novel nuclei isolation procedure. The frequency of empty or cpDNA-sequence-containing clones in all libraries is low (generally <1%). The Henderson, G21245, and G02771 libraries have a 10x genome coverage, whereas the BAT93 library has a 20x coverage to allow further, more detailed genomic analysis of the bean genome. The complete sequence of a 155 kbp-insert clone of the G02771 library revealed six sequences belonging to the APA gene family, including members of the three subfamilies, as hypothesized. The different subfamilies were interspersed with retrotransposon sequences. In addition, other sequences were identified with similarity to chloroplast DNA, a dehydrin gene, and the Arabidopsis flowering D locus. Linkage between the dehydrin gene and the D1711 RFLP marker identifies a potential syntenic region between parts of common bean linkage group B4 and cowpea linkage group 2.
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Affiliation(s)
- James Kami
- Department of Plant Sciences, Section of Crop and Ecosystem Sciences, University of California, Mailstop 1, 1 Shields Avenue, Davis, CA 95616-8780, USA
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Tondelli A, Francia E, Barabaschi D, Aprile A, Skinner JS, Stockinger EJ, Stanca AM, Pecchioni N. Mapping regulatory genes as candidates for cold and drought stress tolerance in barley. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2006; 112:445-54. [PMID: 16315028 DOI: 10.1007/s00122-005-0144-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2005] [Accepted: 10/24/2005] [Indexed: 05/05/2023]
Abstract
Cereal crop yield is greatly affected in many growing areas by abiotic stresses, mainly low temperature and drought. In order to find candidates for the tolerance genes for these stresses, 13 genes encoding for transcription factors and upstream regulators were screened by amplification and SSCP on six parental genotypes of three barley mapping populations ('Nure' x 'Tremois', 'Proctor' x 'Nudinka', and 'Steptoe' x 'Morex'), and mapped as newly developed STS, SNP, and SSCP markers. A new consensus function map was then drawn using the three maps above, including 16 regulatory candidate genes (CGs). The positions of barley cold and drought tolerance quantitative trait loci (QTLs) presently described in the literature were added to the consensus map to find positional candidates from among the mapped genes. A cluster of six HvCBF genes co-mapped with the Fr-H2 cold tolerance QTL, while no QTLs for the same trait were positioned on chromosome 7H, where two putative barley regulators of CBF expression, ICE1 and FRY1, found by homology search, were mapped in this work. These observations suggest that CBF gene(s) themselves, rather than their two regulators, are at present the best candidates for cold tolerance. Four out of 12 drought tolerance QTLs of the consensus map are associated with regulatory CGs, on chromosomes 2H, 5H, and 7H, and two QTLs with effector genes, on chromosomes 5H and 6H. The results obtained could be used to guide MAS applications, allowing introduction into an ideal genotype of favourable alleles of tolerance QTLs.
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Affiliation(s)
- A Tondelli
- CRA Istituto Sperimentale per la Cerealicoltura, Sezione di Fiorenzuola d'Arda (PC), 29017 Fiorenzuola d'Arda, Italy
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48
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Tondelli A, Francia E, Barabaschi D, Aprile A, Skinner JS, Stockinger EJ, Stanca AM, Pecchioni N. Mapping regulatory genes as candidates for cold and drought stress tolerance in barley. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2005. [PMID: 16315028 DOI: 10.1007/s00122‐005‐0144‐7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Cereal crop yield is greatly affected in many growing areas by abiotic stresses, mainly low temperature and drought. In order to find candidates for the tolerance genes for these stresses, 13 genes encoding for transcription factors and upstream regulators were screened by amplification and SSCP on six parental genotypes of three barley mapping populations ('Nure' x 'Tremois', 'Proctor' x 'Nudinka', and 'Steptoe' x 'Morex'), and mapped as newly developed STS, SNP, and SSCP markers. A new consensus function map was then drawn using the three maps above, including 16 regulatory candidate genes (CGs). The positions of barley cold and drought tolerance quantitative trait loci (QTLs) presently described in the literature were added to the consensus map to find positional candidates from among the mapped genes. A cluster of six HvCBF genes co-mapped with the Fr-H2 cold tolerance QTL, while no QTLs for the same trait were positioned on chromosome 7H, where two putative barley regulators of CBF expression, ICE1 and FRY1, found by homology search, were mapped in this work. These observations suggest that CBF gene(s) themselves, rather than their two regulators, are at present the best candidates for cold tolerance. Four out of 12 drought tolerance QTLs of the consensus map are associated with regulatory CGs, on chromosomes 2H, 5H, and 7H, and two QTLs with effector genes, on chromosomes 5H and 6H. The results obtained could be used to guide MAS applications, allowing introduction into an ideal genotype of favourable alleles of tolerance QTLs.
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Affiliation(s)
- A Tondelli
- CRA Istituto Sperimentale per la Cerealicoltura, Sezione di Fiorenzuola d'Arda (PC), 29017 Fiorenzuola d'Arda, Italy
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Alonso-Blanco C, Gomez-Mena C, Llorente F, Koornneef M, Salinas J, Martínez-Zapater JM. Genetic and molecular analyses of natural variation indicate CBF2 as a candidate gene for underlying a freezing tolerance quantitative trait locus in Arabidopsis. PLANT PHYSIOLOGY 2005; 139:1304-12. [PMID: 16244146 PMCID: PMC1283767 DOI: 10.1104/pp.105.068510] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Natural variation for freezing tolerance is a major component of adaptation and geographic distribution of plant species. However, little is known about the genes and molecular mechanisms that determine its naturally occurring diversity. We have analyzed the intraspecific freezing tolerance variation existent between two geographically distant accessions of Arabidopsis (Arabidopsis thaliana), Cape Verde Islands (Cvi) and Landsberg erecta (Ler). They differed in their freezing tolerance before and after cold acclimation, as well as in the cold acclimation response in relation to photoperiod conditions. Using a quantitative genetic approach, we found that freezing tolerance differences after cold acclimation were determined by seven quantitative trait loci (QTL), named FREEZING TOLERANCE QTL 1 (FTQ1) to FTQ7. FTQ4 was the QTL with the largest effect detected in two photoperiod conditions, while five other FTQ loci behaved as photoperiod dependent. FTQ4 colocated with the tandem repeated genes C-REPEAT BINDING FACTOR 1 (CBF1), CBF2, and CBF3, which encode transcriptional activators involved in the cold acclimation response. The low freezing tolerance of FTQ4-Cvi alleles was associated with a deletion of the promoter region of Cvi CBF2, and with low RNA expression of CBF2 and of several CBF target genes. Genetic complementation of FTQ4-Cvi plants with a CBF2-Ler transgene suggests that such CBF2 allelic variation is the cause of CBF2 misexpression and the molecular basis of FTQ4.
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Affiliation(s)
- Carlos Alonso-Blanco
- Departamento de Genética Molecular de Plantas, Centro Nacional de Biotecnología , Cantoblanco, 28049 Madrid, Spain.
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Hara M, Fujinaga M, Kuboi T. Metal binding by citrus dehydrin with histidine-rich domains. JOURNAL OF EXPERIMENTAL BOTANY 2005; 56:2695-703. [PMID: 16131509 DOI: 10.1093/jxb/eri262] [Citation(s) in RCA: 144] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Dehydrins are hydrophilic proteins that are responsive to osmotic stress, such as drought, cold, and salinity in plants. Although they have been hypothesized to stabilize macromolecules in stressed cells, their functions are not fully understood. Citrus dehydrin, which accumulates mainly in response to cold stress, enhances cold tolerance in transgenic tobacco by reducing lipid peroxidation. It has been demonstrated that citrus dehydrin scavenges hydroxyl radicals. In this study, the metal binding of citrus dehydrin is reported and the specific domain responsible is identified. The metal binding property of citrus dehydrin was tested using immobilized metal ion affinity chromatography (IMAC). Fe3+, Co2+, Ni2+, Cu2+, and Zn2+ bound to citrus dehydrin, but Mg2+, Ca2+, and Mn2+ did not. Among the bound metals, the highest affinity was detected for Cu(2+)-dehydrin binding, which showed a dissociation constant of 1.6 microM. Citrus dehydrin was able to bind up to 16 Cu2+ ions. IMAC indicated that His residues contributed to Cu(2+)-dehydrin binding. The amino acid sequence of CuCOR15 was divided into five domains, of which domain 1 bound Cu2+ most strongly. One portion of domain 1, HKGEHHSGDHH, was the core sequence for the binding. These results suggest that citrus dehydrin binds metals using a specific sequence containing His. Since citrus dehydrin is a radical-scavenging protein, it may reduce metal toxicity in plant cells under water-stressed conditions.
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Affiliation(s)
- Masakazu Hara
- Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan.
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