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Wang F, Xu H, Zhang L, Shi Y, Song Y, Wang X, Cai Q, He W, Xie H, Zhang J. The lipoxygenase OsLOX10 affects seed longevity and resistance to saline-alkaline stress during rice seedlings. PLANT MOLECULAR BIOLOGY 2023; 111:415-428. [PMID: 36867321 PMCID: PMC10089987 DOI: 10.1007/s11103-023-01334-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Accepted: 01/15/2023] [Indexed: 06/19/2023]
Abstract
Prolonged storage of rice seeds can lead to a decrease in seed vigor and seedling quality. The Lipoxygenase (LOX) gene family is widely distributed in plants, and LOX activity is closely related to seed viability and stress tolerance. In this study, the lipoxygenase OsLOX10 gene from the 9-lipoxygenase metabolic pathway was cloned from rice, and its roles in determining seed longevity and tolerance to saline-alkaline stress caused by Na2CO3 in rice seedlings were mainly investigated. CRISPR/Cas9 knockout of OsLOX10 increased seed longevity compared with the wild-type and OsLOX10 overexpression lines in response to artificial aging. The expression levels of other 9-lipoxygenase metabolic pathway related genes, such as LOX1, LOX2 and LOX3, were increased in the LOX10 overexpression lines. Quantitative real-time PCR and histochemical staining analysis showed that the expression of LOX10 was highest in seed hulls, anthers and the early germinating seeds. KI-I2 staining of starch showed that LOX10 could catalyze the degradation of linoleic acid. Furthermore, we found that the transgenic lines overexpressing LOX10 showed better tolerance to saline-alkaline stress than the wild-type and knockout mutant lines. Overall, our study demonstrated that the knockout LOX10 mutant increased seed longevity, whereas overexpression of LOX10 enhanced tolerance to saline-alkaline stress in rice seedlings.
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Affiliation(s)
- Fuxiang Wang
- College of Agriculture, Fujian Agriculture and Forestry University, 350002, Fuzhou, China
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Huibin Xu
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Ling Zhang
- College of Agriculture, Fujian Agriculture and Forestry University, 350002, Fuzhou, China
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Yunrui Shi
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Yu Song
- College of Agriculture, Fujian Agriculture and Forestry University, 350002, Fuzhou, China
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Xinyue Wang
- College of Agriculture, Fujian Agriculture and Forestry University, 350002, Fuzhou, China
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Qiuhua Cai
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Wei He
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Huaan Xie
- College of Agriculture, Fujian Agriculture and Forestry University, 350002, Fuzhou, China
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China
| | - Jianfu Zhang
- College of Agriculture, Fujian Agriculture and Forestry University, 350002, Fuzhou, China.
- Rice Research Institute, Fujian Academy of Agricultural Sciences, 350018, Fuzhou, China.
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops/Key Laboratory of Germplasm Innovation and Molecular Breeding of Hybrid Rice for South China, Incubator of National Key Laboratory of Germplasm Innovation and Molecular Breeding between Fujian and Ministry of Sciences and Technology/Fuzhou Branch, National Rice Improvement Center of China/Fujian Engineering Laboratory of Crop Molecular Breeding/Fujian Key Laboratory of Rice Molecular Breeding, Ministry of Agriculture and Affairs, 350003, Fuzhou, China.
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Wang K, He J, Zhao N, Zhao Y, Qi F, Fan F, Wang Y. Effects of melatonin on growth and antioxidant capacity of naked oat ( Avena nuda L) seedlings under lead stress. PeerJ 2022. [DOI: 10.7717/peerj.13978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Melatonin (MT) plays an important role in plant response to abiotic stress. In recent years, lead (Pb) pollution has seriously affected the living environment of plants. In this study, we applied two different concentrations of MT to naked oat seedlings under Pb stress to explore the effect of MT on naked oat seedlings under Pb pollution. The results showed that Pb stress seriously inhibited the growth and development of naked oat seedlings, which was alleviated by MT. MT could increase the soluble protein content and decrease the proline content of naked oat seedlings to maintain the osmotic balance of naked oat seedlings. The application of MT could accelerate the removal of reactive oxygen species (ROS) and improve the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), so as to maintain the redox balance in naked oat seedlings. Exogenous melatonin could significantly increase the chlorophyll content of naked oat seedlings under Pb treatment, so as to improve the photosynthesis efficiency of naked oat seedlings. MT could also remarkably up regulate the expression of the genes of LOX, POX and Asmap1, and affect the expression of transcription factors NAC and WRKY1. It might regulate the expression of downstream genes through MAPKs pathways and TFs to improve the Pb tolerance of naked oat seedlings. These results proved that MT could significantly promote the growth and development of naked oats seedlings under Pb stress, which is expected to be applied in agricultural production practice.
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Affiliation(s)
- Kai Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Shaanxi Provincial Key Laboratory of Biotechnology, College of Life Sciences, Northwest University, Xian, China
| | - Jinjin He
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Shaanxi Provincial Key Laboratory of Biotechnology, College of Life Sciences, Northwest University, Xian, China
| | - Ningbo Zhao
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Shaanxi Provincial Key Laboratory of Biotechnology, College of Life Sciences, Northwest University, Xian, China
| | - Yajing Zhao
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Shaanxi Provincial Key Laboratory of Biotechnology, College of Life Sciences, Northwest University, Xian, China
| | - Fangbing Qi
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Shaanxi Provincial Key Laboratory of Biotechnology, College of Life Sciences, Northwest University, Xian, China
| | - Fenggui Fan
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Shaanxi Provincial Key Laboratory of Biotechnology, College of Life Sciences, Northwest University, Xian, China
| | - Yingjuan Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Shaanxi Provincial Key Laboratory of Biotechnology, College of Life Sciences, Northwest University, Xian, China
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Singh P, Arif Y, Miszczuk E, Bajguz A, Hayat S. Specific Roles of Lipoxygenases in Development and Responses to Stress in Plants. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11070979. [PMID: 35406959 PMCID: PMC9002551 DOI: 10.3390/plants11070979] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 03/31/2022] [Accepted: 04/01/2022] [Indexed: 05/24/2023]
Abstract
Lipoxygenases (LOXs), naturally occurring enzymes, are widely distributed in plants and animals. LOXs can be non-sulfur iron, non-heme iron, or manganese-containing dioxygenase redox enzymes. LOXs catalyze the oxidation of polyunsaturated fatty acids into fatty acid hydroperoxides. Linolenic acid, a precursor in the jasmonic acid (JA) biosynthesis, is converted to 12-oxo-phytodienoic acid through oxygenation with LOX, allene oxide synthase, and allene oxide cyclase. Moreover, JA participates in seed germination, fruit ripening, senescence, and many other physio-biochemical processes. LOXs also play crucial roles in defense responses against biotic stress, i.e., insects, pests, pathogenic attacks, and abiotic stress, such as wounding, UV-rays, extreme temperature, oxidative stress, and drought.
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Affiliation(s)
- Priyanka Singh
- Department of Botany, Plant Physiology Section, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India; (P.S.); (Y.A.); (S.H.)
| | - Yamshi Arif
- Department of Botany, Plant Physiology Section, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India; (P.S.); (Y.A.); (S.H.)
| | - Edyta Miszczuk
- Department of Biology and Plant Ecology, Faculty of Biology, University of Bialystok, Ciolkowskiego 1J, 15-245 Bialystok, Poland;
| | - Andrzej Bajguz
- Department of Biology and Plant Ecology, Faculty of Biology, University of Bialystok, Ciolkowskiego 1J, 15-245 Bialystok, Poland;
| | - Shamsul Hayat
- Department of Botany, Plant Physiology Section, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India; (P.S.); (Y.A.); (S.H.)
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Lung SC, Lai SH, Wang H, Zhang X, Liu A, Guo ZH, Lam HM, Chye ML. Oxylipin signaling in salt-stressed soybean is modulated by ligand-dependent interaction of Class II acyl-CoA-binding proteins with lipoxygenase. THE PLANT CELL 2022; 34:1117-1143. [PMID: 34919703 PMCID: PMC8894927 DOI: 10.1093/plcell/koab306] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 12/11/2021] [Indexed: 05/24/2023]
Abstract
Plant lipoxygenases (LOXs) oxygenate linoleic and linolenic acids, creating hydroperoxy derivatives, and from these, jasmonates and other oxylipins are derived. Despite the importance of oxylipin signaling, its activation mechanism remains largely unknown. Here, we show that soybean ACYL-COA-BINDING PROTEIN3 (ACBP3) and ACBP4, two Class II acyl-CoA-binding proteins, suppressed activity of the vegetative LOX homolog VLXB by sequestering it at the endoplasmic reticulum. The ACBP4-VLXB interaction was facilitated by linoleoyl-CoA and linolenoyl-CoA, which competed with phosphatidic acid (PA) for ACBP4 binding. In salt-stressed roots, alternative splicing produced ACBP variants incapable of VLXB interaction. Overexpression of the variants enhanced LOX activity and salt tolerance in Arabidopsis and soybean hairy roots, whereas overexpressors of the native forms exhibited reciprocal phenotypes. Consistently, the differential alternative splicing pattern in two soybean genotypes coincided with their difference in salt-induced lipid peroxidation. Salt-treated soybean roots were enriched in C32:0-PA species that showed high affinity to Class II ACBPs. We conclude that PA signaling and alternative splicing suppress ligand-dependent interaction of Class II ACBPs with VLXB, thereby triggering lipid peroxidation during salt stress. Hence, our findings unveil a dual mechanism that initiates the onset of oxylipin signaling in the salinity response.
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Affiliation(s)
- Shiu-Cheung Lung
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Sze Han Lai
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Haiyang Wang
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Xiuying Zhang
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Ailin Liu
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Ze-Hua Guo
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Hon-Ming Lam
- School of Life Sciences and Centre for Soybean Research of the State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Mee-Len Chye
- School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong, China
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Ling L, An Y, Wang D, Tang L, Du B, Shu Y, Bai Y, Guo C. Proteomic analysis reveals responsive mechanisms for saline-alkali stress in alfalfa. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2022; 170:146-159. [PMID: 34891071 DOI: 10.1016/j.plaphy.2021.12.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 11/18/2021] [Accepted: 12/02/2021] [Indexed: 06/13/2023]
Abstract
Saline-alkali stress is a major abiotic stress that limits plant growth, yield, and geographical distribution. Alfalfa is a perennial legume with the largest planting area in the world because of its high protein content, good palatability, and long utilization life. However, saline-alkali stress seriously affects alfalfa yield and quality. To better understand the saline-alkali stress response mechanisms of alfalfa, an isobaric tags proteomics method was used to compare and analyse alfalfa under saline-alkali stress for 0, 1, and 7 days, and 126 (1 vs. 0 days) and 1869 (7 vs. 0 days) differentially abundant proteins (DAPs) were found. Through integrative analysis with differentially expressed genes (DEGs), we found correlated DEGs-DAPs of RNA and protein with similar expression trends at the mRNA and protein levels; these were mainly involved in ABA and Ca2+ signal pathways, regulation of photosynthesis, ROS scavenging, secondary metabolism, and transcription factors (TFs) related to saline-alkali stress. Some genes not exhibiting such trends may have been regulated post-transcriptionally. Furthermore, through transgenic experiments, MsFTL was found to significantly improve the saline-alkali tolerance of plants. Overall, our findings provide important clues for understanding the molecular mechanisms underlying the response of alfalfa to saline-alkali stress.
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Affiliation(s)
- Lei Ling
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province, College of Life Science and Technology, Harbin Normal University, No. 1 of Shida Road, Limin Development, China
| | - Yimin An
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province, College of Life Science and Technology, Harbin Normal University, No. 1 of Shida Road, Limin Development, China
| | - Dan Wang
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province, College of Life Science and Technology, Harbin Normal University, No. 1 of Shida Road, Limin Development, China
| | - Lu Tang
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province, College of Life Science and Technology, Harbin Normal University, No. 1 of Shida Road, Limin Development, China
| | - Binghao Du
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province, College of Life Science and Technology, Harbin Normal University, No. 1 of Shida Road, Limin Development, China
| | - Yongjun Shu
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province, College of Life Science and Technology, Harbin Normal University, No. 1 of Shida Road, Limin Development, China
| | - Yan Bai
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province, College of Life Science and Technology, Harbin Normal University, No. 1 of Shida Road, Limin Development, China
| | - Changhong Guo
- Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province, College of Life Science and Technology, Harbin Normal University, No. 1 of Shida Road, Limin Development, China.
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Shaban M, Ahmed MM, Sun H, Ullah A, Zhu L. Genome-wide identification of lipoxygenase gene family in cotton and functional characterization in response to abiotic stresses. BMC Genomics 2018; 19:599. [PMID: 30092779 PMCID: PMC6085620 DOI: 10.1186/s12864-018-4985-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Accepted: 07/31/2018] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Plant lipoxygenase (LOX) genes are members of the non-haeme iron-containing dioxygenase family that catalyze the oxidation of polyunsaturated fatty acids into functionally diverse oxylipins. The LOX family genes have been extensively studied under biotic and abiotic stresses, both in model and non-model plant species; however, information on their roles in cotton is still limited. RESULTS A total of 64 putative LOX genes were identified in four cotton species (Gossypium (G. hirsutum, G. barbadense, G. arboreum, and G. raimondii)). In the phylogenetic tree, these genes were clustered into three categories (9-LOX, 13-LOX type I, and 13-LOX type II). Segmental duplication of putative LOX genes was observed between homologues from A2 to At and D5 to Dt hinting at allopolyploidy in cultivated tetraploid species (G. hirsutum and G. barbadense). The structure and motif composition of GhLOX genes appears to be relatively conserved among the subfamilies. Moreover, many cis-acting elements related to growth, stresses, and phytohormone signaling were found in the promoter regions of GhLOX genes. Gene expression analysis revealed that all GhLOX genes were induced in at least two tissues and the majority of GhLOX genes were up-regulated in response to heat and salinity stress. Specific expressions of some genes in response to exogenous phytohormones suggest their potential roles in regulating growth and stress responses. In addition, functional characterization of two candidate genes (GhLOX12 and GhLOX13) using virus induced gene silencing (VIGS) approach revealed their increased sensitivity to salinity stress in target gene-silenced cotton. Compared with controls, target gene-silenced plants showed significantly higher chlorophyll degradation, higher H2O2, malondialdehyde (MDA) and proline accumulation but significantly reduced superoxide dismutase (SOD) activity, suggesting their reduced ability to effectively degrade accumulated reactive oxygen species (ROS). CONCLUSION This genome-wide study provides a systematic analysis of the cotton LOX gene family using bioinformatics tools. Differential expression patterns of cotton LOX genes in different tissues and under various abiotic stress conditions provide insights towards understanding the potential functions of candidate genes. Beyond the findings reported here, our study provides a basis for further uncovering the biological roles of LOX genes in cotton development and adaptation to stress conditions.
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Affiliation(s)
- Muhammad Shaban
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China
| | - Muhammad Mahmood Ahmed
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China
| | - Heng Sun
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China
| | - Abid Ullah
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China
| | - Longfu Zhu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, People's Republic of China.
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Hou Y, Meng K, Han Y, Ban Q, Wang B, Suo J, Lv J, Rao J. The Persimmon 9-lipoxygenase Gene DkLOX3 Plays Positive Roles in Both Promoting Senescence and Enhancing Tolerance to Abiotic Stress. FRONTIERS IN PLANT SCIENCE 2015; 6:1073. [PMID: 26697033 PMCID: PMC4674570 DOI: 10.3389/fpls.2015.01073] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 11/16/2015] [Indexed: 05/21/2023]
Abstract
The lipoxygenase (LOX) pathway is a key regulator for lipid peroxidation, which is crucial for plant senescence and defense pathways. In this study, the transcriptional expression patterns of three persimmon (Diospyros kaki L. 'Fupingjianshi') 9-lipoxygenase genes (DkLOX1, DkLOX3, and DkLOX4) were investigated. DkLOX1 was specifically expressed in fruit, particularly in young fruit, and showed little response to the postharvest environments. DkLOX4 was expressed in all tissues and slightly stimulated by mechanical damage and low temperature. DkLOX3 was expressed mainly in mature fruit, and the expression was extremely high throughout the storage period, apparently up-regulated by mechanical damage and high carbon dioxide treatments. Further functional analysis showed that overexpression of DkLOX3 in tomato (Solanum lycopersicum cv. Micro-Tom) accelerated fruit ripening and softening. This was accompanied by higher malondialdehyde (MDA) content and lycopene accumulation, advanced ethylene release peak and elevated expression of ethylene synthesis genes, including ACS2, ACO1, and ACO3. In addition, DkLOX3 overexpression promoted dark induced transgenic Arabidopsis leaf senescence with more chlorophyll loss, increased electrolyte leakage and MDA content. Furthermore, the functions of DkLOX3 in response to abiotic stresses, including osmotic stress, high salinity and drought were investigated. Arabidopsis DkLOX3 overexpression (DkLOX3-OX) transgenic lines were found to be more tolerant to osmotic stress with higher germination rate and root growth than wild-type. Moreover, DkLOX3-OX Arabidopsis plants also exhibited enhanced resistance to high salinity and drought, with similar decreased O2 (-) and H2O2 accumulation and upregulation of stress-responsive genes expression, including RD22, RD29A, RD29B, and NCED3, except for FRY1, which plays a negative role in stress response. Overall, these results suggested that DkLOX3 plays positive roles both in promoting ripening and senescence through lipid peroxidation and accelerated ethylene production and in stress response via regulating reactive oxygen species accumulation and stress responsive genes expression.
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Affiliation(s)
- Yali Hou
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
| | - Kun Meng
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
| | - Ye Han
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
| | - Qiuyan Ban
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
| | - Biao Wang
- College of Horticulture, Shenyang Agricultural UniversityShenyang, China
| | - Jiangtao Suo
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
| | - Jingyi Lv
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
| | - Jingping Rao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityYangling, China
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Liu CW, Chang TS, Hsu YK, Wang AZ, Yen HC, Wu YP, Wang CS, Lai CC. Comparative proteomic analysis of early salt stress responsive proteins in roots and leaves of rice. Proteomics 2014; 14:1759-75. [PMID: 24841874 DOI: 10.1002/pmic.201300276] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Revised: 04/01/2014] [Accepted: 05/15/2014] [Indexed: 11/11/2022]
Abstract
Growth and productivity of rice (Oryza sativa L.) are severely affected by salinity. Understanding the mechanisms that protect rice and other important cereal crops from salt stress will help in the development of salt-stress-tolerant strains. In this study, rice seedlings of the same genetic species with various salt tolerances were studied. We first used 2DE to resolve the expressed proteome in rice roots and leaves and then used nanospray liquid chromatography/tandem mass spectrometry to identify the differentially expressed proteins in rice seedlings after salt treatment. The 2DE assays revealed that there were 104 differentially expressed protein spots in rice roots and 59 in leaves. Then, we identified 83 proteins in rice roots and 61 proteins in rice leaves by MS analysis. Functional classification analysis revealed that the differentially expressed proteins from roots could be classified into 18 functional categories while those from leaves could be classified into 11 functional categories. The proteins from rice seedlings that most significantly contributed to a protective effect against increased salinity were cysteine synthase, adenosine triphosphate synthase, quercetin 3-O-methyltransferase 1, and lipoxygenase 2. Further analysis demonstrated that the primary mechanisms underlying the ability of rice seedlings to tolerate salt stress were glycolysis, purine metabolism, and photosynthesis. Thus, we suggest that differentially expressed proteins may serve as marker group for the salt tolerance of rice.
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Affiliation(s)
- Chih-Wei Liu
- Institute of Molecular Biology, National Chung Hsing University, Taichung, Taiwan
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Ghanem ME, Ghars MA, Frettinger P, Pérez-Alfocea F, Lutts S, Wathelet JP, du Jardin P, Fauconnier ML. Organ-dependent oxylipin signature in leaves and roots of salinized tomato plants (Solanum lycopersicum). JOURNAL OF PLANT PHYSIOLOGY 2012; 169:1090-101. [PMID: 22664263 DOI: 10.1016/j.jplph.2012.03.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2011] [Revised: 03/18/2012] [Accepted: 03/21/2012] [Indexed: 05/04/2023]
Abstract
Oxylipins have been extensively studied in plant defense mechanisms or as signal molecules. Depending on the stress origin (e.g. wounding, insect, pathogen), and also on the plant species or organ, a specific oxylipin signature can be generated. Salt stress is frequently associated with secondary stress such as oxidative damage. Little is known about the damage caused to lipids under salt stress conditions, especially with respect to oxylipins. In order to determine if an organ-specific oxylipin signature could be observed during salt stress, tomato (Solanum lycopersicum cv. Money Maker) plants were submitted to salt stress (100 mM of NaCl) for a 30-d period. A complete oxylipin profiling and LOX related-gene expression measurement were achieved in leaves and roots. As expected, salt stress provoked premature senescence in leaves, as revealed by a decrease in photosystem II efficiency (F(v)/F(m) ratio) and sodium accumulation in leaves. In roots, a significant decrease in several oxylipins (9- and 13-hydro(pero)xy linole(n)ic acids, keto and divinyl ether derivatives) was initiated at day 5 and intensified at day 21 after salt treatment, whereas jasmonic acid content increased. In leaves, the main changes in oxylipins were observed later (at day 30), with an increase in some 9- and 13-hydro(pero)xy linole(n)ic acids and a decrease in some keto-derivatives and in jasmonic acid. Oxylipin enantiomeric characterization revealed that almost all compounds were formed enzymatically, and therefore a massive auto-oxidation of lipids that can be encountered in abscission processes can be excluded here.
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Affiliation(s)
- Michel Edmond Ghanem
- Groupe de Recherche en Physiologie Végétale-GRPV, Earth and Life Institute-Agronomy-ELI-A, Université Catholique de Louvain, 5 Bte 13 Place Croix du Sud, B-1348 Louvain-La-Neuve, Belgium
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Yang XY, Jiang WJ, Yu HJ. The expression profiling of the lipoxygenase (LOX) family genes during fruit development, abiotic stress and hormonal treatments in cucumber (Cucumis sativus L.). Int J Mol Sci 2012; 13:2481-2500. [PMID: 22408466 PMCID: PMC3292035 DOI: 10.3390/ijms13022481] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 02/08/2012] [Accepted: 02/15/2012] [Indexed: 11/16/2022] Open
Abstract
Lipoxygenases (LOXs) are non-haem iron-containing dioxygenases that catalyse oxygenation of polyunsaturated fatty acids and lipids to initiate the formation of a group of biologically active compounds called oxylipins. Plant oxylipins play important and diverse functions in the cells. In the current study, expression analysis during cucumber development using semi-quantitative RT-PCR revealed that 13 of 23 CsLOX genes were detectable, and were tissue specific or preferential accumulation. In total, 12 genes were found to be differentially expressed during fruit development and have different patterns of expression in exocarp, endocarp and pulp at day 5 after anthesis. The expression analysis of these 12 cucumber LOX genes in response to abiotic stresses and plant growth regulator treatments revealed their differential transcript in response to more than one treatment, indicating their diverse functions in abiotic stress and hormone responses. Results suggest that in cucumber the expanded LOX genes may play more diverse roles in life cycle and comprehensive data generated will be helpful in conducting functional genomic studies to understand their precise roles in cucumber fruit development and stress responses.
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Affiliation(s)
- Xue-Yong Yang
- Author to whom correspondence should be addressed; E-Mail: (X.-Y.Y.); (W.-J.J.); Tel.: +86-10-82108797
| | - Wei-Jie Jiang
- Author to whom correspondence should be addressed; E-Mail: (X.-Y.Y.); (W.-J.J.); Tel.: +86-10-82108797
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Youn B, Sellhorn GE, Mirchel RJ, Gaffney BJ, Grimes HD, Kang C. Crystal structures of vegetative soybean lipoxygenase VLX-B and VLX-D, and comparisons with seed isoforms LOX-1 and LOX-3. Proteins 2006; 65:1008-20. [PMID: 17022084 PMCID: PMC2777516 DOI: 10.1002/prot.21182] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The lipoxygenase family of lipid-peroxidizing, nonheme iron dioxygenases form products that are precursors for diverse physiological processes in both plants and animals. In soybean (Glycine max), five vegetative isoforms, VLX-A, VLX-B, VLX-C, VLX-D, VLX-E, and four seed isoforms LOX-1, LOX-2, LOX-3a, LOX-3b have been identified. In this study, we determined the crystal structures of the substrate-free forms of two major vegetative isoforms, with distinct enzymatic characteristics, VLX-B and VLX-D. Their structures are similar to the two seed isoforms, LOX-1 and LOX-3, having two domains with similar secondary structural elements: a beta-barrel N-terminal domain containing highly flexible loops and an alpha-helix-rich C-terminal catalytic domain. Detailed comparison of the structures of these two vegetative isoforms with the structures of LOX-1 and LOX-3 reveals important differences that help explain distinct aspects of the activity and positional specificity of these enzymes. In particular, the shape of the three branches of the internal subcavity, corresponding to substrate-binding and O(2) access, differs among the isoforms in a manner that reflects the differences in positional specificities.
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Affiliation(s)
- Buhyun Youn
- School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-4660
| | - George E. Sellhorn
- Graduate program in Molecular Plant Sciences, Washington State University, Pullman, Washington 99164-6340
| | - Ryan J. Mirchel
- School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-4660
| | - Betty J. Gaffney
- Biological Sciences Department, BIO Unit I, Florida State University, Tallahassee, Florida 32306-4370
| | - Howard D. Grimes
- School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-4660
- Graduate program in Molecular Plant Sciences, Washington State University, Pullman, Washington 99164-6340
| | - ChulHee Kang
- School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-4660
- Graduate program in Molecular Plant Sciences, Washington State University, Pullman, Washington 99164-6340
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Arbona V, Flors V, Jacas J, García-Agustín P, Gómez-Cadenas A. Enzymatic and non-enzymatic antioxidant responses of Carrizo citrange, a salt-sensitive citrus rootstock, to different levels of salinity. PLANT & CELL PHYSIOLOGY 2003; 44:388-94. [PMID: 12721379 DOI: 10.1093/pcp/pcg059] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
In several plant species, oxidative stress has been shown to be one of the causes of damage produced by salinity. In order to assess the implication of oxidative stress in the reported sensitivity of the citrus rootstock Carrizo citrange to salt stress, 5-month-old seedlings were grown with increasing NaCl concentrations added to the watering solution. As an indicator of oxidative damage, malondialdehyde content was measured. The antioxidant capability of the plants was determined by measuring superoxide dismutase, ascorbate peroxidase, catalase and glutathione reductase activities together with the non-enzymatic antioxidant activity. As additional physiological responses to the stress, 1-aminocyclopropane-1-carboxilic acid and proline accumulation were assessed. Data indicate that Carrizo citrange responded to salt-induced oxidative stress by increasing enzymatic and non-enzymatic antioxidant defenses proportionally to the extent of the stress imposed, and that in all plants the malondialdehyde content remained at a moderate level. We suggest that the important deleterious effects reported in Carrizo citrange grown under high NaCl concentrations are mainly due to a cellular intoxication by Cl(-) ions and not to the salt-induced oxidative stress.
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Affiliation(s)
- Vicent Arbona
- Departament de Ciències Experimentals, Universitat Jaume I. Campus de Riu Sec, E-12071 Castelló de la Plana, Spain
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