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Salinity and drought are the most important environmental constraints limiting crop growth and productivity. Here, we have characterized a gene 'SaβNAC' encoding the β subunit of nascent polypeptide associated complex from a halophyte Spartina alterniflora and investigated its role toward abiotic stress regulation. Expression of SaβNAC was differentially regulated by abiotic stresses, including salinity, drought, cold, and ABA in leaves and roots of S. alterniflora. Constitutive over-expression of SaβNAC in Arabidopsis exhibited normal growth under non-stress conditions but enhanced tolerance to salt and drought stresses. Transgenic SaβNAC Arabidopsis retained more chlorophyll, proline, and showed improved ionic homeostasis with less damage under stress conditions compared to WT plants. This is a first report to demonstrate the involvement of βNAC in imparting abiotic stress tolerance which might be due to protection of the newly synthesized polypeptides involved in various stress tolerance mechanisms from abiotic stress induced damage and inhibition of cell death in plant. 相似文献
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Salt cress. A halophyte and cryophyte Arabidopsis relative model system and its applicability to molecular genetic analyses of growth and development of extremophiles 总被引:16,自引:0,他引:16 下载免费PDF全文
Inan G Zhang Q Li P Wang Z Cao Z Zhang H Zhang C Quist TM Goodwin SM Zhu J Shi H Damsz B Charbaji T Gong Q Ma S Fredricksen M Galbraith DW Jenks MA Rhodes D Hasegawa PM Bohnert HJ Joly RJ Bressan RA Zhu JK 《Plant physiology》2004,135(3):1718-1737
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Abiotic stresses such as drought, salinity, and low temperature have drastic effects on plant growth and development. However, the molecular mechanisms regulating biochemical and physiological changes in response to stresses are not well understood. Protein kinases are major signal transduction factors among the reported molecular mechanisms mediating acclimation to environmental changes. Protein kinase ABC1 (activity of bc(1) complex) is involved in regulating coenzyme Q biosynthesis in mitochondria in yeast (Saccharomyces cersvisiae), and in balancing oxidative stress in chloroplasts in Arabidopsis thaliana. In the current study, TaABC1 (Triticum aestivum L. activity of bc(1) complex) protein kinase was localized to the cell membrane, cytoplasm, and nucleus. The effects of overexpressing TaABC1 in transgenic Arabidopsis plants on responses to drought, salt, and cold stress were further investigated. Transgenic Arabidopsis overexpressing the TaABC1 protein showed lower water loss and higher osmotic potential, photochemistry efficiency, and chlorophyll content, while cell membrane stability and controlled reactive oxygen species homeostasis were maintained. In addition, overexpression of TaABC1 increased the expression of stress-responsive genes, such as DREB1A, DREB2A, RD29A, ABF3, KIN1, CBF1, LEA, and P5CS, detected by real-time PCR analysis. The results suggest that TaABC1 overexpression enhances drought, salt, and cold stress tolerance in Arabidopsis, and imply that TaABC1 may act as a regulatory factor involved in a multiple stress response pathways. 相似文献
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LEA protein,late-embryogenesis-abundant protein,is importantin response to thesalt and drought stresses in plants.Here,weidentified a cDNA full length of LEA from soybean and found that LEA enhance the ability of anti-salinity in transgenic Arabidopsis thaliana.The expression of GmPM30 increases highly under salinity,cold or ABA treatment,and enhances by certain degree under drought stress.The germination rates,primary root lengths and survival rate of GmPM30 over-expression lines are obviously higher than that of the wild-type after suffering the salinity stress.Our studies displays that GmPM30-ox apparently enhances the tolerance to salinity in Arabidopsis thaliana. 相似文献
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Plant salt tolerance 总被引:156,自引:0,他引:156
Zhu JK 《Trends in plant science》2001,6(2):66-71
Soil salinity is a major abiotic stress in plant agriculture worldwide. This has led to research into salt tolerance with the aim of improving crop plants. However, salt tolerance might have much wider implications because transgenic salt-tolerant plants often also tolerate other stresses including chilling, freezing, heat and drought. Unfortunately, suitable genetic model systems have been hard to find. A recently discovered halophytic plant species, Thellungiella halophila, now promises to help in the detection of new tolerance determinants and operating pathways in a model system that is not limited to Arabidopsis traits or ecotype variations. 相似文献
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The AtGenExpress global stress expression data set: protocols, evaluation and model data analysis of UV-B light, drought and cold stress responses 总被引:17,自引:0,他引:17
Kilian J Whitehead D Horak J Wanke D Weinl S Batistic O D'Angelo C Bornberg-Bauer E Kudla J Harter K 《The Plant journal : for cell and molecular biology》2007,50(2):347-363
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Important roles of drought- and cold-inducible genes for galactinol synthase in stress tolerance in Arabidopsis thaliana 总被引:17,自引:0,他引:17
Taji T Ohsumi C Iuchi S Seki M Kasuga M Kobayashi M Yamaguchi-Shinozaki K Shinozaki K 《The Plant journal : for cell and molecular biology》2002,29(4):417-426
Raffinose family oligosaccharides (RFO) accumulating during seed development are thought to play a role in the desiccation tolerance of seeds. However, the functions of RFO in desiccation tolerance have not been elucidated. Here we examine the functions of RFO in Arabidopsis thaliana plants under drought- and cold-stress conditions, based on the analyses of function and expression of genes involved in RFO biosynthesis. Sugar analysis showed that drought-, high salinity- and cold-treated Arabidopsis plants accumulate a large amount of raffinose and galactinol, but not stachyose. Raffinose and galactinol were not detected in unstressed plants. This suggests that raffinose and galactinol are involved in tolerance to drought, high salinity and cold stresses. Galactinol synthase (GolS) catalyses the first step in the biosynthesis of RFO from UDP-galactose. We identified three stress-responsive GolS genes (AtGolS1, 2 and 3) among seven Arabidopsis GolS genes. AtGolS1 and 2 were induced by drought and high-salinity stresses, but not by cold stress. By contrast, AtGolS3 was induced by cold stress but not by drought or salt stress. All the GST fusion proteins of GST-AtGolS1, 2 and 3 expressed in Escherichia coli had galactinol synthase activities. Overexpression of AtGolS2 in transgenic Arabidopsis caused an increase in endogenous galactinol and raffinose, and showed reduced transpiration from leaves to improve drought tolerance. These results show that stress-inducible galactinol synthase plays a key role in the accumulation of galactinol and raffinose under abiotic stress conditions, and that galactinol and raffinose may function as osmoprotectants in drought-stress tolerance of plants. 相似文献
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Kim JS Jung HJ Lee HJ Kim KA Goh CH Woo Y Oh SH Han YS Kang H 《The Plant journal : for cell and molecular biology》2008,55(3):455-466
Despite the fact that glycine-rich RNA-binding proteins (GRPs) have been implicated in the responses of plants to environmental stresses, their physiological functions and mechanisms of action in stress responses remain largely unknown. Here, we assessed the functional roles of GRP7, one of the eight GRP family members in Arabidopsis thaliana , on seed germination, seedling growth, and stress tolerance under high salinity, drought, or cold stress conditions. The transgenic Arabidopsis plants overexpressing GRP7 under the control of the cauliflower mosaic virus 35S promoter displayed retarded germination and poorer seedling growth compared with the wild-type plants and T-DNA insertional mutant lines under high salinity or dehydration stress conditions. By contrast, GRP7 overexpression conferred freezing tolerance in Arabidopsis plants. GRP7 is expressed abundantly in the guard cells, and has been shown to influence the opening and closing of the stomata, in accordance with the prevailing stress conditions. GRP7 is localized to both the nucleus and the cytoplasm, and is involved in the export of mRNAs from the nucleus to the cytoplasm under cold stress conditions. Collectively, these results provide compelling evidence that GRP7 affects the growth and stress tolerance of Arabidopsis plants under high salt and dehydration stress conditions, and also confers freezing tolerance, particularly via the regulation of stomatal opening and closing in the guard cells. 相似文献
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Cold, salinity and drought stresses: an overview 总被引:57,自引:0,他引:57
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Regulation of drought tolerance by gene manipulation of 9-cis-epoxycarotenoid dioxygenase, a key enzyme in abscisic acid biosynthesis in Arabidopsis 总被引:24,自引:0,他引:24
Iuchi S Kobayashi M Taji T Naramoto M Seki M Kato T Tabata S Kakubari Y Yamaguchi-Shinozaki K Shinozaki K 《The Plant journal : for cell and molecular biology》2001,27(4):325-333
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Jin-Qi Zhu Jian-Tao Zhang Ren-Jie Tang Qun-Dan Lv Qiu-Qing Wang Lei Yang Hong-Xia Zhang 《Physiologia plantarum》2009,136(4):407-425