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PNAS:Positive regulatory role of strigolactone in plant responses to drought and salt stress  

2014-01-15 10:27:32|  分类: 抗性基因 |  标签: |举报 |字号 订阅

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Significance

Environmental stresses, such as drought and high salinity, adversely affect plant growth and productivity. Although various phytohormones are known to be involved in regulation of plant stress responses, the role of strigolactone (SL) in this important process remains elusive. By using different molecular and physiological approaches, we provide compelling evidence that, in Arabidopsis, SL acts as positive regulator of plant responses to drought and salt stress, which was associated with shoot- rather than root-related traits. Comparative transcriptome analysis suggests that plants integrate multiple hormone-response pathways—at least SL, abscisic acid, and cytokinin pathways—for adaptation to environmental stress. Our findings demonstrate that genetic modulation of SL content/response could provide a new approach for development of crops with improved stress tolerance.

Abstract

This report provides direct evidence that strigolactone (SL) positively regulates drought and high salinity responses in Arabidopsis. Both SL-deficient and SL-response [more axillary growth (max)] mutants exhibited hypersensitivity to drought and salt stress, which was associated with shoot- rather than root-related traits. Exogenous SL treatment rescued the drought-sensitive phenotype of the SL-deficient mutants but not of the SL-response mutant, and enhanced drought tolerance of WT plants, confirming the role of SL as a positive regulator in stress response. In agreement with the drought-sensitive phenotype, max mutants exhibited increased leaf stomatal density relative to WT and slower abscisic acid (ABA)-induced stomatal closure. Compared with WT, the max mutants exhibited increased leaf water loss rate during dehydration and decreased ABA responsiveness during germination and postgermination. Collectively, these results indicate that cross-talk between SL and ABA plays an important role in integrating stress signals to regulate stomatal development and function. Additionally, a comparative microarray analysis of the leaves of the SL-response max2 mutant and WT plants under normal and dehydrative conditions revealed an SL-mediated network controlling plant responses to stress via many stress- and/or ABA-responsive and cytokinin metabolism-related genes. Our results demonstrate that plants integrate multiple hormone-response pathways for adaptation to environmental stress. Based on our results, genetic modulation of SL content/response could be applied as a potential approach to reduce the negative impact of abiotic stress on crop productivity.

PNAS:Positive regulatory role of strigolactone in plant responses to drought and salt stress - 喜欢吃桃子 - wangyufeng的博客
 Hypersensitivity of SL-deficient and SL-signaling max mutant plants to drought stress. (A) Three-wk-old WT and SL-deficient max3-11 and max4-7 and SL-signaling max2-3 mutant plants before being subjected to a drought stress. (B) WT and mutant plants subjected to a drought stress and then rewatered for 3 d. Inflorescences were removed from the surviving plants before photographing. (C) Unstressed (control) WT and max plants grown in parallel with the drought test. (D) Percent survival rates of WT and mutant plants. Data represent the mean and SE from data pooled from three independent experiments (n = 30 per genotype per experiment). Asterisks indicate significant differences as determined by a Student t test (***P < 0.001).
Full text:http://www.pnas.org/content/111/2/851.abstract
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