期刊
MOLECULAR PLANT
卷 7, 期 5, 页码 841-855出版社
OXFORD UNIV PRESS
DOI: 10.1093/mp/ssu013
关键词
abscisic acid; crosstalk; short-term stress; continuing stress; phytohormone; survival and growth
资金
- National Basic Research Program of China [2012CB114300]
- National Natural Science Foundation of China [30925020, 91117005]
- Shanghai Science and Technology Committee [10JC1400800]
- Program of Shanghai Subject Chief Scientist [11XD1400700]
- Ph.D. Program Foundation of Ministry of Education of China [20080246002]
The stress phytohormone, abscisic acid (ABA), plays important roles in facilitating plants to survive and grow well under a wide range of stress conditions. Previous gene expression studies mainly focused on plant responses to short-term ABA treatment, but the effect of sustained ABA treatment and their difference are poorly studied. Here, we treated plants with ABA for 1 h or 9 d, and our genome-wide analysis indicated the differentially regulated genes under the two conditions were tremendously different. We analyzed other hormones' signaling changes by using their whole sets of known responsive genes as reporters and integrating feedback regulation of their biosynthesis. We found that, under short-term ABA treatment, signaling outputs of growth-promoting hormones, brassinosteroids and gibberellins, and a biotic stress-responsive hormone, jasmonic acid, were significantly inhibited, while auxin and ethylene signaling outputs were promoted. However, sustained ABA treatment repressed cytokinin and gibberellin signaling, but stimulated auxin signaling. Using several sets of hormone-related mutants, we found candidates in corresponding hormonal signaling pathways, including receptors or transcription regulators, are essential in responding to ABA. Our findings indicate interactions of ABA-dependent stress signals with hormones at different levels are involved in plants to survive under transient stress and to adapt to continuing stressful environments.
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