期刊
PLANT JOURNAL
卷 84, 期 6, 页码 1114-1123出版社
WILEY
DOI: 10.1111/tpj.13067
关键词
NAC; transcription factor; leaf senescence; abscisic acid; Arabidopsis thaliana
资金
- Program for the Promotion of Basic and Applied Researches for Innovations in Biooriented Industry (BRAIN)
- Ministry of Agriculture, Forestry and Fisheries (MAFF)
- Science and Technology Research Partnership for Sustainable Development (SATREPS) of the Japan Science and Technology Agency (JST)/Japan International Cooperation Agency (JICA)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [25450522, 26430191, 24687007] Funding Source: KAKEN
Leaf senescence is the terminal phenotype of plant leaf development, and ethylene is a major plant hormone inducing leaf senescence. Recent studies have shown that abscisic acid (ABA) also induces leaf senescence. However, the detailed mechanisms of ABA-induced leaf senescence remain unclear. We focused on the A subfamily of stress-responsive NAC (SNAC-A) transcription factors, the expression of which is induced by abiotic stresses, particularly ABA. Gene expression analysis revealed that seven SNAC-A genes including ANAC055, ANAC019, ANAC072/RD26, ANAC002/ATAF1, ANAC081/ATAF2, ANAC102 and ANAC032 were induced by long-term treatment with ABA and/or during age-dependent senescence. The SNAC-A septuple mutant clearly showed retardation of ABA-inducible leaf senescence. Microarray analysis indicated that SNAC-As induce ABA-and senescence-inducible genes. In addition, comparison of the expression profiles of the downstream genes of SNAC-As and ABA-responsive element (ABRE)-binding protein (AREB)/ABREbinding factor (ABF) (AREB/ABFs) indicates that SNAC-As induce a different set of ABA-inducible genes from those mediated by AREB/ABFs. These results suggest that SNAC-As play crucial roles in ABA-induced leaf senescence signaling. We also discuss the function of SNAC-As in the transcriptional change of leaf senescence as well as in ABA response under abiotic stress conditions.
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