文献类型： 外文期刊
作者： Xu, Miao Yun 1 ; Zhang, Lan 1 ; Li, Wei Wei 1 ; Hu, Xiao Long 1 ; Wang, Ming-Bo 2 ; Fan, Yun Liu 1 ; Zhang, Chun Yi 1 ; W 1 ;
作者机构： 1.Chinese Acad Agr Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Biotechnol Res Inst, Beijing 100081, Peoples R China
2.CSIRO Plant Ind, Canberra, ACT 2601, Australia
关键词： FLC;flowering;stress;microRNA;miR169;NF-YA family
期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）
ISSN：
年卷期：
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收录情况： SCI
摘要： Plants interact with their environment and they often flower earlier under stress conditions, but how such stress-induced flowering is regulated remains poorly understood. Here evidence is presented that the miR169 family plays a key role in stress-induced flowering in plants. The microRNA (miRNA) miR169 family members are up-regulated in Arabidopsis, maize, and soybean under abiotic stresses. Overexpression of miR169d in Arabidopsis results in early flowering, and overexpression of the miR169d target gene, AtNF-YA2, especially a miR169d-resistant version of AtNF-YA2, results in late flowering. The results suggest that the miR169 family regulates stress-induced flowering by repressing the AtNF-YA transcription factor, which in turn reduces the expression of FLOWERING LOCUS C (FLC), allowing for the expression of FLC target genes such as FLOWERING LOCUS T (FT) and LEAFY (LFY) to promote flowering. It was shown that the expression of genes or miRNAs involved in the other flowering pathways, namely the photoperiod (CO), ambient temperature (SVP), ageing (miR156), and gibberelin (SOC1) pathways, was not affected in miR169d-overexpressing plants, suggesting that stress-induced early flowering is a novel signalling pathway mediated by miR169.
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