期刊
PLANT AND CELL PHYSIOLOGY
卷 53, 期 4, 页码 717-728出版社
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcs029
关键词
EARLY FLOWERING 3; Late-flowering mutant; Photoperiodic flowering; Rice (Oryza sativa L; )
资金
- Ministry of Agriculture, Forestry and Fisheries of Japan [QT2004, QTL4001]
- Grants-in-Aid for Scientific Research [21780002, 22380030] Funding Source: KAKEN
Much progress has been made in our understanding of photoperiodic flowering of rice and the mechanisms underlying short-day (SD) promotion and long-day (LD) repression of floral induction. In this study, we identified and characterized the Ef7 gene, one of the rice orthologs of Arabidopsis EARLY FLOWERING 3 (ELF3). The ef7 mutant HS276, which was induced by gamma-irradiation of the japonica rice cultivar 'Gimbozu', flowers late under both SD and LD conditions. Expression analyses of flowering time-related genes demonstrated that Ef7 negatively regulates the expression of Ghd7, which is a repressor of the photoperiodic control of rice flowering, and consequently up-regulates the expression of the downstream Ehd1 and FT-like genes under both SD and LD conditions. Genetic analyses with a non-functional Ghd7 allele provided further evidence that the delayed flowering of ef7 is mediated through the Ghd7 pathway. The analysis of light-induced expression of Ghd7 revealed that the ef7 mutant was more sensitive to red light than the wild-type plant, but the gate of Ghd7 expression was unchanged. Thus, our results show that Ef7 functions as a floral promoter by repressing Ghd7 expression under both SD and LD conditions.
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