OsBBX14 delays heading date by repressing florigen gene expression under long and short-day conditions in rice
文献类型: 外文期刊
作者: Bai, Bo 1 ; Zhao, Jie 1 ; Li, Yaping 1 ; Zhang, Fang 3 ; Zhou, Jinjun 1 ; Chen, Fan 3 ; Xie, Xianzhi 1 ;
作者机构: 1.Shandong Acad Agr Sci, Shandong Rice Res Inst, Jinan 250100, Peoples R China
2.Shandong Normal Univ, Coll Life Sci, Jinan 250014, Peoples R China
3.Chinese Acad Sci, Inst Genet & Dev Biol, Beijing 100190, Peoples R China
关键词: Rice;B-box zinc finger protein;Heading date;Photoperiod pathway;Circadian clock
期刊名称:PLANT SCIENCE ( 影响因子:4.729; 五年影响因子:5.132 )
ISSN:
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收录情况: SCI
摘要: B-box (BBX) proteins are zinc finger proteins containing B-box domains, which have roles in Arabidopsis growth and development. However, little is known concerning rice BBXs. Herein, we identified a rice BBX protein, Oryza sativa BBX14 (OsBBX14). OsBBX14 is highly expressed in flag leaf blades. OsBBX14 expression shows a diurnal rhythm under photoperiodic conditions and subsequent continuous white light. OsBBX14 is located in the nucleus and has transcriptional activation potential. OsBBX14-overexpression (OsBBX14-OX) lines exhibited delayed heading date under long-day (LD) and short-day (SD) conditions, whereas RNAi lines of OsBBX14 lines had similar heading dates to the WT. The florigen genes, Hd3a and RFT1, were downregulated in the OsBBX14-OX lines under LD and SD conditions. Under LD conditions, Hd1 was expressed higher in the OsBBX14-OX lines than in the wild type (WT), and the rhythmic expression of circadian clock genes, OsLHY and OsPRR1, was changed in OsBBX14-OX lines. Thus, OsBBX14 acts as a floral repressor by promoting Hd1 expression under LD conditions, probably because of crosstalk with the circadian clock. Under SD conditions, Ehd1 expression was reduced in OsBBX14-OX lines, but Hd1 and circadian clock gene expressions were unaffected, indicating that OsBBX14 acts as a repressor of Ehd1. Our findings suggested that OsBBX14 regulates heading date differently under LD and SD conditions. (C) 2016 Elsevier Ireland Ltd. All rights reserved.
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