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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： 0168-9452

年卷期： 2016 年 247 卷

页码：

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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