The rice CONSTANS-like protein OsCOL15 suppresses flowering by promoting Ghd7 and repressing RID1

文献类型： 外文期刊

第一作者： Cheng, Shihua

作者： Cheng, Shihua;Cao, Liyong

作者机构：

关键词： Rice;CONSTANS-like protein;OsCOL15;Photoperiodic flowering

期刊名称：BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS （ 影响因子：3.575； 五年影响因子：3.381 ）

ISSN： 0006-291X

年卷期： 2018 年 495 卷 1 期

页码：

收录情况： SCI

摘要： The photoperiodic flowering pathway is one of the most important regulatory networks controlling flowering time in rice (Oryza sativa L). Rice is a facultative short-day (SD) plant; flowering is promoted under inductive SD conditions and delayed under non-inductive long-day (LD) conditions. In rice, flowering inhibitor genes play an important role in maintaining the trade-off between reproduction and yield. In this study, we identified a novel floral inhibitor, OsCOL15, which encodes a CONSTANS-like transcription factor. Consistent with a function in transcriptional regulation, OsCOL15 localized to the nucleus. Moreover, OsCOL15 had transcriptional activation activity, and the central region of the protein between the B-box and CCT domains was required for this activity. We determined that OsCOL15 is most highly expressed in young organs and exhibits a diurnal expression pattern typical of other floral regulators. Overexpression of OsCOL15 resulted in a delayed flowering phenotype under both SD and LD conditions. Real-time quantitative RT-PCR analysis of flowering regulator gene expression suggested that OsCOL15 suppresses flowering by up-regulating the flowering repressor Grain number, plant height and heading date 7 (Ghd7) and down-regulating the flowering activator Rice Indeterminate 1 (RID1), thus leading to the down-regulation of the flowering activators Early heading date 1, Heading date 3a, and RICE FLOWERING LOCUS T1. These results demonstrate that OsCOL15 is an important floral regulator acting upstream of Ghd7 and RID1 in the rice photoperiodic flowering-time regulatory network. (C) 2017 Elsevier Inc. All rights reserved.

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