OsBBX14 promotes photomorphogenesis in rice by activating OsHY5L1 expression under blue light conditions
文献类型： 外文期刊
作者： Bai, Bo 1 ; Lu, Nannan 1 ; Li, Yaping 1 ; Guo, Shanli 2 ; Yin, Haibo 2 ; He, Yanan 1 ; Sun, Wei 1 ; Li, Wen 1 ; Xie, Xianzhi 1 ;
作者机构： 1.Shandong Acad Agr Sci, Shandong Rice Res Inst, Jinan 250100, Shandong, Peoples R China
2.Yantai Univ, Coll Life Sci, Yantai 264005, Peoples R China
3.Shandong Normal Univ, Coll Life Sci, Jinan 250014, Shandong, Peoples R China
关键词： Rice; OsBBX14; Photomorphogenesis; Blue light; Cell elongation; HY5L1
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： 2019 年 284 卷
页码：
收录情况： SCI
摘要： In rice, OsBBX14, a B-box (BBX) transcription factor, reportedly delays heading. Here, we revealed that OsBBX14 positively regulates rice photomorphogenesis. The OsBBX14-overexpressing (OsBBX14-OX) seedlings were hypersensitive to light, especially blue light, and exhibited dwarfism, while the OsBBX14 knock-out plants (osbbx14) were taller than wild-type plants under blue light. Histological analyses indicated that the observed dwarfism was mainly due to decreased cell length. Additionally, OsBBX14 abundance (mRNA and protein levels) was influenced by different light wavelengths in a time-dependent manner. The expression levels of HY5Ls (LONG HYPOCOTYL 5 LIKE) and ELIPs (EARLY LIGHT-INDUCIBLE PROTEIN) genes, whose Arabidopsis thaliana homologs function as positive regulators in the light signaling pathway, were significantly upregulated in OsBBX14-OX lines. In contrast, the expression of genes related to cell wall organization and dwarfism was downregulated in OsBBX14-OX lines. Chromatin immunoprecipitation (ChIP) assays confirmed that OsBBX14 binds to the T/G-box of HY5L1 (LONG HYPOCOTYL 5 LIKE 1) promoter. LUC complementation imaging (LCI) results suggested that OsBBX14 had physical interaction with OsCRY2 protein. Collectively, in response to blue light, OsBBX14 promotes photomorphogenesis, probably by directly or indirectly regulating the expression of HY5L1 or other genes related to cell wall organization and dwarfism.
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