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An atypical HLH protein OsLF in rice regulates flowering time and interacts with OsPIL13 and OsPIL15

文献类型： 外文期刊

作者： Zhao, Xiao-Ling 1 ; Shi, Zhen-Ying 1 ; Peng, Ling-Tao 1 ; Shen, Ge-Zhi 2 ; Zhang, Jing-Liu 1 ;

作者机构： 1.Chinese Acad Sci, Shanghai Inst Biol Sci, Natl Key Lab Plant Mol Genet, Inst Plant Physiol & Ecol, Shanghai 200032, Peoples R China

2.Shanghai Acad Agr Sci, Plant Breeding & Cultivat Res Inst, Shanghai 201106, Peoples R China

关键词： protein;rice;time

期刊名称：NEW BIOTECHNOLOGY （ 影响因子：5.079； 五年影响因子：5.423 ）

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收录情况： SCI

摘要： In plants, flowering as a crucial developmental event is highly regulated by both genetic programs and environmental signals. Genetic analysis of flowering time mutants is instrumental in dissecting the regulatory pathways of flowering induction. In this study, we isolated the OsLF gene by its association with the T-DNA insertion in the rice late flowering mutant named A654. The OsLF gene encodes an atypical HLH protein composed of 419 amino acids (aa). Overexpression of the OsLF gene in wild type rice recapitulated the late flowering phenotype of A654, indicating that the OsLF gene negatively regulates flowering. Flowering genes downstream of OsPRR1 such as OsGI and Hd1 were down regulated in the A654 mutant. Yeast two hybrid and colocalization assays revealed that OsLF interacts strongly with OsPIL13 and OsPIL15 that are potentially involved in light signaling. In addition, OsPIL13 and OsPIL15 colocalize with OsPRR1, an ortholog of the Arabidopsis APRR1 gene that controls photoperiodic flowering response through clock function. Together, these results suggest that overexpression of OsLF might repress expression of OsGI and Hdl by competing with OsPRR1 in interacting with OsPIL13 and OsPIL15 and thus induce late flowering.

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