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Overexpression of OsNF-YB4 leads to flowering early, improving photosynthesis and better grain yield in hybrid rice

文献类型： 外文期刊

作者： Peng, Meifang 1 ; Gan, Feng 1 ; Lin, Xiaomin 1 ; Yang, Run 1 ; Li, Shaoyi 1 ; Li, Wei 1 ; Wu, Lan 1 ; Fan, Xiaoli 1 ; Chen, Kegui 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Inst Biotechnol & Nucl Technol, 106 Shizishan Rd, Chengdu 610061, Sichuan, Peoples R China

关键词： Oryza sativa L; OsNF-YB4; Flowering time; Stem growth; Photosynthesis; Grain yield; Hybrid rice

期刊名称：PLANT SCIENCE （ 影响因子：5.2； 五年影响因子：5.7 ）

ISSN： 0168-9452

年卷期： 2023 年 331 卷

页码：

收录情况： SCI

摘要： For cereal crops, such as rice, the grain yield mainly comes from the accumulation of carbohydrates in the seed, which depends ultimately on photosynthesis during the growth period. To create early ripen variety, higher efficiency of photosynthesis is thus necessary to get higher grain yield with shorter growth period. In this study, flowering early was observed in the hybrid rice with overexpression of OsNF-YB4. Along with the flowering early, the hybrid rice also was shorter in plant height with less of leaves and internodes, but no changes of panicle length and leaf emergence. The grain yield was kept or even increased in the hybrid rice with shorter growth period. Transcription analysis revealed that Ghd7-Ehd1-Hd3a/RFT1 was activated early to promote the flowering transition in the overexpression hybrids. RNA-Seq study further showed that carbohydrate-related pathways were significantly altered in addition to circadian pathway. Notably, up-regulation of three pathways related to plant photosynthesis was observed, as well. Increased carbon assimilation with alteration of chlorophyll contents was subsequently detected in the following physiological experiments. All these results demonstrate that overexpression of OsNF-YB4 in the hybrid rice activates flowering early and improves photosynthesis resulting in better grain yield with shorter growth period.

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