Qiu Leilei, Zhou Peng, Wang Hao, Zhang Cheng, Du Chengxing, Tian Shujun, Wu Qinqin, Wei Litian, Wang Xiaoying, Zhou Yiming, Huang Rongyu, Huang Xi, Ouyang Xinhao
Rice Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350002, China.
State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China.
Plants (Basel). 2023 Feb 16;12(4):899. doi: 10.3390/plants12040899.
Rice ( L.), one of the most important food crops worldwide, is a facultative short-day (SD) plant in which flowering is modulated by seasonal and temperature cues. The photoperiodic molecular network is the core network for regulating flowering in rice, and is composed of photoreceptors, a circadian clock, a photoperiodic flowering core module, and florigen genes. The Hd1-DTH8-Ghd7-PRR37 module, a photoperiodic flowering core module, improves the latitude adaptation through mediating the multiple daylength-sensing processes in rice. However, how the other photoperiod-related genes regulate daylength-sensing and latitude adaptation remains largely unknown. Here, we determined that mutations in the photoreceptor and circadian clock genes can generate different daylength-sensing processes. Furthermore, we measured the yield-related traits in various mutants, including the main panicle length, grains per panicle, seed-setting rate, hundred-grain weight, and yield per panicle. Our results showed that the , and mutants can change the daylength-sensing processes and exhibit longer main panicle lengths and more grains per panicle. Hence, the , and locus has excellent potential for latitude adaptation and production improvement in rice breeding. In summary, this study systematically explored how vital elements of the photoperiod network regulate daylength sensing and yield traits, providing critical information for their breeding applications.
水稻（Oryza sativa L.）是全球最重要的粮食作物之一，是一种兼性短日植物，其开花受季节和温度信号调节。光周期分子网络是调控水稻开花的核心网络，由光感受器、生物钟、光周期开花核心模块和成花素基因组成。光周期开花核心模块Hd1-DTH8-Ghd7-PRR37通过介导水稻的多个日长感知过程来提高纬度适应性。然而，其他光周期相关基因如何调控日长感知和纬度适应性在很大程度上仍不清楚。在此，我们确定光感受器和生物钟基因的突变可产生不同的日长感知过程。此外，我们测量了各种突变体中与产量相关的性状，包括主穗长度、每穗粒数、结实率、百粒重和每穗产量。我们的结果表明，phyB、cry1和PRR37突变体可改变日长感知过程，并表现出更长的主穗长度和更多的每穗粒数。因此，phyB、cry1和PRR37位点在水稻育种中具有优异的纬度适应性和产量提升潜力。总之，本研究系统地探索了光周期网络的关键元件如何调控日长感知和产量性状，为它们在育种中的应用提供了关键信息。
