State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China.
Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China.
Int J Mol Sci. 2023 Jun 29;24(13):10834. doi: 10.3390/ijms241310834.
Spikelet number and grain number per spike are two crucial and correlated traits for grain yield in wheat. ) is a key regulator of inflorescence architecture and spikelet formation in wheat. In this study, near-isogenic lines derived from the cross of a synthetic hexaploid wheat and commercial cultivars generated by double top-cross and two-phase selection were evaluated for the number of days to heading and other agronomic traits. The results showed that heading time segregation was conferred by a single incomplete dominant gene , and the 2 kb insertion in the promoter region was responsible for the delay in heading. Meanwhile, slightly delayed heading plants and later heading plants obviously have advantages in grain number and spikelet number of the main spike compared with early heading plants. Utilization of photoperiod sensitivity phenotype as a potential means to increase wheat yield potential.
小穗数和每穗粒数是小麦产量的两个关键和相关性状。TaGW2 是小麦花序结构和小穗形成的关键调控因子。在这项研究中，通过双端交和两相选择从合成六倍体小麦与商业品种杂交衍生的近等基因系，对抽穗期和其他农艺性状进行了评估。结果表明，抽穗期的分离由单个不完全显性基因控制，启动子区域的 2kb 插入负责抽穗期的延迟。同时，与早抽穗植株相比，抽穗稍晚的植株和晚抽穗的植株在主穗的粒数和小穗数上明显具有优势。利用光周期敏感性表型作为提高小麦产量潜力的一种潜在手段。
