National Center for Transgenic Research in Plants, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
Plant Cell Environ. 2020 Apr;43(4):934-944. doi: 10.1111/pce.13695. Epub 2020 Jan 25.
Day length has an important influence on flowering and growth habit in many plant species. In crops such as soybean, photoperiod sensitivity determines the geographical range over which a given cultivar can grow and flower. The soybean genome contains ~10 genes homologous to FT, a central regulator of flowering from Arabidopsis thaliana. However, the precise roles of these soybean FTs are not clearly. Here we show that one such gene, GmFT2b, promotes flowering under long-days (LDs). Overexpression of GmFT2b upregulates expression of flowering-related genes which are important in regulating flowering time. We propose a 'weight' model for soybean flowering under short-day (SD) and LD conditions. Furthermore, we examine GmFT2b sequences in 195 soybean cultivars, as well as flowering phenotypes, geographical distributions and maturity groups. We found that Hap3, a major GmFT2b haplotype, is associated with significantly earlier flowering at higher latitudes. We anticipate our assay to provide important resources for the genetic improvement of soybean, including new germplasm for soybean breeding, and also increase our understanding of functional diversity in the soybean FT gene family.
光照时间对许多植物物种的开花和生长习性有重要影响。在大豆等作物中，光周期敏感性决定了特定品种的生长和开花的地理范围。大豆基因组包含约 10 个与拟南芥 FT 同源的基因，FT 是开花的中央调控因子。然而，这些大豆 FT 的精确作用尚不清楚。在这里，我们表明，其中一个基因 GmFT2b 在长日照（LDs）下促进开花。GmFT2b 的过表达上调了与调控开花时间有关的开花相关基因的表达。我们提出了一个大豆在短日照（SD）和 LD 条件下开花的“权重”模型。此外，我们还研究了 195 个大豆品种中的 GmFT2b 序列、开花表型、地理分布和成熟组。我们发现，Hap3，一个主要的 GmFT2b 单倍型，与高纬度地区更早的开花显著相关。我们预计我们的检测将为大豆的遗传改良提供重要资源，包括大豆育种的新种质资源，同时也增加我们对大豆 FT 基因家族功能多样性的理解。
