Table_1_Candidate Genes Modulating Reproductive Timing in Elite US Soybean Lines Identified in Soybean Alleles of Arabidopsis Flowering Orthologs With Divergent Latitude Distribution.XLSX

Adaptation of soybean cultivars to the photoperiod in which they are grown is critical for optimizing plant yield. However, despite its importance, only the major loci conferring variation in flowering time and maturity of US soybean have been isolated. By contrast, over 200 genes contributing to floral induction in the model organism Arabidopsis thaliana have been described. In this work, putative alleles of a library of soybean orthologs of these Arabidopsis flowering genes were tested for their latitudinal distribution among elite US soybean lines developed in the United States. Furthermore, variants comprising the alleles of genes with significant differences in latitudinal distribution were assessed for amino acid conservation across disparate genera to infer their impact on gene function. From these efforts, several candidate genes from various biological pathways were identified that are likely being exploited toward adaptation of US soybean to various maturity groups.

大豆品种对种植环境光周期的适应性，对于优化作物产量至关重要。然而，尽管该性状意义重大，目前仅分离出了影响美国大豆开花时间与成熟期变异的主要位点。相比之下，模式植物拟南芥（Arabidopsis thaliana）中已有超过200个参与开花诱导的基因被报道。本研究针对上述拟南芥开花基因的大豆直系同源基因文库的推定等位基因，检测了其在美国选育的优良大豆品系中的纬度分布特征。此外，本研究还针对纬度分布存在显著差异的基因的等位基因变异，跨不同属开展了氨基酸保守性分析，以推断其对基因功能的影响。通过上述研究工作，本研究从多条生物学通路中鉴定出多个候选基因，这些基因或可被用于调控美国大豆对不同生育期组的适应性。