Mo Youngjun, Lee Chang-Min, Park Hyang-Mi, Ha Su-Kyung, Kim Mi-Jung, Kwak Jieun, Lee Hyun-Sook, Lee Jeong-Heui, Jeung Ji-Ung
National Institute of Crop Science, Rural Development Administration, Wanju 55365, Korea.
Department of Crop Science and Biotechnology, Jeonbuk National University, Jeonju 54896, Korea.
Plants (Basel). 2021 Nov 8;10(11):2408. doi: 10.3390/plants10112408.
Optimizing flowering time in crop plants is critical for maximizing yield and quality under target environments. While there is a wide range of heading date variation in Korean rice cultivars, the underlying gene mechanisms are unclear. Here, we sequenced the protein coding regions of , the major rice heading date gene, from 293 Korean rice cultivars and investigated the associations between allele types and major agronomic traits under four different environments. There were four functional and five nonfunctional alleles distributed among the 293 Korean rice cultivars. The effects of the allele types were highly significant for days to heading in all four environments, explaining 51.4-65.8% of the phenotypic variation. On average, cultivars carrying nonfunctional headed 13.7 days earlier than those carrying functional . While the allele types exhibited highly significant effects on culm length and protein content under all four environments, the differences between cultivars carrying and were minimal. The effects of the allele types on amylose content were significant in only one of the four environments. Our results provide useful information for fine-tuning rice heading dates by utilizing different alleles in rice breeding programs.
优化作物的开花时间对于在目标环境下实现产量和品质最大化至关重要。虽然韩国水稻品种的抽穗期存在广泛变异，但其潜在的基因机制尚不清楚。在此，我们对293个韩国水稻品种的主要水稻抽穗期基因的蛋白质编码区进行了测序，并研究了四种不同环境下该基因等位基因类型与主要农艺性状之间的关联。在293个韩国水稻品种中分布着4个功能型和5个非功能型等位基因。该基因等位基因类型对所有四种环境下的抽穗天数影响极显著，解释了表型变异的51.4% - 65.8%。平均而言，携带非功能型等位基因的品种比携带功能型等位基因的品种抽穗早13.7天。虽然该基因等位基因类型在所有四种环境下对茎长和蛋白质含量均表现出极显著影响，但携带不同等位基因的品种之间差异极小。该基因等位基因类型对直链淀粉含量的影响仅在四种环境中的一种环境下显著。我们的研究结果为在水稻育种计划中利用不同等位基因微调水稻抽穗期提供了有用信息。
