杂种优势
生物
上位性
混合的
数量性状位点
遗传学
水稻
基因座(遗传学)
特质
生物技术
基因
农学
计算机科学
程序设计语言
作者
Xianmeng Wang,Tianhao Zhou,Guangwei Li,Wen Yao,Wei Hu,Xin Wei,Jian-Ping Che,Haichuan Yang,Lin Shao,Jinping Hua,Xianghua Li,Jinghua Xiao,Yongzhong Xing,Yidan Ouyang,Qifa Zhang
出处
期刊:Plant Journal
[Wiley]
日期:2022-08-25
卷期号:112 (1): 68-83
被引量:1
摘要
Heterosis refers to the superior performance of hybrids over their parents, which is a general phenomenon occurring in diverse organisms. Many commercial hybrids produce high yield without delayed flowering, which we refer to as optimal heterosis and is desired in hybrid breeding. Here, we attempted to illustrate the genomic basis of optimal heterosis by reinvestigating the single-locus quantitative trait loci and digenic interactions of two traits, the number of spikelets per panicle (SP) and heading date (HD), using recombinant inbred lines and 'immortalized F2 s' derived from the elite rice (Oryza sativa) hybrid Shanyou 63. Our analysis revealed a regulatory network that may provide an approximation to the genetic constitution of the optimal heterosis observed in this hybrid. In this network, Ghd7 works as the core element, and three other genes, Ghd7.1, Hd1, and Hd3a/RFT1, also have major roles. The effects of positive dominance by Ghd7 and Ghd7.1 and negative dominance by Hd1 and Hd3a/RFT1 in the hybrid background contribute the major part to the high SP without delaying HD; numerous epistatic interactions, most of which involve Ghd7, also play important roles collectively. The results expand our understanding of the genic interaction networks underlying hybrid rice breeding programs, which may be very useful in future crop genetic improvement.
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