Liu Zihui, Zhao Peng, Lai Xiangjun, Wang Xiaoming, Ji Wanquan, Xu Shengbao
State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, People's Republic of China.
Theor Appl Genet. 2023 Mar 10;136(3):32. doi: 10.1007/s00122-023-04274-5.
QPL_6D.1b displayed an additive effect with Rht-B1b and Rht-D1b in reducing wheat plant height and peduncle length, which confers shorter peduncle length and more kernels per spike, and had been broadly selected by Chinese modern wheat cultivars. Peduncle length (PL), as the key component of wheat plant height (PH), plays critical role in determining wheat lodging resistance and wheat pathogen resistance; then, its breeding selection and genetic basis remain largely unclear. Here the PH and PL were investigated in 406 wheat accessions in eight environments. In this study, a PL preferentially QTL QPL_6D.1 was identified in six environments by GWAS, which explained 13.6-24.2% of wheat PL variations in natural population. The allele QPL_6D.1b displayed a significantly additive effect with Rht-B1b and Rht-D1b in controlling PH and PL and could freely combined with Rht-B1b and Rht-D1b in current wheat cultivars. Haplotypic analysis demonstrates the QPL_6D.1b has been selected by Chinese modern wheat cultivar and confers shorter PL and more kernels per spike, highlighting its potentials in wheat breeding.
QPL_6D.1b在降低小麦株高和穗下节长度方面与Rht - B1b和Rht - D1b表现出累加效应，这使得穗下节长度更短且每穗粒数更多，并且已被中国现代小麦品种广泛选择。穗下节长度（PL）作为小麦株高（PH）的关键组成部分，在决定小麦抗倒伏性和抗病性方面起着关键作用；然而，其育种选择和遗传基础在很大程度上仍不清楚。在此对406份小麦种质在8种环境下的株高和穗下节长度进行了研究。在本研究中，通过全基因组关联研究（GWAS）在6种环境中鉴定出一个优先影响穗下节长度的QTL QPL_6D.1，其解释了自然群体中小麦穗下节长度变异的13.6 - 24.2%。等位基因QPL_6D.1b在控制株高和穗下节长度方面与Rht - B1b和Rht - D1b表现出显著的累加效应，并且在当前小麦品种中可与Rht - B1b和Rht - D1b自由组合。单倍型分析表明QPL_6D.1b已被中国现代小麦品种选择，并且赋予了更短的穗下节长度和更多的每穗粒数，突出了其在小麦育种中的潜力。
