Bainsla Naresh Kumar, Yadav Rajbir, Singh Gyanendra Pratap, Sharma Ram Kumar
Division of Genetics, ICAR- Indian Agricultural Research Institute, New Delhi, 110012, India.
Indian Institute of Wheat and Barley Research, Karnal, 132001, India.
Sci Rep. 2020 Apr 30;10(1):7336. doi: 10.1038/s41598-020-64470-x.
Stem solidness in wheat is an important architectural trait to support the erect behavior of the plant. The varieties with high yield potential due to increased sink strength tend to lodge either because of poor anchorage or weak stem. The solid stem can partially counter the tradeoff between biomass driven yield gain irrespective of the plant height. Stem solidness being a complex trait with highly variable expressivity, understanding its genetic behavior in different genetic backgrounds is highly essential to integrate this trait in the breeding program. In this study, the expressivity of a solid stem in different internodes was investigated in nine F populations selected from 34 Fs (solid stem × hollow stem and hollow stem × hollow stem). The progeny of solid stem type F plants from hollow stem parents indicated the complementation of favorable alleles dispersed among the parents. Non-confirmation to digenic complementary (9:7) model of inheritance and polynomial distribution of the trait in all F populations indicates multiple factors complementation in the additive fashion for stem solidness.
小麦茎秆坚实度是支持植株直立生长的重要株型性状。由于库强度增加而具有高产潜力的品种往往会倒伏，原因要么是固着性差，要么是茎秆脆弱。坚实的茎秆可以部分抵消生物量驱动的产量增加与株高之间的权衡。茎秆坚实度是一个具有高度可变表达性的复杂性状，了解其在不同遗传背景下的遗传行为对于将该性状整合到育种计划中至关重要。在本研究中，从34个F2群体（实心茎×空心茎和空心茎×空心茎）中选出9个F2群体，研究了不同节间实心茎的表达性。空心茎亲本的实心茎型F2植株后代表明，有利等位基因在亲本之间呈互补分布。所有F2群体中该性状不符合双基因互补（9:7）遗传模式和多项式分布，表明茎秆坚实度存在多个因子以加性方式互补。
