| As an important index of wheat breeding, plant height (PH) has great influence on yield. In order to further explore the quantitative trait loci (QTL) of PH in wheat, a recombinant inbred line (RIL) population consisting of 205 lines was constructed by crossing Yangmai 12 (YM12) and Yanzhan 1 (YZ1).55K SNP chip was used to construct the highly density genetic map of wheat, and QTL for PH traits were analyzed based on data from six environments in three years. Seven QTL related to PH were detected on chromosomes 2B (1), 4B (1), 4D (1), 5A (1), 5B (1) and 7D (2). The dwarfing alleles of QPh.yaas-4B, QPh.yaas-5A, and QPh.yaas-7D.1 were derived from YM12, and the dwarfing alleles of the other four PH QTL were derived from YZ1. QPh.yaas-4B and QPh.yaas-4D were detected in all environments, explaining the phenotypic variation explained rates of 14.50%-24.09% and 19.01%-29.80%, respectively. QPh.yaas-4B and QPh.yaas-4D are Rht1 and Rht2, respectively. QPh.yaas-5A was detected in five environments, with PVE ranging from 3.29% to 5.36%. QPh.yaas-2D and QPh.yaas-7D.2 were detected in four environments, with PVE ranging from 3.45%-6.14% and 3.16%-4.10%, respectively. QPh.yaas-5B and QPh.yaas-7D.1 were detected in two and three environments, with PVE ranging from 2.27%-5.09 % and 2.72%-4.82%, respectively. QPh.yaas-7D.1 and QPh.yaas-7D.2 may be two novel PH QTL after comparison with the previously published PH QTL. To investigate the effects of Rht-B1 and Rht-D1 on thousand-grain weight, spike length and grain number per spike, it was found that Rht-B1 had no significant effect on the above agronomic traits; Rht-D1 had significant effect only on TGW, with the increased PH and TGW. Validation of the effect results of Rht-B1 and Rht-D1 in the natural population was consistent with that in the RIL population. |
基本信息
