＇宁麦9号/扬麦158重组自交系群体产量性状的遗传解析

Ningmai 9 and Yangmai 158 are the main commercial wheat varieties, as well as the backbone parents in wheat breeding programs in the middle and lower reaches of the Yangtze River in China. Both of them have high yield potential, while they showed significant difference in yield components. To understand the genetic mechanism of their high yield potential, 282 recombinant inbred lines (RILs) derived from the cross between Ningmai 9 and Yangmai 158 were genotyped with the Illumina iSelect 90K wheat single nucleotide polymorphism (SNP) assay to construct a high-density genetic map. Yield (YD) and yield-related traits including spike number (SN), kernel number per spike (KN), and 1000-kernel weight (TKW) were evaluated for three consecutive growing seasons. The results indicated that the KN of Ningmai 9 was higher than that of Yangmai 158, while TKW was lower than that of Yangmai 158. In total, 9, 8, 10 and 12 QTLs associated with SN, KN, TKW and YD were identified by QTL mapping, respectively. Among these traits, TKW possessed the highest heritability, and three QTL associated with TKW were identified repetitively. The markers related to such QTLs were then transferred to Kompetitive Allele Specific PCR (KASP) markers for high throughput selection in 139 wheat accessions. It was indicated that pyramiding 2 or 3 QTLs was more effective than single QTL for TKW improvement. The results in this study could provide more information for marker assisted selection in wheat yield breeding program.