QTL mapping of yield-related traits in the wheat germplasm 3228 |
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| Authors: | Jiansheng?Wang Weihua?Liu Hui?Wang Email author" target="_blank">Lihui?LiEmail author Jun?Wu Xinmin?Yang Xiuquan?Li Ainong?Gao |
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| Institution: | (1) Institute of Crop Sciences, National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, Beijing, 100081, China;(2) College of Agronomy, Northwest Sci-Tech University of Agriculture and Forestry, Yangling, 712100, Shaanxi, China; |
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| Abstract: | The new wheat germplasm 3228, a putative derivative of tetraploid Agropyron cristatum Z559 and the common wheat Fukuhokomugi, has superior features in yield-related traits, particularly in spike morphological
traits, such as large spike and superior grain number. To identify favorable alleles of these traits in 3228, 237 F2:3 families were developed from the cross 3228/Jing 4839. A genetic map was constructed using 179 polymorphic SSR and EST-SSR
markers. A total of 76 QTL controlling spike number per plant (SNP), spike length (SL), spikelet number per spike (SNS), floret
number per spikelet (FNS), grain number per spike (GNS) and thousand-grain weight (TGW) were detected on 16 chromosomes. Each
QTL explained 1.24–27.01% of the phenotypic variation, and 9 QTL (28.95%) were detected in two or all environments. Additive
effects of 45 QTL were positive with 3228 alleles increasing the QTL effects, 31 QTL had negative effects indicating positive
contributions from Jing 4839. Three important clusters involving all traits were located on chromosomes 5A, 6A and 4B, and
several co-located QTL were also found. Most of the QTL detected on the three chromosome regions could contribute to the use
of 3228 in breeding for grain yield improvement. |
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