| Both Yangmai 17 and Ningmai 18 are high-yielding wheat varieties. To study the genetic mechanism of plant height,the population of 310 F2 and its F2:3 generations derived from the hybridization between Yangmai 17 and Ningmai 18 were used to detect the quantitative trait loci(QTLs) for plant height. A genetic linkage map covering 19 chromosomes of wheat was established,and QTL mapping of plant height traits was carried out. A total of eight plant height QTLs were mapped by Composite Interval Mapping(CIM) based on the genetic map and phenotypic data,which are located on 2D,4B,5A,5B and 7A chromosomes,and four QTLs were detected in both generations. QPh-YN-5A.1 is a main-effect QTL,explaining 14.36% and 20.46% of the phenotypic variances,the dwarfing effect of which was contributed by Yangmai 17. QPh-YN-2D.1, QPh-YN-5B.2 and QPh-YN-7A explained 2.84% and 6.37%,4.26% and 5.46%,2.15% and 3.16% of the phenotypic variances respectively,the dwarfing effect of which was contributed by Ningmai 18. Four QTLs were detected only in a single generation. QPh-YN-2D.2, QPh-YN-4B and QPh-YN-5B.1 explained 5.05%,11.24% and 4.62% of the phenotypic variances respectively,the dwarfing effect of which was contributed by Ningmai 18. QPh-YN-5A.2 explained 7.72% of the phenotypic variances,the dwarfing effect of which was contributed by Yangmai 17. |
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