QTL Mapping and Genomic Selection of Maize Plant Height Based on F2∶3 Haploid Population
Haploids derived from the F2∶3 families of the maize elite inbred lines Zheng 58 and B73 were used for QTL mapping and GS in this study.A total of 8 QTLs related to plant height were mapped on chromosomes 1,4,5,7 and 10 by inclusive composite interval mapping(ICIM).The phenotypic variation explained(PVE)value of each QTL ranged from 3.98％to 21.04％.The QTL qPH4-2 was mapped in multiple environments with PVE value rang-ing from 14％to 21％,which was a major QTL.Another major QTL qPH4-1 located at bin 4.08 contains the candi-date gene GRMZM2G393337,which can inhibit cell elongation and lead to dwarfing.RRBLUP model was used for GS of haploids plant height of the F2∶3 families,and the average prediction accuracy of five-fold cross validation was 0.50.When the training population size and marker density increase,the prediction accuracy would first increase rapidly then tend to be flat.When 60％of the total genotypes were used as the training population or 300 SNP mark-ers were used,a relative high prediction accuracy can be achieved.
万方数据
