Location and transmission of QTL for multiple traits in the pedigree of soybean cultivars

Abstract

In silico mapping for single trait was extended to analyze many agronomic traits in the pedigree of soybean. 26 agronomic traits were measured and 477 polymorphic markers chosen on public genetic map were genotyped on 14 inbreeding lines in the pedigree of Suinong14. We firstly determined 6 principal components from 26 agronomic traits using the principal component analysis and then constructed 6 ''super traits'' by the multiplication of the vector of the standardized original traits by the eigenvectors corresponding to the principle components. With in silico mapping, a total of 24 markers distributing on 13 linkage groups were detected separately as QTL responsible for 6 ''super traits'' and of which 14 QTL performed pleiotrpy. Tracing the transmission of functional genes in the pedigree, it was found that some genes were capable to explain the genetic mechanism for the contribution of exotic germplasms and domestic founders to soybean cultivars in the improvement of the performance and quality.