Major-effect QTLs for stem and foliage resistance to late blight in the wild potato relatives Solanum sparsipilum and S. spegazzinii are mapped to chromosome X

作者：Danan Sarah; Chauvin Jean Eric; Caromel Bernard; Moal Jean Denis; Pelle Roland; Lefebvre Veronique^*

来源：Theoretical and Applied Genetics, 2009, 119(4): 705-719.

DOI：10.1007/s00122-009-1081-7

To find out new resistance sources to late blight in the wild germplasm for potato breeding, we examined the polygenic resistance of Solanum sparsipilum and S. spegazzinii by a quantitative trait locus (QTL) analysis. We performed stem and foliage tests under controlled conditions in two diploid mapping progenies. Four traits were selected for QTL detection. A total of 30 QTLs were mapped, with a large-effect QTL region on chromosome X detected in both potato relatives. The mapping of literature-derived markers highlighted colinearities with published late blight QTLs or R-genes. Results showed (a) the resistance potential of S. sparsipilum and S. spegazzinii for late blight control, and (b) the efficacy of the stem test as a complement to the foliage test to break down the complex late blight resistance into elementary components. The relationships of late blight resistance QTLs with R-genes and maturity QTLs are discussed.

• 出版日期2009-8