QTL analysis reveals quantitative resistant loci for Phytophthora infestans and Tecia solanivora in tetraploid potato - Conference Paper uri icon

Resumen

  • Late blight, caused by Phytophthora infestans, and Guatemalan potato tuber moth, caused by Tecia solanivora, are the main problems in the potato crop in Colombia. To understand the genetic basis of resistance to P. infestans and T. solanivora in potato, this research aimed to identify QTL for late blight and Guatemalan potato tuber moth resistance using the F1 tetraploid population Roja Nariño × 2384. The severity and incidence of the P. infestans and T. solanivora infections were evaluated in two crop cycles. The severity, incidence and number of outflow holes were also evaluated in stored tubers. The parents and the F1 population were genotyped using a 12K SNP chip. A genetic linkage map with a length of 968.4 cM was constructed with 1,287 SNPs using the software TetraploidMap and the physical map for potato (PGSC v4.03). The QTL analysis revealed six QTL linked to P. infestans on chromosomes 1, 3, 5 and 8. The most important QTL were qrAUDPC-1 and qrAUDPC-3.2. Additionally, 15 QTL related to T. solanivora were mapped on chromosomes 1, 2, 3, 4, 6, 7, 9, 10 and 12. The QTL that most explained the phenotypic variance were qIPC-7, qIPA-2.1 and qOPA-7.1 with a proportion of 11.45%, 12.99%, 10.37%, respectively. According to our understanding, this is the first study that maps QTL for resistance to T. solanivora Thus, these results may contribute to potato breeding programs, especially in countries where P. infestans and T. solanivora are an important factor limiting potato production.

Fecha de publicación

  • 2018