Different Genetic Mechanisms Control Foliar and Tuber Resistance to Phytophthora infestans in Wild Potato Solanum verrucosum
Liu. Z Halterman. D
American Journal of Potato Research ; 2009 [Vol.86] Pages:476-480
Abstract
Late blight, caused by the oomycete pathogen, Phytophthora infestans, is a devastating disease of potatoes and tomatoes. A key long-term management strategy for combating this disease is to develop potato cultivars with broad-spectrum and durable resistance through identification and integration of major resistance genes. In support of previous results, we have determined that some accessions of the wild potato species Solanum verrucosum contain strong foliar resistance to P. infestans while others are susceptible. In addition, whole- and wounded-tuber inoculations revealed that most accessions lacked resistance to tuber infection. However, one accession (PI 570643) contained little foliar resistance but expressed tuber resistance, suggesting that expression of these two phenotypes in this species is not correlated.
Full Text