Identification of strains of tobacco mosaic virus (TMV) isolated from capsicums in south central China.

摘要

To differentiate tobacco mosaic tobamovirus (TMV) strains in south central China, strain identification of TMV isolates collected from fields of sweet peppers or chillies in Shanghai (30 鳱), Wuhan (30 鳱), Chengdu (30 鳱), Lhasa (30 鳱) and Dali (25 鳱) was performed using the series of TMV-resistant Capsicum spp. carrying the genes L+, L1, L2, L3 and L4, respectively. No isolates were identified as the P0 strain, because all of the TMV isolates were collected from cultivars with an L1 resistancegene. In contrast, it was shown that the P1 and P1,2 strains which can infect cultivars with the L1 resistance gene were widespread in south central China. In addition, the P1,2,3 strains which can break down the resistance of cultivars with the L3 resistance gene were also detected in Shanghai. No isolates were capable of infecting C. chacoense harbouring the L4 resistance gene. Based on a study of the variability of TMV strains in China, methods for the breeding of sweet pepper for TMV-resistance wereevaluated.