In:
Plant Disease, Scientific Societies, Vol. 85, No. 5 ( 2001-05), p. 506-512
Abstract:
Genetic resistance is the most economical approach to disease control. In breeding for disease resistance, we need to understand the biology of the pathogen population where the resistant cultivars are to be deployed. This approach allows pathologists and breeders to produce more long-lasting resistant cultivars as we identify resistance genes effective against the contemporary pathogen population. In this study, we characterized the population of Xanthomonas oryzae pv. oryzae, the causal organism of bacterial blight of rice, in three regions in eastern India using genetic analysis and inoculation of the bacterial isolates on cultivars that differentiate the pathogen isolates into pathotypes. Based on genetic analysis, the pathogen collection was differentiated into 17 DNA types and nine pathotypes with different virulence characteristics. Across the three regions in eastern India, the pathogen population from Orissa was the most diverse. The representative isolates from these pathotypes were used to identify effective resistance genes present in cultivars containing single resistance genes and combinations of two or three of these genes. Some pathogen isolates were found to overcome resistance governed by single genes, but that conferred by combinations of genes was effective against all isolates sampled in this study. Use of combinations of effective genes against the contemporary pathogen population could prolong the useful lifetime of the valuable resistance genes against the disease.
Type of Medium:
Online Resource
ISSN:
0191-2917
,
1943-7692
DOI:
10.1094/PDIS.2001.85.5.506
Language:
English
Publisher:
Scientific Societies
Publication Date:
2001
detail.hit.zdb_id:
2042679-3
Permalink