Premium
Evidence of Pathogen Specificity in Tolerance of Soybean Cultivars to Phytophthora Rot
Author(s) -
Thomison P. R.,
Thomas C. A.,
Kenworthy W. J.,
McIntosh M. S.
Publication year - 1988
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1988.0011183x002800040034x
Subject(s) - biology , phytophthora megasperma , cultivar , pathogen , virulence , phytophthora sojae , phytophthora , botany , horticulture , phycomycetes , microbiology and biotechnology , inoculation , gene , genetics
The recent appearance of new races of the soybean [ Glycine max (L.) Merr.] pathogen Phytophthora megasperma f.sp. glycinea (Pmg) has prompted breeders to consider the use of tolerance as an alternative to race‐specific resistance. The objective of this study was to evaluate the tolerance of cultivars to different isolates and races of Pmg . The tolerance reactions of ‘Essex’, ‘Williams’, ‘York’, and ‘Ware’ to isolates of Races 1, 5, 10, and 24 were determined by transplanting 4‐d‐old seedlings into media infested with Pmg and measuring the effect on plant growth. The reactions indicate that some isolates differ only in virulence and that others differ in pathogenicity. Soybean cultivars selected for tolerance to a limited number of Pmg isolates/races may not necessarily be tolerant to others.