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Specific adaptation by Mycosphaerella graminicola to a resistant wheat cultivar
Author(s) -
Cowger C.,
Hoffer M. E.,
Mundt C. C.
Publication year - 2000
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1046/j.1365-3059.2000.00472.x
Subject(s) - biology , cultivar , mycosphaerella graminicola , graminicola , population , inoculation , virulence , botany , mycosphaerella , agronomy , horticulture , gene , genetics , demography , sociology
Three cultivars of winter bread wheat (Gene, Madsen and Stephens) were each inoculated as seedlings in the greenhouse with seven or eight individual isolates of Mycosphaerella graminicola collected in 1997 from each of the same cultivars in the field. Isolates collected from Gene were virulent to all three cultivars, while isolates obtained from Madsen and Stephens were virulent to those two cultivars and, in all but one case, avirulent to Gene. At its release in 1992, Gene was resistant to M. graminicola , as indicated by both field observations and greenhouse tests, but by 1995 its resistance had substantially deteriorated. This indicated that its resistance was vertical ( sensu Vanderplank) or race‐specific, and that commercial cultivation of Gene rapidly selected for strains in the local M. graminicola population that were specifically adapted to overcome its resistance.