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Combined Gene Effects on Resistance against Erysiphe graminis DC. f. sp. hordei Marchal Analysed by Means of Double Mutants 1 )
Author(s) -
Heun M.,
Röbbelen G.
Publication year - 1984
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1984.tb00737.x
Subject(s) - haustorium , biology , powdery mildew , inoculation , mutant , erysiphe graminis , gene , virulence , plant disease resistance , botany , resistance (ecology) , microbiology and biotechnology , host (biology) , genetics , horticulture , hordeum vulgare , poaceae , agronomy
The effect of genes for resistance against powdery mildew of barley was determined microscopically in stained leaf segments 44 h after inoculation and compared with the visual was established between the number of haustoria and the visual disease symptoms. Deviations were expressed after C17 Am inoculation of the mutant B682, which exhibited low infection grade although high numbers of haustoria were formed; thus the induced resistance gene of B682 is expressed only in later stages of the infection process. On the other hand, after inoculation of SR1 with the ml‐o virulent isolate HL3 high infection grade was measured following low haustoria numbers; obivously, this isolate is able to grow more intensively after first haustoria have been formed.Consequently, the close relation between haustoria numbers and infection grade is reestablished in the double mutants under HL3 infection. The implications of this finding for resistance breeding are discussed.