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Temporary partial breakdown of mlo ‐resistance in spring barley by sudden relief of soil water‐stress under field conditions: the effects of genetic background and mlo allele
Author(s) -
Baker S. J.,
Newton A. C.,
Crabb D.,
Guy D. C.,
Jefferies R. A.,
Mackerron D. K. L.,
Thomas W. T. B.,
Gurr S. J.
Publication year - 1998
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.1365-3059.1998.00261.x
Subject(s) - powdery mildew , biology , mildew , blumeria graminis , allele , genotype , cultivar , horticulture , resistance (ecology) , agronomy , tiller (botany) , botany , plant disease resistance , gene , genetics
This study, carried out under field conditions, assessed the extent to which temporary breakdown of mlo‐ resistance, following relief of water‐stress, was determined by genetic background and mlo allele. Commercial barley cultivars expressing the mlo gene for resistance to powdery mildew ( Erysiphe graminis ( Blumeria graminis ) f.sp. hordei ) were tested as well as doubled haploid progeny from spring barley genotypes, a proportion of which were sown in the field in two successive years. Plants were protected from natural rain by a mobile rain shelter and either watered by trickle‐irrigation or allowed to dry. Percentage mildew infection resulting from natural inoculum was recorded and the doubled haploid genotypes were classified as resistant, intermediate or susceptible on the basis of their control (watered) treatment scores. In each of the three designated classes, particular genotypes developed infection levels, following relief of water‐stress, that were higher than those observed on the well‐watered controls. This was found not to be related to the mlo allele as there was no significant difference between the increases observed on resistant plants carrying mlo9 and resistant plants carrying mlo11 . Differences in the degree of breakdown of resistance were attributed to genetic background rather than to the specific mlo allele.