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Localization of a resistance gene and identification of sources of resistance to barley leaf stripe
Author(s) -
Thomsen S. B.,
Jensen H. P.,
Jensen J.,
Skou J. P.,
Jørgensen J. H.
Publication year - 1997
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1997.tb01030.x
Subject(s) - biology , powdery mildew , resistance (ecology) , gene , cultivar , hordeum vulgare , chromosome , botany , plant disease resistance , genetics , gene mapping , fungus , poaceae , agronomy
In order to determine more precisely the location of the barley leaf stripe gene, called the ‘Vada‐resistance gene’, on barley chromosome 2, 63 chromosome‐doubled barley lines were tested. Using data on known chromosome 2 genetic markers, the ‘Vada‐resistance gene’ was estimated to be located between the markers MSU21 and Xris45b, and at a distance of about 20% recombination from the powdery mildew resistance gene MILa. We suggest that the ‘Vada‐resistance gene’ is designated Rdg 1a and that all former leaf stripe resistance gene designations should be rejected. To identify possible new sources of resistance, 11 barley cultivars/lines known to possess leaf stripe resistance and originating from different parts of the world, were tested with one Danish and two Syrian isolates of the leaf stripe fungus. Three apparently genetically different sources of race‐specific resistance were found. The ‘Vada‐resistance’ in the cultivar ‘Golf was effective against seven out of eight isolates’ populations of the leaf stripe fungus differing in geographical origin.