Genes for scald resistance from wild barley (Hordeum vulgaresspspontaneum) and their linkage to isozyme markers
✍ Scribed by D. C. Abbott; A. H. D. Brown; J. J. Burdon
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 497 KB
- Volume
- 61
- Category
- Article
- ISSN
- 0014-2336
No coin nor oath required. For personal study only.
✦ Synopsis
Accessions of Hordeum vulgare ssp . spontaneum, the wild progenitor of barley, collected in Israel (70), Iran (15) and Turkey (6) were screened for seedling response to four isolates of Rhynchosporium secalis, the pathogen causing leaf scald in barley . Resistance was very common in the collection (77%) particularly among accessions from the more mesic sites (90%) . The genetics of this resistance were investigated in fifteen backcross (BC3) lines that contained an isozyme variant from H. v . ssp . spontaneum in a H . v . ssp . vulgare (cv . Clipper) background and were resistant to scald . Segregation in the BC3F2 families conformed with a single dominant resistance gene in 9 of the 15 lines . Scald resistance and the isozyme marker were closely linked in three of the BC 3 -lines, loosely linked in four and unlinked in the remaining eight . Scald resistance genes were identified on barley chromosomes 1, 3, 4 and 6 . Crosses between several of the scald resistant BC-lines together with the linkage data indicated that at least five genetically independent resistances are available for combining together for deployment in barley . The linkage of scald resistance in several BC 3 -lines to the isozyme locus Acp2 is of special interest as this locus is highly polymorphic in wild barley .