Sources of resistance to Septoria passerinii in Hordeum vulgare and H. vulgare subsp. spontaneum
1999
Toubia-Rahme, H. | Steffenson, B.J.
Septoria speckled leaf blotch (SSLB), incited by Septoria passerinii and Stagonospora avenae f. sp. triticea, has become one of the most serious diseases of barley in the Upper Midwest region of the USA. In barley SSLB can cause significant losses in both the yield and quality. The major malting and feed barley cultivars in the Upper Midwest are very susceptible to SSLB. Resistance breeding is the most effective strategy for controlling this disease. A diverse group of barley germplasm including Hordeum vulgare subsp. spontaneum accessions, advanced midwestern breeding lines, and commercial cultivars was evaluated at the seedling stage in the greenhouse for reaction to S. passerinii. Of 200 accessions tested, 79 were found resistant. Most of H. vulgare subsp. spontaneum accessions (17 of 24) were resistant to S. passerinii. These accessions all originated from the Middle East, except one that was from Tibet. Most of the advanced midwestern breeding lines found resistant to this pathogen have Gloria_S_/Copal_S_ (an ICARDA/CIMMYT barley line) in their pedigree, which is believed to be a source of resistance to S. passerinii. From this study, it is evident that many barley accessions possess resistance to S. passerinii. Additional evaluations will be made on this germplasm to S. avenae f. sp. triticea to identify accessions that possess effective resistance to both SSLB pathogens.
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