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Plant Pathology Journal
  Year: 2004 | Volume: 3 | Issue: 1 | Page No.: 26-34
DOI: 10.3923/ppj.2004.26.34
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Phenotypic Diversity in Rhynchosporium secalis from Ethiopia and Host Response to Barley Scald

Kiros Meles, M. Hulluka and M.M. Abang

Knowledge of Rhynchosporium secalis variability and host response to scald is important in the context of breeding for resistance. The variation in R. secalis isolates from barley in different agroecological zones of Ethiopia was investigated with respect to colony and conidial morphology, colony growth rate, sporulation and virulence spectrum on a set of ten barley differentials. The R. secalis isolates differed markedly in several cultural characteristics but no correlation was found between these characteristics and isolate virulence. Five R. secalis pathotypes were selected from a total of 19 pathotypes and used to screen 35 barley lines in a glasshouse and also under natural infection in the field. Discriminant analysis revealed considerable divergence in host response, as well as in R. secalis virulence. Percent leaf area affected (PLAA) and area under the disease progress curve (AUDPC) were negatively correlated with grain yield and 1000-grain weight and more closely reflected host resistance than apparent infection rate (r). High yielding barley lines such as HB-100 that showed resistance to all five pathotypes in the glasshouse and had low AUDPC, r and PLAA values in the field appear promising as donors of quantitative resistance genes in scald resistance breeding in the high altitude zones of Ethiopia.
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How to cite this article:

Kiros Meles, M. Hulluka and M.M. Abang, 2004. Phenotypic Diversity in Rhynchosporium secalis from Ethiopia and Host Response to Barley Scald. Plant Pathology Journal, 3: 26-34.

DOI: 10.3923/ppj.2004.26.34






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