PATHOTYPES OF COCHLIOBOLUS SATIVUS (SPOT BLOTCH) ON BARLEY IN SYRIA

M.I.E. Arabi, M. Jawhar

Abstract


In order to study the Syrian pathotype diversity of Cochliobolus sativus, the causal agent of barley spot blotch disease, a survey was conducted using 31 isolates and 13 barley genotypes. Four pathotypes (pt 1-4) were identified based on the lesion form and infection response of the genotypes with mean disease rating from 1.76 to 7.46. Pt 1 exhibited low virulence on all used genotypes, pts 2 and 3 were moderately virulent and pt 4 was highly virulent. The two most common pathotypes were pt 3 (35%) and pt 4 (42%). The barley genotype AECS 71 was highly resistant to all pathotypes suggesting the existence of a general resistance mechanism. This genotype may be recommended as a possible donor in breeding programmes. The information obtained from this study should facilitate deploying effective resistance to C. sativus in barley.

Keywords


Barley; Hordeum vulgare; virulence diversity; Cochliobolus sativus

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DOI: http://dx.doi.org/10.4454/jpp.v85i3.1030

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