Pathogenicity of the Rhynchosporium secalis population in the Western Cape province of South Africa |
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| Authors: | B Robbertse CL Lennox AB van Jaarsveld PW Crous M van der Rijst |
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| Institution: | (1) SGI-Agricultural Research Council, Private Bag X29, Bethlehem, 9700, South Africa;(2) PPRI-Agricultural Research Council, Private Bag X5017, Stellenbosch, 7599, South Africa;(3) Sensako, P.O. Box 54, Gouda, 6821;(4) Department of Plant Pathology, University of Stellenbosch, Private Bag X1, Stellenbosch, 7602, South Africa;(5) Agrimetrics-Agricultural Research Council, Private Bag X5013, Stellenbosch, 7599, South Africa |
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| Abstract: | The virulence spectra of 50 Rhynchosporium secalis isolates from a population in the Western Cape province of South Africa were determined, and 21 races were detected when
evaluated against 17 differential cultivars. The virulence spectrum of the R. secalis population shows considerable variation, and carries unnecessary virulence genes which is quite unexpected, since chiefly
susceptible barley cultivars are grown in the south Western Cape. The two most prevalent races, namely races 4 and 7 had three
and four virulence genes respectively. Both race 4 and 7 were virulent on the most susceptible cultivars, West China, Steudelli,
C.I.8618 and C.I.2226. Considering the resistance genes reported for the cultivars Atlas 46, Turk, and C.I.3515 which showed
no susceptible cultivar-pathogen interaction, it would appear that the Rh-Rh3-Rh4 complex is primarily involved in conferring resistance to the local R. secalis isolates
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | barley resistance Rhynchosporium secalis scald virulence spectrum |
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