The virulence spectrum of Puccinia graminis tritici in Serbia [Yugoslavia]
1998
Kokic, M.
The obtained results confirmed assumption, that only by knowledge of the Puccinia graminis tritici virulence spectrum, could be identified Sr genes for use in the program of wheat breeding. The population of parasites was middle virulent, with tendency of virulent pathotypes increasing, and consisted from high number of pathotypes with different virulence. Among identified races on wheat in 1991, 37 different biotypes were established. In 1991, prevalent were biotypes RKK, RHT and RKT, and in 1992, RHT and RHS. Biotype RHT was prevalent in both years. The structure of population virulence in 1991, on wheat, consisted of pathotypes with 7-12 genes of virulence. The most frequent in population were genes V7b, V21 and V9g. In 1992, investigated population consisted from pathotypes virulent for 21 genes of resistance. Genes V7b, V21, V6, V9g, V1 and V6 were the most frequent. In both years, the virulence genes V7b, V21 and V9g were the most frequent in population. In 1992, on Berberis were identified 9 biotypes of which the most frequent was BBB. A half of total number of isolates, consisted biotypes of parasites without virulent genes. The most frequent genes were V5 and V6. In the structure of fungus population virulence on grasses, in 1991, the most frequent genes were V5 and V6, and in 1992, genes V5, V7b, V6 and V9g. In both years, the majority of genotypes had genes only for avirulence. The most frequent was biotype BBB. From the known Sr genes of resistance, no one was completely effective to investigate isolates. Genes Sr 9e, Sr33, Sr31 and Sr32, appeared as the most effective, because in population of parasites was few genes of virulence for them.
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