EFFECT OF VEGETATIVE INCOMPATIBILITY 0N DOUBLE STRANDED RNA AND MYCOVIRUS TRANSMISSION IN GAEUMANNOMYCES GRAMINIS VAR.TRITICI.

Abstract

The vegetative incompatibility of Gaeumannomyces caminis (wheat plant pathogen) was examined by physical interaction of field isolates on potato agar. Due to multi-allelic system 31 isolates of Gaeumannomyces raminis var. mitici were divided into 18 vegetative incompatibility (V-C) groups. The genetic mechanism of somatic incompatibility appears to be heterogenic. Fusion incompatibility was rarely found. The dsRNA components from these isolates belonged to different V-C group e.g., 38 (V.C youp A) and 43 (V-C group B) are of the same size. Similar ly dsRNA components from isolates 87-I(V-C group F) and isolates 83(V-C group G) have same size range. The close similarity of the dsRNAs present in isolates from different VæC group suggests that somatic incompatibility cannot restrict the transmission of virus or viral genome (dsRNA).