Vegetative Compatibility Groups and Virulence Variation Among Isolates of Pyrenophora graminea

Abstract

Pyrenophora graminea, the causal agent of leaf stripe disease, is an economically important pathogen of barley found worldwide. Forty-four isolates of diverse geographical origin within Syria were grouped into vegetative compatibility groups (VCGs) by demonstrating heterokaryosis by complementation tests using nitrate nonutilizing (nit) mutants. All isolates were grouped into three VCGs-1-A, 1-B and 1-C. No self-incompatibility was observed in any of the isolates tested. VCG 1-A was the most common group within growing regions in Syria and proved to be the most virulent of the VCGs identified. These data indicate that the level of virulence in P. graminea is related to VCG.

Detection of some registered barley varieties reactions to barley leaf stripe disease

“…is crucial because it is the most efficient and environmentallyfriendly approach (Arabi and Jawhar 2005). In addition to developing cultivars, it is important to obtain knowledge about the virulence of the disease agent (Arabi and Jawhar 2012;Mokrani et al 2012;Nielsen et al 2002).…”