Races of Pyrenophora tritici-repentis in the Czech Republic

J Šárová,A Hanzalová,P Bartoš

doi:10.5586/aa.2005.011

J Šárová, A Hanzalová + Show 1 more

Open Access

https://doi.org/10.5586/aa.2005.011

Copy DOI

Abstract

Pyrenophora tritici-repentis, causal agent of tan spot, is one of the most important wheat leaf spot pathogens worldwide. The race structure of P. tritici-repentis isolates obtained from wheat (except one from noncereal grass species) in the Czech Republic was studied. The 86 monosporic isolates of P. tritici-repentis originated from different parts of the Czech Republic were grouped into five known races based on necrosis/chlorosis induction on standard differentials (Katepwa, Glenlea, 6B365, Salamouni). The isolates recovered from wheat were races 1, 2 and 4. Race 1 was the most frequent (50%), races 2 and 4 were found rarely (3% and 5% respectively). The isolate of P. tritici-repentis recovered from noncereal grass species was determined as race 4 which seems to be typical for noncereal hosts. The reaction of 30 isolates (42%) was difficult to be compared to reactions of so far identified P. tritici-repentis races. They have to be tested again on additional wheat genotypes.

Highlights

The fungal foliar pathogen Pyrenophora tritici-repentis (Died.) Drechs
The race structure of P. tritici-repentis population on wheat has been studied in the Czech Republic since 2001
The reactions of 86 monosporic P. tritici-repentis isolates coming from different parts of the Czech Republic to the differential set were analyzed

Summary

Introduction

The fungal foliar pathogen Pyrenophora tritici-repentis (Died.) Drechs. Drechslera tritici-repentis (Died.) Shoem.) is the causal agent of tan spot of wheat. This disease is one of the most important diseases caused by wheat leaf spot pathogens worldwide. In the Czech Republic P. tritici-repentis has been determined more and more often since about 1998 (Šárová et al, 2003). Tan spot has become a new problem in the Czech Republic but in many European countries too (Zamorski and Schollenberger , 1994; Bakonyi et al, 1998; Mikhailova and Prigorovskaya , 2000), in the last few years. The development of resistant cultivars to Pyrenophora tritici-repentis is thought to be the best way to reduce yield losses caused by tan spot (D e Wo l f et al, 1998)

Objectives

Methods

Results

Conclusion