Comparative virulence of chlorosis-inducing races ofPyrenophora tritici-repentis

The gene coding for a new transcription factor (ftf1) of Fusarium oxysporum is only expressed during infection of common bean

“…There is some evidence that supports this hypothesis in P. triticis-repentis. Isolate 92-171R5 that was estimated to have two copies of ToxB is significantly less pathogenic than isolate Alg 3-24, that was estimated to have eight copies (Martinez et al, 2001(Martinez et al, , 2004Strelkov et al, 1999Strelkov et al, , 2002Strelkov and Lamari, 2003). Assuming that each hybridizing band of the Southern analysis shown in Fig.…”

Distribution of races and Tox genes in Pyrenophora tritici-repentis isolates from wheat in Argentina

“…Knowledge of pathogen variability is an important component for developing resistant cultivars (Araya 2003). Variability for virulence in P. tritici-repentis population have been reported in several countries (Lamari and Bernier 1989a, b;Strelkov et al 2002). Currently, eight races of P. tritici-repentis have been identified based on virulence patterns on a standard differential set of wheat cultivars worldwide Manning et al 2002;Strelkov et al 2002;Francl 2002, 2003;Andrie et al 2007;Gamba et al 2012).…”

“…Variability for virulence in P. tritici-repentis population have been reported in several countries (Lamari and Bernier 1989a, b;Strelkov et al 2002). Currently, eight races of P. tritici-repentis have been identified based on virulence patterns on a standard differential set of wheat cultivars worldwide Manning et al 2002;Strelkov et al 2002;Francl 2002, 2003;Andrie et al 2007;Gamba et al 2012). The ability of P. tritici-repentis to induce necrosis and chlorosis in wheat is correlated with the production of host selective toxins (HSTs) including Ptr ToxA, Ptr ToxB and Ptr ToxC (Ballance et al 1996;Ciuffetti et al 1997;Effertz et al 2002;Strelkov and Lamari 2003).…”

Pathogenic and molecular variability among isolates of Pyrenophora tritici-repentis, causal agent of tan spot of wheat in Argentina

“…In race characterization of this pathogen, several authors observed only isolates causing necrosis on wheat cv. Glenlea Francl 2002, 2003;Lamari and Bernier 1989a, b;Strelkov et al 2002). However, in this study we report not only isolates causing Nec alone, but also 16 isolates producing Cl and 12 causing NecCl on the wheat cv.…”

“…Physiological variation in virulence and/or aggressiveness in the P. triticirepentis population have been reported using both quantitative and qualitative scales de Wolf et al 1998;Diaz de Ackermann 1987;Krupinsky 1987Krupinsky , 1992Strelkov et al 2002). The tan spot syndrome consists of two phenotypically distinct and independent symptoms: tan necrosis and extensive chlorosis (Lamari and Bernier 1989b).…”