Tan spot, caused by Pyrenophora tritici-repentis, is an economically important foliar disease of wheat worldwide. Eight races of the pathogen have been characterized on the basis of their ability to cause necrosis or chlorosis in a set of differential wheat lines. Race 1 produces two host-selective toxins, Ptr ToxA and Ptr ToxC, that induce necrosis and chlorosis, respectively, on leaves of sen...

Tan spot, caused by the fungus Pyrenophora triticirepentis, is economically important foliar disease in Latvia, Lithuania, and Romania; however, race structure from Baltic States and Romania is not known. In this study, we performed genotypic and phenotypic race characterization of a large collection of P. triticirepentis isolates from these countries to determine race structure and utilize thi...

Pyrenophora tritici-repentis (Ptr), a necrotrophic fungus and the causal agent of tan spot of wheat, produces one or a combination of host-selective toxins (HSTs) necessary for disease development. The two most studied toxins produced by Ptr, Ptr ToxA (ToxA) and Ptr ToxB (ToxB), are proteins that cause necrotic or chlorotic symptoms respectively. Investigation of host responses induced by HSTs ...

M. V. Moreno1,2,3, S. A. Stenglein1,2,3 and A. E. Perelló1,4 1Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) 2Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CEBB-CONICET, Facultad de Agronomía de Azul Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA) 3Microbiología Agrícola, Facultad de Agronomía, UNCPBA 4Centro de Investigaciones de Fito...

During the study on rust mycobiota of Central Alborz, several rust infected specimens belonging to Salicaceae family including Populus and Salix species were investigated. Populus nigra, P. euphratica, Saix alba and S. excelsa were infected by various Melampsora species. Uredinial (II) and telial (III) stages of rust were present on infected plants. According to morphological characters, five f...

Abstract In recent years, tan spot of wheat caused by the fungus Pyrenophora tritici-repentis has become more prevalent in Oklahoma. Experiments were conducted to investigate race structure, disease symptoms and genetic variability P. isolates collected from winter over three decades. Race determination was for 16 based on expression necrosis and/or chlorosis produced differentials. Variability...