Septoria tritici blotch (STB) caused by Mycosphaerella graminicola is a serious disease in some wheat-growing regions of Iran. Continuous monitoring of the fungus populations is indispensable to study the efficiency of known resistant cultivars and Stb genes. In this study, resistance
of 49 wheat genotypes, including 20 wheat differential cultivars worldwide and 29 other wheat genotypes, were studied to 19 M. graminicola isolates. Among 931 genotype–isolate interactions, 224 isolate-specific resistances (26%) were observed by comparing the means of disease
severity data using LSD1% and LSD5%. Iranian M. graminicola isolates showed new virulence patterns. All isolates were virulent to Stb2, Stb5, Stb6, Stb7, Stb13 and Stb14. Among wheat differentials, M3 was resistant to all
isolates, indicating that it has gene(s) with the most efficiency against Iranian isolates. Among other genotypes, two genotypes were resistant to all isolates. This suggests that these genotypes have efficient resistance gene(s) to Iranian M. graminicola isolates and could be used
as resistance sources to STB in Iran. They may be effective against other populations of M. graminicola worldwide.
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Document Type: Research Article
Department of Plant Pathology, Science and Research Branch, Islamic Azad University, Tehran, Iran
Department of Cereal Research, Seed and Plant Improvement Institute, Karaj, Iran
October 21, 2014
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