Nature of wheat resistance to Fusarium head blight and the role of deoxynivalenol for breeding

作者：Ákos Mesterházy, Tibor Bartók, Chester J. Mirocha, R. Komoróczy · 发表于：Plant Breeding · 年份：1999 · DOI：10.1046/j.1439-0523.1999.118002097.x · 被引用次数：429 · 研究领域：Mycotoxins in Agriculture and Food、Wheat and Barley Genetics and Pathology、Plant Pathogens and Fungal Diseases

Abstract Twenty (1990‐93) and 25 (1994‐96) wheat genotypes with different degrees of resistance and origins were tested with seven and eight isolates, respectively, of Fusarium graminearum and four Fusarium culmorum isolates of diverse origin in Europe. Infection severity depended largely on the genotypes and the isolates used. Head blight values, yield response and kernel infection values revealed close but varying relationships with deoxynivalenol (DON) content. This variability is explained by the presence of tolerance mechanisms which affect the relationship between Fusarium head blight severity and yield response. Kernel infection resistance accounted for decreasing Fusarium head blight values. Genotypes were found with lower infection severity and higher DON contamination and vice versa. Evidently, the cultivar has a significant influence on DON production in the infected tissue, i.e. highly susceptible genotypes may have moderate or low accumulation of DON. However, in the most resistant genotypes showing no infection to any of the isolates or only sporadic symptom development, no or very low accumulation of DON was detected. Resistant genotypes gave a stable reaction with b‐values close to zero for all traits tested. Susceptible genotypes were unstable under different epidemic conditions and their stability was different for the traits investigated. Therefore, the mean of b‐values is suggested to better describe the stability of the wheat genotypes. Significant positi...