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Crossa, J.

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Crossa
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Crossa, J.
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0000-0001-9429-5855

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    Pathogenicity and virulence of eight Fusarium graminearum isolates originating in four regions of Mexico
    (CIMMYT, 1998) Gilchrist-Saavedra, L.; Velazquez, C.; López, R.; Crossa, J.; Vargas Hernández, M.
    The expression of wheat (Triticum aestivum L.) host plant resistance to head blight caused by Fusarium graminearum Schw. varies widely, depending on environmental conditions (e.g., rainfall, temperature) and the inoculum used (age, concentration, incremental substrate, and isolate composition). It is important to have good control of these factors to avoid variation in the expression of resistance. However, controlling the inoculum applied is more complicated than it might seem at first glance. At present, a mixture of highly virulent pathogen isolates is commonly used as inoculum in screening wheat for head blight resistance in the belief that there are no vertical races in F. graminearum, as noted in the literature. There are, nonetheless, significant differences in pathogenicity among isolates that can greatly influence measurement of resistance levels (Mesterhazy, 1997). The authors of this study frequently observed differences in the response of varieties to the mixture of isolates used. This made them suspect the existence of significant cultivar x isolate interaction. They therefore initiated a preliminary study aimed at determining the cause of the observed differential in varietal response. The objective of the study was to evaluate the pathogenicity and virulence of F. graminearum isolates from different regions of Mexico on four resistant wheat cultivars.
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