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Inheritance of Reaction to Strawbreaker Foot Rot in Two Wheat Populations

USDA-ARS, Wheat Genetics, Quality, Physiology, and Disease Res. Unit, Pullman, WA 99164-6420

^* Corresponding author.

Strawbreaker foot rot (Pseudocercosporella herpotrichoides), the most important soilborne disease of fall-sown wheat (Triticum aestivum L.) in northwestern USA, can best be controlled by host resistance. ‘Cerco’ and VPM germplasm are important sources of resistance. This study was conducted to determine genetic control of their reaction to the fungus and devise breeding strategy to exploit their resistance. Intermediate to high heritability (h²) values (0.57 to 0.84) were obtained for lesion indices assessed on calms of mature plants of F₂ derived F₃, F₄, and F₅ progenies of the crosses VPM/ ‘Moisson’ 421 (resistant)//Sel.101 (susceptible) and VPM/Moisson 951 (resistant)//Cerco (moderately resistant). The cross between VPM derivative and the susceptible parent concurred with other studies indicating that a single dominant gene controlled the expression of strawbreaker lesion index. The lesion index segregation patterns of the VPM/Moisson 951//Cerco cross revealed that the resistances of the two parents were genetically different. Some progeny may exceed VPM/Moisson 951 for resistance. Significant associations were measured between lesion index and six agronomic traits in one or more generations of both crosses, however, only percent lodging and a rating of strawbreaker symptoms had value as correlated responses with lesion index. A recommended approach would be to select for absence of lodging and strawbreaker symptoms in early generations among lines grown under strawbreaker conditions and limit scoring of lesions to advanced lines.

Received for publication July 30, 1990.