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Selection for Resistance to Aphanomyces euteiches in Red Clover

Dep. of Agronomy, Univ. of Wisconsin-Madison, and USDA-ARS

C. R. Grau

Dep. of Plant Pathology, Univ. of Wisconsin-Madison, WI, 53706

^* Corresponding author.

Red clover (Trifolium pratense L.) is known to be a moderate host for Aphanomyces euteiches Drechs. Recently, an isolate of A. euteiches (Ae-572) was observed to be highly virulent on red clover. This research was conducted to determine inheritance of, and select for, resistance to A. euteiches in red clover using an inoculated seedling assay. Resistant and susceptible red clover plants were intercrossed to study the inheritance of resistance. Frequency distributions of resistant and susceptible F₁ plants indicated that resistance to A. euteiches is inherited as a quantitative trait. Three cycles of selection for resistance to A. euteiches in red clover resulted in significant improvement in resistance from the original selected population (Cycle 0 = 3.64 mean disease severity index (DSI); Cycle 3 = 2.43 mean DSI). Narrow-sense heritability estimates were high enough ((h²_n = 51% for Cycle 3) to assure that a recurrent selection program utilizing family selection could be used to improve red clover populations for resistance to A. euteiches.

Received for publication August 1, 1990.

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