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Modified Recurrent Selection for Barley Yellow Dwarf Virus Tolerance in Winter Wheat

Dep. of Plant Pathology, 139 Funches Hall, Auburn Univ., Auburn, AL 36849
Dep. of Agronomy, 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801
USDA-ARS, Crop Protection Res. Unit and Dep of Plant Pathology, Univ. of Illinois, Urbana, IL 61801
HybriTech Seeds Intl Inc., 6025 W. 300 S., Lafayette, IN 47905

^* Corresponding author.

Barley yellow dwarf virus (BYDV) causes an economically important disease of small grains. We evaluated tolerance to BYDV in a winter wheat population resulting from modified recurrent selection. Chemical hybridizing agents (CHAs) were used to facilitate recombination, and selection was based on tolerant genotypes producing more seeds under disease pressure. Seventeen parents, selected for BYDV tolerance, were mated in a partial diallel, with equal amounts of seed from F₁ plants constituting the original population. Bulked seed from F₁ plants was planted in rows in the field. Female rows were sprayed with a CHA (either RH-0007 or MON 21200) and inoculated with BYDV-PAV-IL. Seed was harvested from female rows. Our objectives were to determine if BYDV tolerance increased over cycles, if plant height and heading date were affected by the selection scheme, and if environmental effects were greater than genotypic effects for symptom expression. For evaluation, the original parents and S_1:2 lines from Cycles 2, 3, and 4 were planted in paired hills (one hill in each pair was inoculated with BYDV) in a randomized complete block design. The experiment was repeated with S_2:3 lines. No consistent improvements occurred over cycles in early or late disease ratings or yield of inoculated hills. Stunting was reduced from 6.0% in the parent population to 0.8% in Cycle 3 in the S_2:3 lines. In comparison with Cycle 2, average heading date in Cycle 4 was delayed by about 2 d. The modified recurrent selection scheme used was not effective in increasing the level of tolerance to BYDV, perhaps because of the limited genotypic variability among the parents, or the use of indirect selection for the number of seeds produced under disease pressure rather than BYDV symptoms.

Received for publication October 15, 1992.