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Milling and Baking Quality Attributes of Soft Red Winter Wheat Bulk Populations and Derived Lines

Plant and Soil Sci. Dep., Montana State Univ., Bozeman, MT 59715
USDA-ARS, Soft Wheat Quality Lab., Ohio Agric. Res. and Dev. Center, Wooster, OH 44691

^* Corresponding author.

Little information is available concerning relationships between milling and baking quality of soft red winter (SRW) wheat (Triticum aestivum L.) bulk populations and quality of lines derived in subsequent generations. Experiments were conducted to determine if quality evaluation of F₄ bulk populations could provide useful information on quality potential of F₅ lines. This would allow SRW wheat breeders using bulk systems of generation advance to develop appropriate selection strategies. Fifty-eight F₄ SRW wheat bulk populations were grown at Plains, GA, in 1988–1989. Milling and baking quality of each population was evaluated at the USDA-ARS Soft Wheat Quality Laboratory. Random F_4:5 headrows from eight populations with diverse F₄ bulk quality characteristics were grown in 1989–1990 at Tifton, GA, and similarly evaluated for milling and baking quality. Except for flour protein concentration, quality attributes of F₄ bulk populations were signficantly correlated with means of F₅ lines derived from each population. Bulk populations with quality deficiencies produced higher proportions of lines with similar quality deficiencies. Higher proportions of lines with adequate and superior quality were identified in progenies of bulk populations having good quality. Milling and baking qualities of F₅ lines derived from populations with only 50% SRW wheat parentage were more variable and less predictable based on F₄ bulk evaluation than quality of F₅ lines derived from populations of 100% SRW wheat parentage. Milling and baking quality of F₄ bulk populations was indicative of the quality and potential of F₅ lines derived from each bulk. Bulk evaluation could be used to cull lowquality-potential populations before line derivation.

Received for publication September 12, 1991.

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