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GrainGenes Reference Report: CRS-42-730

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Reference	CRS-42-730
Title	Correlated responses to selection for greater beta-glucan content in two oat populations
Journal	Crop Science
Year	2002
Volume	42
Pages	730-738
Author	Cervantes-Martinez CT Frey KJ White PJ Wesenberg DM Holland JB
Abstract	Summary: Oat (Avena sativa L.) beta-glucan lowers serum cholesterol in humans. Thus, enhancing its content in oat cultivars for human consumption is desirable. Phenotypic selection for greater beta-glucan content was effective in two broad-based oat populations, BG1 and BG2. The initial and selected cycles of each of these populations were evaluated in 1996 and 1997 at two Iowa locations to determine the correlated responses of agronomic and grain quality traits to selection for greater beta-glucan content. Correlated responses were generally unfavorable for agronomic performance, but favorable in terms of human nutritional value of oat grain. Mean protein content increased by 5% in one population while mean oil content and heading date did not change. Mean grain yield, biomass, and test weight were reduced by 25, 23, and 2%, respectively, in one population and not affected in the other. Plant height decreased by 5% in one population only. Genotypic variances were unchanged by selection, except the genetic variance for plant height in BG2 increased. Selection strengthened negative genotypic correlations between beta-glucan content and grain yield, biomass, and oil content in both populations, and between beta-glucan content and test weight, heading date, and height in one population. Beta-Glucan yield (the product of beta-glucan content and grain yield) was positively genotypically correlated with both grain yield (r = 0.92 in both populations) and beta-glucan content (r = 0.66 and r = 0.26 in the two populations). Selection for greater beta-glucan yield could be used to improve beta-glucan content and grain yield simultaneously
Keyword	[ Hide all but 1 of 39 ] agronomic performance avena avena sativa beta-glucan beta-glucan content biomass cholesterol correlated response cycle date genetic variance grain quality heading heading date height human inheritance iowa oat oil oil content performance phenotypic selection plant height protein protein content protein yield quality quality traits recurrent selection responses selection sera serum serum-cholesterol test weight trait variance yield

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