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GrainGenes Reference Report: CRS-41-1041

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Reference	CRS-41-1041
Title	Genetic relationships of crown rust resistance, grain yield, test weight, and seed weight in oat
Journal	Crop Science
Year	2001
Volume	41
Pages	1041-1050
Author	Holland JB Munkvold GP
Abstract	Summary: Integrating selection for agronomic performance and quantitative resistance to crown rust, caused by Puccinia coronata Corda var. avenae W.P. Fraser & Ledingham, in oat (Avena sativa L.) requires an understanding of their genetic relationships. This study was conducted to investigate the genetic relationships of crown rust resistance, grain yield, test weight, and seed weight under both inoculated and fungicide-treated conditions. A Design II mating was performed between 10 oat lines with putative partial resistance to crown rust and nine lines with superior grain yield and grain quality potential. Progenies from this mating were evaluated in both crown rust-inoculated and fungicide-treated plots in four Iowa environments to estimate genetic effects and phenotypic correlations between crown rust resistance and grain yield, seed weight, and test weight under either infection or fungicide-treated conditions. Lines from a random-mated population derived from the same parents were evaluated in three Iowa environments to estimate heritabilities of, and genetic correlations between, these traits. Resistance to crown rust, as measured by area under the disease progress curve (AUDPC), was highly heritable (H = 0.89 on an entry-mean basis), and was favorably correlated with grain yield, seed weight, and test weight measured in crown rust-inoculated plots. AUDPC was unfavorably correlated or uncorrelated with grain yield, test weight, and seed weight measured in fungicide-treated plots. To improve simultaneously crown rust resistance, grain yield, and seed weight under both lower and higher levels of crown rust infection, an optimum selection index can be developed with the genetic parameters estimated in this study
Keyword	[ Hide all but 1 of 43 ] agronomic performance audpc avena avena sativa crown crown rust crown rust resistance design disease environment f-sp avenae genetic correlation genetic effects genetic parameters genetic relationship grain quality grain yield heritability index infection iowa oat parameters partial resistance performance phenotypic correlation population progeny puccinia puccinia coronata quality quantitative resistance relationships resistance rust rust resistance seed seed weight selection stress test weight trait yield

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