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Genetic Control for Percentage Groat Protein in 424 Advanced Generation Lines From an Oat Cross¹

A population of 424 advanced generation lines from an oat (Avena spp.) cross between high and low protein parents was developed in a hierarchy of families and lines with certain genetic relationships. Genotypic variances were estimated and partitioned into components due to additive, dominance, and additive X additive genetic effects for several traits.

Additive genetic variance was significant for heading date, plant height, percentage groat protein (groat protein), seed yield, and groat weight. Dominance was not significant for any of the traits. Additive x additive genetic variance was significant for groat protein and seed yield. Within several F₂-derived families, large differences in F₆ were shown between F₃-derived families and between F₄ lines within F₂-derived families for groat protein and seed yield. These large differences may be due to cytological abnormalities occurring when A. saliva L. gennplasm is crossed with A. sterilis L. germplasm causing large intact segments of chromosomes to segregate intead of random recombination.

Small but significant correlations of 0.21, 0.15, –0.27, 0.23, 0.10, and –0.34 were shown between heading date and plant height, heading date and groat protein, heading date and groat weight, plant height and groat protein, plant height and groat weight, and seed yield and groat protein, respectively. Several agronomically desirable lines were identified from the population of 424 lines. These lines demonstrated that the negative correlation between seed yield and groat protein can be broken to some degree. Some genes for high groat protein from A. sterilis appear to have been transferred into good yielding, agronomically acceptable lines.

Key Words: Avena • Genetic variance • Cereal protein • Groat Protein

² Former graduate research assistant (presently soft wheat breeder, Pioneer Hybrid International Inc., Tipton, Ind.) and associate professor, Dep. of Agronomy, Purdue Univ., W. Lafayette, Ind.

Received for publication June 5, 1978.

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				S. Zhu, B. G. Rossnagel, and H. F. Kaeppler Genetic Analysis of Quantitative Trait Loci for Groat Protein and Oil Content in Oat Crop Sci., January 1, 2004; 44(1): 254 - 260. [Abstract] [Full Text] [PDF]