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Protein Composition in Developing Groats of an Avena sativa. L. Cultivar and an A. sativa x Avena sterilis L. Selection¹

‘Noble’, CI9194, an Avena sativa L. cultivar with a medium percentage of groat protein, and Purdue 65256C4-38, a selection from a cross of A. sativa x Avena sterilis L. with a high percentage of groat protein, were grown in the field in 1972 and 1973 at Lafayette, Ind. Primary groats in the top half of panicles were harvested at 2 or 3-day intervals from anthesis until several days after maturity. Groat dry weight, percentage of protein, and protein solubility fractions were measured.

Increase in dry weight ceased at about 22 days after flowering, whereas percentage of protein increased slightly until about 28 days after flowering. The high-protein cultivar maintained a higher level of protein throughout groat development. Globulins and glutelins comprised the major portion of protein in both cultivars, but levels of these two fractions were higher in the highprotein cultivar. Albumins and prolamins increased during maturation of the groats, but at maturity, each comprised less than 20% of the total protein.

Key Words: Oats • Albumins • Globulins • Glutelins • Prolamins • Dry matter

² Assistant professor of agronomy, Purdue Univ.; and plant physiologist, ARS-USDA, and assistant professor of agronomy, Univ. of Wisconsin.