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Straw-protein Percentages in Avena sterilis L.¹

A group of 334 Avena sterilis L. strains was grown at Ames, Iowa, and measured for groat and straw-protein percentages and heading date. F₃ segregates from five crosses between A. sativa x A. sterilis lines were measured for the same traits.

Straw protein for the A. sterilis strains ranged from 5.5 to 14.6%. Three A. sativa lines used as checks had mean percentages from 5.6 to 6.7. Collections from Libya generally had higher levels of straw and groat protein than those from other countries, even though the strain with the highest straw protein, PI 324721, was from Greece.

There was a positive correlation between heading date and straw-protein percentage, but one A. sterilis strain, PI 324774, was early and had 12.1% straw protein. Groat protein and straw protein were uncorrelated for the A. sterilis strains.

The inheritance of straw-protein content probably was due to a small number of segregating effective factor pairs.

Key Words: Inheritance • Groat protein • Oats • Phenotypic correlations • Oat forage

² Curtiss Distinguished Professor of Agriculture, student research assistant, and graduate student (on leave from West. Aust. Dep. of Agric.), respectively.

Received for publication November 8, 1974.