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Response of Hard Red Spring Wheat (Triticum aestivum L.) to Environments in Relation to Six Quality Characteristics¹

Eight varieties of hard red spring wheat (Triticum aestivum L.) were evaluated by regression analysis for six bread quality characteristics to determine varietal response to environments. Means of all entries in each uniform nursery were used as environmental indexes for each characteristic. The linear regression coefficient allowed a comparison of predicted performance among varieties over a range of environments for each quality character

‘Thatcher’ had the highest response and ‘Polk’ the least response while the six other varieties did not differ in their responses to environments for protein. ‘Manitou,’ ‘Selkirk,’ and Thatcher had high means and an undesirably high response to increasing ash environments. All varieties except ‘Waldron’ and Minn. II-54-30, exhibited a lower response to environments for mixogram score than for the other quality characteristics studied. ‘Chris’ exhibited a high response to increasingly good environments for loaf volume, whereas Selkirk had a below average response and a low mean.

A minimum standard system of using check varieties with known environmental responses to aid in the evaluation of potential varieties for quality characteristics is proposed, based on the varieties' means and responses. Selkirk, Manitou, and Polk would provide the necessary number of checks for the evaluation of the six quality characteristics studied under most environments.

Key Words: Regional nursery • Varietal stability • Protein • Flour ash • Flour yield • Mixogram score • Flour water absorption • Loaf volume

² Assistant Professor, Department of Agronomy; Research Technologist, Crops Research Division, ARS, USDA; and Associate Professor, Department of Agronomy, North Dakota State University, respectively.

Received for publication May 26, 1969.

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