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End-Use Quality Performance and Stability of 1A vs. 1AL.1RS Genotypes Derived from Winter Wheat ‘Nekota’

Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583-0915
USDA-ARS and Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583-0915
HybriTech Seed International, Boise ID. 83713

^* Corresponding author(pbaenziger1{at}unl.edu).

Chromosomal translocations between wheat (Triticum aestivum L.) and rye (Secule cereale L.) have been associated with an increase in grain yield and a decrease in end-use quality in hard red winter wheat. Although demonstrated with a 1BL.lRS translocation, less information is available regarding the effect of 1AL.lRS translocations. The objective of this study was to determine the effect of a 1AL.lRS translocation in hard red winter wheat on end-use quality traits and their stability across environments. From the heterogeneous 1AL.lRS wheat cultivar Nekota, 18 homogeneous 1A lines (non-lRS), 16 1AL.lRS lines, four composites (lA, lAL.lRS, lAL.lRS+ lA, and Nekota), and six cultivars were tested in eight Nebraska environments. The 1AL.lRS translocation increased flour protein content (5.5 mg g–¹), but decreased flour yield (14.2g kg–¹), Mixograph mixing time (from 23–2.7 min), and Mixogaph mixing tolerance rating (from 3.5–3.1). Despite higher flour protein content in 1AL.lRS lines, the 1AL.lRS translocation did not enhance other end-use quality traits. On the basis of linear regression, the 1A and 1AL.lRS lines had similar stability values for flour yield and flour protein content. The 1A lines showed higher flour yield in all environments, while the 1AL.lRS lines had higher flour protein content in all environments. For Mixograph mixing time and mixing tolerance, the 1A lines were more responsive to the environment, while the 1AL.lRS lines had exceptional stability over all environments. The end-use quality of Nekota can be explained by a mixture of 1A lines with acceptable to good quality and 1AL.lRS lines with poor to acceptable quality.

Received for publication January 19, 1998.

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