End-use quality performance and stability of 1A vs. 1AL.1RS genotypes derived from winter wheat 'Nekota'

Chromosomal translocations between wheat (Triticum aestivum L.) and rye (Se cale cereale L.) have been associated with an increase in grain yield and a decrease in end-use quality in hard red winter wheat. Although demonstrate d with a 1BL.1RS translocation, less information is available regarding the effect of 1BL.1RS translocations. The objective of this study was to deter mine the effect of a 1AL.1RS translocation in hard red winter wheat on end- use quality traits and their stability across environments. From the hetero geneous 1AL.1RS wheat cultivar Nekota, 18 homogeneous 1A lines (non-1RS), 1 6 1AL.1RS lines, four composites (1A, 1AL.1RS, 1AL.1RS+ 1A, and Nekota), an d six cultivars were tested in eight Nebraska environments. The 1AL.1RS tra nslocation increased flour protein content (5.5 mg g(-1)), but decreased fl our yield (14.2 g kg(-1)), Mixograph mixing time (from 2.9-2.7 min), and Mi xograph mixing tolerance rating (from 3.5-3.1). Despite higher pour protein content in 1AL.1RS lines, the 1AL.1RS translocation did not enhance other end-use quality traits. On the basis of linear regression, the 1A and 1AL.1 RS lines had similar stability values for flour yield and flour protein con tent. The 1A lines showed higher flour yield in all environments, while the 1AL.1RS lines had higher pour protein content in all environments. For Mix ograph mixing time and mixing tolerance, the 1A lines were more responsive to the environment, while the 1AL.1RS lines had exceptional stability over all environments. The end-use quality of Nekota can be explained by a mixtu re of 1A lines with acceptable to good quality and 1AL.1RS lines with poor to acceptable quality.