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Agronomic 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).

The presence of the short arm of rye (Secule cereale L.) chromosome one (1RS) has been associated with an increase in grain yield in hard red winter wheat (Triticum aestivum L.). This positive effect has been demonstrated when the 1RS arm is present in the 1BL.lRS translocation. However, little information is available regarding the 1AL.lRS translocation. Our objective was to determine the effect of the 1AL.lRS translocation on yield and yield components and their stability across environments. Eighteen homogeneous 1A lines (non-1RS) and 16 1AL.lRS lines were randomly derived from the heterogeneous cultivar Nekota. These 34 lines, four composites (lA, lAL.lRS, 1AL.lRS + lA, and Nekota), along with six check cultivars were grown in eight Nebraska environments. The 1AL.lRS translocation in the Nekota background increased kernel weight (3.3%) and grain volume weight (0.4%); had no effect on grain yield, kernels per spike, and anthesis date; and decreased plant height (1.2%) and number of spikes per square meter (2.9%). The 1A lines and 1AL.lRS lines were equally stable for grain yield, kernels per spike, spikes per square meter, and plant height. For kernel weight, the 1A lines were more responsive and tended to have heavier kernels under favorable environments, while the 1AL.lRS lines had heavier kernels under lower yielding environments. For grain volume weight, the 1A lines were more responsive than the 1AL.lRS lines, which had heavier grain volume weight under lower yielding environments. Hence, the 1AL.lRS translocation in Nekota was not beneficial for either agronomic performance or stability.

Received for publication January 19, 1998.

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