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• 1. [Article] A comparison of three systems of phenotypic selection for grain yield in three spring barley populations

  Concerns regarding the most effective means of evaluating segregating generations of spring barley prompted this investigation. Three methods of selection were considered: bulk, pedigree, and single seed ...

  Citation × Citation Citation Abstract Copy Title: A comparison of three systems of phenotypic selection for grain yield in three spring barley populations Author: Hayes, Patrick M. Concerns regarding the most effective means of evaluating segregating generations of spring barley prompted this investigation. Three methods of selection were considered: bulk, pedigree, and single seed descent. F₆ lines derived by each method were grown in a replicated yield trial. The effectiveness of each method was measured in terms of grain yield and four other agronomic traits. Continuity of method performance was evaluated across three spring barley populations. Parents used in developing these populations were chosen on the basis"of their diverse genetic backgrounds. Experimental populations differed for all agronomic traits measured. Differences between methods of selection were only found for 100 kernel weight, with lines from the single seed descent method being superior. The pedigree method was least effective for this trait. No significant differences between selection methods were found for plant height, spikes per meter, kernels per spike or grain yield. Significant differences were found between individual lines within methods and crosses for all traits except spikes per meter. There was no conclusive superiority of lines derived by any given method for any of the five traits. Although the single seed descent method was not significantly different from the pedigree and bulk methods on a mean basis, it did derive a number of superior individual lines and preserved substantial between-line variability for all traits measured, except spikes per meter. Because of the overall efficiency achieved with the single seed descent method, it may be a useful tool for the breeder of self-pollinated species. Title: A comparison of three systems of phenotypic selection for grain yield in three spring barley populations Author: Hayes, Patrick M. Concerns regarding the most effective means of evaluating segregating generations of spring barley prompted this investigation. Three methods of selection were considered: bulk, pedigree, and single seed descent. F₆ lines derived by each method were grown in a replicated yield trial. The effectiveness of each method was measured in terms of grain yield and four other agronomic traits. Continuity of method performance was evaluated across three spring barley populations. Parents used in developing these populations were chosen on the basis"of their diverse genetic backgrounds. Experimental populations differed for all agronomic traits measured. Differences between methods of selection were only found for 100 kernel weight, with lines from the single seed descent method being superior. The pedigree method was least effective for this trait. No significant differences between selection methods were found for plant height, spikes per meter, kernels per spike or grain yield. Significant differences were found between individual lines within methods and crosses for all traits except spikes per meter. There was no conclusive superiority of lines derived by any given method for any of the five traits. Although the single seed descent method was not significantly different from the pedigree and bulk methods on a mean basis, it did derive a number of superior individual lines and preserved substantial between-line variability for all traits measured, except spikes per meter. Because of the overall efficiency achieved with the single seed descent method, it may be a useful tool for the breeder of self-pollinated species. Close