Abstract
The effect of heterozygosity on the phenotypic stabilities of tiller number, plant height, kernels per spike, kernel weight, grain yield, and awn length was studied in hybrid crosses of six-row barley Hordeurn vulgare L. emend Lam., and two-row barley Hordeum distichum L. emend Lam. Experimental material consisting of parents and their F1diallel progeny were grown at two field locations and one greenhouse location in Oregon. Coefficients of variation were used to measure phenotypic stability within and across the three locations.Some evidence was obtained which indicated that heterozygosity reduced phenotypic stability of particular characters at some locations. Although individual characters were affected within particular locations, heterozygosity per se did not influence average phenotypic stability when the results from three diverse environments were combined.Association studies indicated that the phenotypic stability of kernel weight, plant height, kernels per spike and awn length were associated, which may suggest a common control mechanism in the phenotypic stability of these characters.
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