ALEURONE COLOR AND QUANTITATIVE GENETIC VARIABILITY IN ISOGENIC LINES OF BARLEY

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Abstract
Isogenic lines of ''Atlas'' barley with blue and white aleurone color in the seed and 4 different types of lemma awn development were evaluated for 8 quantitative characters. Differences among the 8 genotypes were found for each character. The genotypic difference''s were mainly due to the 2 awn length loci (A and B) and their associated linkage blocks. The additive x additive interaction for A and B was significant in 75% of the cases studied, but interactions involving the aleurone color locus (W) were significant in only 12% of the cases. The amount of genetic variability associated with the aleurone color locus and its linkage block is apparently smaller than that contributed by other loci that have been studied in the "Atlas" background. Since there were few significant associations of yield and other agronomically important traits with the aleurone color locus, this character may be disregarded or used as a varietal marker in breeding without affecting progress from selection.