SEED DEVELOPMENT IN RELATION TO ANEUPLOIDY IN AUTOTETRAPLOID HORDEUM VULGARE L

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Abstract
The effect of seed selection on incidence of aneuploidy was determined in two generations of autotetraploids derived from hybrids doubled in F1. Selection into 3 classes was based on size and conformation of seed. Root-tip chromosome counts were made on each class in C2 and C3. Over all crosses and generations, the best to the poorest seed classes produced 82.9, 55.1 and 34.7 per cent euploids respectively. The proportion of hyperploids in the best class of seed was substantially greater than in the poorer classes. Seed selection in C2 was effective in altering the proportion of the seed classes and the percentage of euploids produced by the C3 descendant plants. The association of seed classes with per cent euploidy in two generations suggested linkage of genetic factors influencing the two characters.