Coleoptile Length and Emergence of Amigo 1AL.1RS Semidwarf Wheats

K. B. Porter


This study compared growth chamber coleoptile length and field emergence of wheat backcross lines, that have the Amigo 1AL.1RS wheat-rye translocation, to those of their recurrent semidwarf cultivar parents. Field emergence from 4, 6 and 8 cm was determined in 1989, 1990 and 1991. Fourteen of 22 backcross lines had significantly longer coleoptiles than their recurrent parent, but those of only one were more than 10% longer. None had shorter coleoptiles. Differences in emergence among genotypes were substantial only in 1990, significant among planting depths in all experiments, but the genotype x planting depth interaction was not significant in all experiments. Differences in coleoptile lengths accounted for no more than 10% of the variation in emergence percentage across all treatments, but in 1990 variation in coleoptile length accounted for 36% of the variation in emergence percentage from the 8 cm depth, 81% of the variation in emergence among genotypes, and 98% of the variation among seed source emergence means. Although generally unrelated, seed weight in 1991 accounted for 64% of the variation in emergence of genotypes from the 8 cm depth. The Amigo 1RS rye segment had a small positive effect or no effect on coleoptile length and seedling emergence.


wheat; coleoptile

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