Abstract
The heritability of flowering was studied in sugarcane (Saccharum spp. L.) by observing the percentage of stools that flowered in 10 vegetatively propagated commercial clones, in 25 F1 populations obtained by crossing five of the clones as females with the other five used as males, and in S1 populations from the five paternal parents. All plants were field grown as spaced stools in a randomized block experiment with six replications. Populations within blocks were represented by 17 spaced stools each. Flowering frequency among parental clones ranged from 3.2% of all stools of CP 63‐588 and CP 70‐300 to 96.9% of all stools of CP 52‐68. Overall, 49% of all parental stools, 35% of all F1 seedlings, and 17% of all S1 seedlings flowered. Estimates of heritability obtained from F1‐ midparent regression were 54 to 60%. General combining ability was more important than specific combining ability in explaining the variance among F1 populations; the variance component for general combining ability was 4.4 times larger than that for specific combining ability.
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