Inbreeding Depression of Selected F3 Cotton Progenies1
- William R. Meredith2
The objective of this study was to investigate yield inbreeding depression of selected cottons (Gossypium hitsutum L.). In 1973, 360 F3 equivalent progeny rows from the cross and random intercross of ‘Deltapine 16’ ✕ ‘Mo 277-396’ were grown at two Delta locations with two replications each. From 50 of the 72 highest lint-producing progenies, F4 and F5 seed were produced in 1973 and 1974.
In 1975, the 50 families were grown in five sets of 10 families each at two locations. Families were grown as whole plots; F3, F4, and F5 progenies were grown as subplots. An additional whole plot of Deltapine 16, Mo 277-396, F1 F2, and the unsefected bulk of F3, F4 and F5 plants was grown in each set. The average lint yields of these seven populations were 633, 899, 859, 751, 725, 709, and 713 kg/ha, respectively. The average yields of selected F3, F4, and F5 progeny were 759, 748, and 710 kg/ha, respectively. Significant inbreeding depression was detected in both selected and unselected populations. These results imply that inbreeding depression is a major factor in the poor yield performance of early generation selections for yield in cotton.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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