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Normal vs. Okra Leaf Yield Interactions in Cotton. II. Analysis of Vegetative and Reproductive Growth¹

Past studies on differences in growth between Okra(L₂°,L₂°) and normal (broad-leaved l₂l₂) cottons (Gossypium hirsutum L.) have routinely used Okra lines derived from backcrossing the Okra leaf trait into established cultivars. In the current study, we compared plant growth and fiber yield among near-isogenic lines of Okra and normal selected from bulked heterozygous populations derived from two sets of contrasting crosses. Four paired near-isogenic Okra leaf and normal leaf lines were planted in replicated trials on two planting dates in 1983 at Stoneville, MS Two strains had superior lint yield by the normal leaf sib while two others had superior lint yield by the Okras sib. ‘Stoneville 213’( STV 213), the Okra leaf cultivar produced by conventional backcrossing, served as the control wherein the normal leaf has been superior in yield compared to the Okra leaf. Except for plant height, the parameters of vegetative and reproductive growth showed no significant leaf type x strain, or leaf type x strain x harvest date interactions. The Okra leaf entries produced maximal leaf area indices that were 26 and 49% smaller than those produced by the normal leaf entries for the April and May plantings, respectively. This disparity was partially offset by the production of more leaves by the Okra entries in the early planting, but not in the late planting. the number of squares and flowers produced by the Okra leaf entries indicates a greater fruiting potential than was realized. The percentage of bolls that was shed was closely associated with the maximal number of immature bolls produced. We concluded that the Okra leaf cottons can produce plant canopies competitive in yield with those of broad-leaved cottons. The maximum potential of cottons with Okra leaves remains unclear, because of the large leaf type x environment interactions.

Key Words: Gossypium hirsutum L. • Vegetative growth • Reproductive growth • Yield components • light penetration • Leaf area • Genotype x environment interaction

² Plant physiologist and research geneticist, respectively, USDA-ARS, Cotton Physiology and Genetics Res. Unit, Jamie Whitten Delta States Res. Ctr., Stoneville, MS.

Received for publication February 11, 1985.

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