Growth Analysis of American Upland Cotton, Gossypim hirsutum L., with Different Leaf Shapes and Colors
1972
Karami, E. | Weaver, Judith B.
Analysis of plant growth and development of biotypes of American Upland cotton (Gossypium hirsutum L.) with nine different combinations of leaf shape and color were made at two plant populations. The nine combinations of leaf shape and color were obtained by crossing Okra Leaf ‘Stoneville 7A’ BC₄ with Red Leaf Stoneville 7A BC₄ and then selecting the various leaf shapes and color combinations within the F₂ population. Okra Leaf (L° L°) was associated with low incidence of boll rot, number of vegetative branches, node number of first-fruiting branch, dry weight of vegetative parts, leaf area, and with a shorter plant compared with normal leaf type. Okra Leaf also resulted in earlier maturity, higher harvest index, and higher seed cotton yield compared with normal leaf cotton. Okra Leaf had no effect on fiber length or fiber length uniformity, but caused a slight reduction in fineness and a slight increase in fiber strength. The homozygous red color resulted in a significant reduction in seed cotton yield in an experiment with 45-cm spacing within the row. There were no significant interactions between leaf shape and leaf color. All measurements for intermediate (heterozygous) leaf shape were between the values found for Okra Leaf and normal leaf cotton.
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