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Effects of Genotype and Heterozygosity of Pollen Source and Method of Application of Pollen on Seed Set and Seed and Fiber Development in Cotton¹

This paper reports results of a factorial experiment involving four methods of pollen application, four genotypes, and five levels of heterozygosity of pollen source from Upland cotton, Gossypium hirsutum L. Pollen was applied to a common female parent. Data obtained were seed number per boll, seed number per locule, seed index, lint index, grams of lint per boll, and staple length. Different methods of pollination caused varying degrees of physical damage to the young flowers, and this was reflected in all characters measured except staple length. Heterozygosity of the pollen source provided interesting results. Larger seeds developed when flowers of the female parent (F₀¹) were pollinated with pollen of the same source than when pollinated with pollen from F₁ or from genetically different parental sources (F₀²). Seed development (seed index) was less variable with F₀¹ than F₀¹ or F₀² pollen; this indicated greater developmental stability and adaptation of self-fertilization.

Key Words: Upland cotton • Gossypium Hirsutum L., • homeostasis

² Research Geneticist, Crops Research Division, ARS, USDA, College Station, Texas 77843.

Received for publication November 9, 1967.