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Heterosis and Inbreeding Depression in Diploid and Tetraploid Cottons¹

Heterosis was found in both the diploid and tetraploid species of cotton. Of the traits studied, heterosis was most pronounced in yield in both species. The degrees of heterosis shown by G. arboreum were similar to those reported for self-pollinated diploid species. The G. hirsutum hybrid combinations exhibited less heterosis than the G. arboreum hybrids and were less sensitive to inbreeding. These results indicate that the tetraploid species may carry an accumulation of favorable dominant growth genes in duplicate, a factor which results in a type of built-in heterosis.

² Formerly Graduate Assistant (now Research Agronomist, Crops Research Division, ARS, USDA) and Associate Professor of Agronomy, Oklahoma State University.

Received for publication November 29, 1965.

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