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The Journal of Heredity 1986:77(5):364-366
© 1986 The American Genetic Association 77:364-366

other

Round leaf-3 mutant in American Pima cotton

E. L. Turcotte

The author is research geneticist, USDA-ARS. University of Arizona Cotton Research Center, Phoenix, AZ 85040. Contribution from USDA-ARS and the Arizona Agricultural Experiment Station Journal paper no. 4065.

Abstract

Aberrant cotton (Gossypium sp.) plants are a source of qualitative mutant genes that are useful as genetic markers and aid in the study of genetic systems in cotton. A plant with abnormal leaves was found in the allotetraploid American Pima cotton cultivar Pima S-3, G. barbadense L., and subsequent genetic analyses showed that the aberrant phenotype was inherited as an incomplete dominant trait. Heterozygous plants express several characteristics including small, yellow-green, waxy leaves that are often rounded, have modified narrow bracts, and normal branches arising from low main-stem nodes. Homozygous dominant plants express an extreme phenotype, and they rarely flower or shed pollen making them functionally lethal. Allelism tests between Round leaf-2, described in G. hirsutum, and the mutant described here were negative; however, they may be homoeoalleles. The name Round leaf-3 and the gene symbol Rl3 is proposed for the American Pima mutant. Linkage tests between Rl3 and 23 other Gossypium mutant genes were negative.


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