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The Journal of Heredity 1985:76(3):202-204
© 1985 The American Genetic Association 76:202-204

research-article

Rust resistance expression in cotyledons, petioles, and stems of Gossypium hirsutum L.

R. G. Percy, and L. S. Bird

Dr. Percy, formerly a graduate student of Dr. Bird, is research scientist, U.S. Department of Agriculture-ARS, University of Arizona Cotton Research Center, 4207 East Broadway, Phoenix, AZ 85040; Dr. Bird is professor in the Department of Plant Sciences, Texas Agricultural Experiment Station, Texas A&M University System, College Station, TX 77843.

Abstract

An Investigation was conducted to determine the manner of resistance expression in the cotyledons, petioles, and stems of Gossypium hirsutum L to the cotton rust pathogen Puccinia cacabata Arth. and Holw. Confirmation was obtained for the single-gene inheritance of cotyledon resistance. The dominant gene for cotyledon resistance was given the gene symbol Pu from the pathogen name. Expression of resistance in petioles and stems was found to be independent of cotyledon resistance. An association of petiole with stem resistance was detected. Tests of phenotypic association of the glandless and nectariless traits with resistance produced no evidence of an association between cotyledon resistance and either morphological trait. Petiole rust resistance expression was associated with both the glandless and the nectarlless tralts.


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