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Genetic Analysis of a New Virescent Mutant in Cotton¹

A spontaneous mutant in cotton (Gossypium hirsutum L.) is described, and the results of its genetic analysis are reported. This mutant was called virescent-splash-leaf because it showed a typical virescent expression, and portions of the leaf surface had a splash-leaf appearance resulting from abnormal palisade cell development. Expression of the virescent phenotype was consistent, but the splash-leaf expression was variable. The incidence of the splash-leaf expression was associated with cool temperatures.

The mutant was conditioned by recessive alleles at a single locus. Because it was non-allelic with any known virescent mutants, it was designated as virescent-8 and assigned the gene symbols v₈v₈.

Linkage analysis of virescent-8 did not reveal any significant association with the marker loci: cup leaf, glandless-1, frego bract, cluster-1, virescent-1, Okra leaf, Red plant, Pilose, Petal spot, Yellow petals, Pollen color, Brown lint-1, Naked seed, or Green lint.

Key Words: Linkage • Inheritance • Phenotypic expression • Temperature effect

² Research Geneticist, ARS, USDA, College Station, TX 77843.

Received for publication January 30, 1974.