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The Journal of Heredity 1994:85(1):23-29
© 1994 The American Genetic Association 85:23-29

research-article

The Candystrip Locus, y-cs, Determines Mutable Pigmentation of the Sorghum Leaf, Flower, and Pericarp

C. A. Zanta, X. Yang, J. D. Axtell, and J. L. Bennetzen

Department of Biological Sciences, Purdue University West Lafayette, IN 47907
Department of Agronomy, Purdue University West Lafayette, IN 47907

Address reprint requests to Dr. Bennetzen at the address above.

Abstract

Several sorghum [Sorghum bicolor(L.) Moench] lines that exhibit variegated pericarp color have been collected. We selected one of these lines, referred to as candystripe, for genetic characterization. We found that the gene involved in the candystripe phenotype is not only associated with red pigment variegation in the pericarp layer of the seed, but also determines variegated red pigmentation in chlorophyll-bleached leaves and yellow pigmentation in the stigmas of mature flowers. Inheritance tests indicated that the candystripe trait is monogenic, and allelism tests showed that it is encoded by an allele of the sorghum Y locus, which we call y-cs. Segregation studies suggested that y-cs instability is autonomous and without extreme dosage effects. Molecular and mapping data demonstrated that the Y gene of sorghum is not homologous to any of the several(> 12) cloned genes from maize that are known to be involved in flavonoid synthesis. We have observed germinal instability of y-cs; apparent reversion to a stable Y phenotype occurred at frequencies varying from < 1% to > 20%. The behaviors of y-cs are indicative of the type of transposable element-induced systems that, in maize and other plant species, have proved invaluable as tools for molecular, genetic, and developmental studies.


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