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The candystripe locus, y-cs, determines mutable pigmentation of the sorghum leaf, flower, and pericarp



The candystripe locus, y-cs, determines mutable pigmentation of the sorghum leaf, flower, and pericarp



Journal of Heredity 85(1): 23-29



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 ( gt 12) clones 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 lt 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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Accession: 002513846

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