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The Journal of Heredity 2002:93(1)
© 2002 The American Genetic Association 93:52-55

Brief Communication

Genetics of Qualitative Traits in Domesticated Chia (Salvia hispanica L.)

J. P. Cahill, and M. C. Provance

From the Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA 92521.

Address correspondence to J. P. Cahill at the address above or e-mail: jpca{at}citrus.ucr.edu.

In Salvia hispanica L., several changes in qualitative characters, including seed coat color, stem pigmentation, and shattering, have evolved with cultivation and domestication. Three F2 segregating generations from crosses between wild and domesticated parents were scored for three qualitative traits. A single recessive gene, designated scc, was found to govern the white seed characteristic. A single dominant gene, designated SSP, was found to control striated stem pigmentation. A complete dominance of open calyx over closed calyx was observed in F1 generations and small numbers of plants with closed calyxes were observed in F2 generations, not conforming to Mendelian ratios. For this nonshattering trait, a complementation test was conducted between two lines representative of geographically and morphologically divergent domesticated varieties. Complementary gene action was not observed in any F1 plants, and all F2 plants were homogeneous with respect to the trait, suggesting the same genetic control for nonshattering among domesticated varieties. An analysis of limited data for linkage of SSP and scc indicated that the two loci segregate independently.


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