'R-Mosaic'

We have reported previously (MNL 56:160) that certain R-g alleles, in the presence of a3, demonstrate a range of unstable plant color phenotypes including a diffuse purple and various grades of red and green variegation. Such variegations can be expressed in the pericarp as well as in leaves, tassels, culms, etc., but the pericarp patterns are not that obvious against the dark aleurone pigment. Incorporating c into these stocks produces a colorless aleurone but still allows full expression of the pericarp pigment. The patterns of sectoring in the pericarp, mimic the sometimes uniform, sometimes irregular patterns that are typical of P-mosaic. Only the pigment differs.

E.D. Styles

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