Abstract
A P32-treated vulgare wheat plant produced an offspring having yellow-green stripes on the leaves. The variegated leaf character is maternally inherited. Progenies of individual variegated selfed plants differ widely in the proportions of green: variegated individuals. Green sibs of variegated plants breed true. In crosses between variegated awn-tipped and green bearded plants, the awn character segregated in a simple Mendelian fashion while the variegation appeared only in individuals whose maternal parent was variegated. Plastid mutation independent of chromosomal genes is presumed to have occurred in the P32-treated parent of the original variegated plant. On the plastid-mutation hypothesis, variegated plants have two kinds of plastids, normal and mutant, and either or both kinds may be represented in the eggs produced. When both kinds of plastids are present, segregation during embryo development may result in the variegated effect seen in the older plants.
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