Abstract
Anthocyanin mosaicism in peach was investigated in the cultivar `Pillar' and its progeny. Reversion of the unstable white flower (w) allele in `Pillar' gave rise to mericlinal chimeras of non-pigmented and pigmented tissues. Self seeds obtained from chimeric shoots with green stems, red sepals, and bright pink flowers produced only anthocyaninless progeny, suggesting reversion in the LI cell layer. Mutant sectors with red stems, green sepals, and pale pink flowers produced about 50% pigmented progeny, suggesting reversion in LII tissue. Mendelian segregation of the revertant phenotype was demonstrated by crossing pollen from revertant red shoots (LII revertants) onto a stable anthocyaninless female of genotype GrGrww. Progeny segregated approximately 1:1 for anthocyanin production (red leaf color) and anthocyanin absence, respectively. Pollen from flowers on green-stemmed sectors produced predominantly anthocyaninless progeny when crossed to GrGrww females. Reversion of the unstable w allele in green-leafed progeny from these crosses was greater in LI than in LII tissue. Genetic evidence supports the contention that anthocyanin instability in `Pillar' is due to transposable element activity.
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