The assumption of monogenic control was verified by a linkage search. In screening segregation of Abg
against a series of RAPD markers, we encountered the following cosegregation with the chromosome 10 marker
D03-1200. Two small families: of BC3S3 parentage were pooled with the following totals:
Thus, despite the small population size, cosegregation of Abg with D03-1200 is clearly proved. Such results could
scarcely be obtained if the fruit pigmentation were controlled by more than one gene.
Relationships of Abg with other purple-fruited mutants Af and atv have not been explored except that the
loci of Abg and atv reside on different chromosomes, the latter on 7. Their phenotypes differ in the respects that Af
does not exhibit the aforementioned variegation and tends to intensify in ripe fruits, and that, in contrast to
expression in Abg and Af, atv foliage is also pigmented.
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