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THE PLANT CELL, Vol 3, Issue 12 1327-1336, Copyright © 1991 by American Society of Plant Biologists
Allelic Interactions at the nivea Locus of Antirrhinum
J. Bollmann, R. Carpenter and E. S. Coen
John Innes Institute, John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom
Most null alleles at the nivea (niv) locus are recessive to Niv+ and, when
homozygous, give white flowers rather than the red of the wild type. In
contrast, the niv-571 allele is semidominant; although it gives white
flowers when homozygous, very pale flowers result when this allele is
heterozygous with Niv+. We showed that in heterozygotes, niv-571 acts in
trans to inhibit expression of its Niv+ homolog 25-fold to 50-fold. The
inhibition is reversible after meiosis and partially reversible
somatically. The niv-571 allele carries a transposable element Tam3
insertion and three truncated copies of the niv gene, one copy being in
inverse orientation. Analysis of two further niv alleles, niv-572 and
niv-527, showed that excision of Tam3 from niv-571 does not affect the
ability of the allele to repress Niv+ and that one truncated niv copy alone
is insufficient to confer semidominance. The detailed structures of various
semidominant niv alleles suggest that their effects in trans are not
readily explained by production of antisense RNA but are more easily
reconciled with a direct recognition/interaction between homologous genes,
reminiscent of cosuppression and transvection phenomena described in other
systems.
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