Genetic interactions underlying flower color patterns in Antirrhinum majus - PubMed (original) (raw)

. 1989 Nov;3(11):1758-67.

doi: 10.1101/gad.3.11.1758.

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• PMID: 2558047
• DOI: 10.1101/gad.3.11.1758

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Genetic interactions underlying flower color patterns in Antirrhinum majus

J Almeida et al. Genes Dev. 1989 Nov.

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Abstract

Diverse spatial patterns of flower color in Antirrhinum can be produced by a series of alleles of pallida, a gene encoding an enzyme required for pigment biosynthesis. The alleles arose by imprecise excision of a transposable element, Tam3, and we show that they carry a series of deletions involving progressive removal of sequences adjacent to the excision site. This has enabled us to define three cis-acting upstream regions, A, B, and C, which differentially affect the level of pallida expression in distinct areas of the flower. We show further that an unlinked locus, delila, regulates the spatial distribution of pallida transcript. Deletion of regions ABC at the pallida locus uncouples pallida from regulation by delila, whereas deletion of A or AB brings pallida under regulation by delila in a new area of the flower. These results suggest that diverse patterns of pallida expression reflect the different ways in which alleles interact with a prepattern of both common and spatially specific genetic signals in the flower.

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