- Authors:
Jack T. Brockman LL. Meyerowitz EM.
- Title:
The homeotic gene APETALA3 of Arabidopsis thaliana encodes a MADS box and
is expressed in petals and stamens.
- Reference location:
Cell. 68(4):683-97, 1992 Feb 21.
- Abstract:
Mutations in the APETALA3 (AP3) gene of A. thaliana result in homeotic
transformations of petals to sepals and stamens to carpels. We have cloned
the AP3 gene from Arabidopsis based on its homology to the homeotic flower
gene deficiens (DEFA) from the distantly related plant Antirrhinum majus.
The sequence of four ap3 mutant alleles and genetic mapping analysis prove
that the DEFA homolog is AP3. Like several other plant homeotic genes, the
AP3 gene contains a MADS box and likely acts as a transcription factor.
The region-specific spatial expression pattern of AP3 rules out certain
types of sequential models of flower development and argues in favor of a
spatial model based on positional information. Since DEFA and AP3 have
very similar protein products, mutant phenotypes, and spatial expression
patterns, it is likely that these genes are cognate homologs.
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