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We describe a novel mutant of Arabidopsis, Flo10, which is the result of a recessive allele, flo10, in the nuclear gene FLO10. The first three organ whorls (sepals, petals, and stamens) of Flo10 flowers are normal, but the fourth, gynoecial whorl is replaced by two to eight stamens or stamen-carpel intermediate organs. Studies of ontogeny suggest that the position of the first six of these fourth-whorl organs often resembles that of the wild-type third-whorl organs. To determine the interaction of the FLO10 gene with the floral organ homeotic genes APETALA2 (AP2), PISTILLATA (PI), AP3, and AGAMOUS (AG), we generated lines homozygous for flo10 and heterozygous or homozygous for a recessive allele of the homeotic genes. On the basis of our data, we suggest that FLO10 functions to prevent the expression of the AP3/PI developmental pathway in the gynoecial (fourth) whorl.

The FLO10 Gene Product Regulates the Expression Domain of Homeotic Genes AP3 and PI in Arabidopsis Flowers.