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THE PLANT CELL, Vol 3, Issue 11 1221-1237, Copyright © 1991 by American Society of Plant Biologists
The FLO10 Gene Product Regulates the Expression Domain of Homeotic Genes AP3 and PI in Arabidopsis Flowers
E. A. Schultz, F. B. Pickett and G. W. Haughn
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0, Canada
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.
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