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THE PLANT CELL, Vol 3, Issue 8 749-758, Copyright © 1991 by American Society of Plant Biologists
Expression of the Arabidopsis Floral Homeotic Gene AGAMOUS Is Restricted to Specific Cell Types Late in Flower Development
J. L. Bowman, G. N. Drews and E. M. Meyerowitz
Division of Biology, California Institute of Technology, Pasadena, California 91125
Mutations in the AGAMOUS (AG) gene cause transformations in two adjacent
whorls of the Arabidopsis flower. Petals develop in the third floral whorl
rather than the normal stamens, and the cells that would normally develop
into the fourth whorl gynoecium behave as if they constituted an ag flower
primordium. Early in flower development, AG RNA is evenly distributed
throughout third and fourth whorl organ primordia but is not present in the
organ primordia of whorls one and two. In contrast to the early expression
pattern, later in flower development, AG RNA is restricted to specific cell
types within the stamens and carpels as cellular differentiation occurs in
those organs. Ectopic AG expression patterns in flowers mutant for the
floral homeotic gene APETELA2 (AP2), which regulates early AG expression,
suggest that the late AG expression is not directly dependent on AP2
activity.
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