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Published August 1991 | public
Journal Article

Expression of the Arabidopsis floral homeotic gene AGAMOUS is restricted to specific cell types late in flower development

Abstract

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.

Additional Information

© 1991 American Society of Plant Biologists. Received May 30, 1991; accepted June 24, 1991. We thank the other members of our laboratory and David Smyth for providing materials and advice, and for comments on the manuscript. This work was supported by National Institutes of Health (NIH) Grant GM45697 to E.M.M. G.N.D. was supported by NIH Postdoctoral fellowship GM13100-03, and J.L.B. was partially supported by NIH training Grant 5T32-GM07616.

Additional details

Created:
August 20, 2023
Modified:
October 23, 2023