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AGAMOUS (AG) is a C-function floral organ identity gene, and is responsible for formation of stamens and carpels in the third and fourth whorls of the wild type flower. In addition, AG is required for meristem determinacy such that ag mutant flowers are indeterminate and produce an essentially endless number of floral whorls, repeating the basic pattern: (sepal, petal, petal)n. AG RNA begins to accumulate in stage 3 flowers in cells that will later give rise to stamens and carpels.


Gene Sequence

Map position

AG_early_bf.gif (24500 bytes)AG_early_df.gif (28342 bytes)

Later in flower development, AG RNA continues to develop in stamens and carpels but becomes restricted to specific cell types

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Selected References:

Bowman, J.L., Smyth, D.R., and Meyerowitz, E.M. (1991). Genetic interactions among floral homeotic genes of Arabidopsis. Development 112, 1-20.

Bowman, J.L, Drews, G.N., and Meyerowitz, E.M. (1991). Expression of the Arabidopsis floral homeotic gene AGAMOUS is restricted to specific cell types late in flower development. Plant Cell 3:749-758.

Drews, G.N., Bowman, J.L., and Meyerowitz, E.M. (1991). Negative regulation of the Arabidopsis homeotic gene AGAMOUS by the APETALA2 product. Cell 65, 991-1002.

Yanofsky, M.F., Ma, H., Bowman, J.L., Drews, G., Feldmann, K. and Meyerowitz, E.M. (1990). The protein encoded by the Arabidopsis homeotic gene AGAMOUS resembles transcription factors. Nature 346, 35-39.