|CAULIFLOWER (CAL ) is a flower meristem identity gene and is closely related to APETALA1 (AP1 ), and these two gene products share 76% identical and 88% similar amino acid sequences. cal mutant plants are phenotypically wildtype, whereas mutations in the CAL gene dramatically enhance the phenotype of ap1 mutants, resulting in the massive proliferation of inflorescence-like meristems (the "cauliflower" phenotype).||
|Thus, CAL and AP1 are
closely related MADS-box genes whose activities overlap in the specification of flower
Like AP1 , CAL RNA accumulates in young flower primordia as they arise on the flanks of the inflorescence meristem. Shown below are bright field (left) and bright/dark-field double exposures (right), and the red hybridization signal indicates the accumulation of CAL RNA.
Bowman, J.L., Alvarez, J., Weigel, D., Meyerowitz, E.M., and Smyth, D.R. (1993). Control of flower development in Arabidopsis thaliana by APETALA1 and interacting genes. Development, 119:721-743.
Kempin, S.A., Savidge, B., and Yanofsky, M.F. (1995) Molecular basis of the cauliflower phenotype in Arabidopsis . Science 267:522-525.