Abstract
Summary Different interpretations of the flower of the Brassicaceae exist, suggesting the presence of either 4, 5 or 6 whorls of floral organs. In these models, the 2 short and 4 long stamens account for either 1or 2 whorls, as do the lateral and median sepals. We have searched for inside-whorl differences in gene expression in the Brassicaceae through 2D-PAGE analysis of the total protein pattern of short and long stamens, as well as lateral and median sepals, in Sinapis alba . No detected polypeptide is specific to one type of stamen, none is specific to one type of sepal. On the other hand, about 10% of the polypeptides are specific of one stage of development when long stamens from 4-mm flower buds are compared with long stamens sampled at anthesis. These results suggest that at the molecular level only 4 whorls are detectable and that subtle quantitative variations may account for inside-whorl differences in morphology.
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