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In higher eudicot, the floral organs consist of four different whorls, containing sepals, petals, stamens and carpels. In contrast, the perianths of many monocotyledonous plants, like Liliaceae plants, have almost identical petaloid organs called tepals. The modified ABC model explains this flower morphology; class B genes are expressed in whorl 1 as well as whorls 2 and 3, resulting that the two...
The morphological transition of the first whorl of tepals into sepals occurs frequently during the diversification of angiosperms. Such transitions may play important roles in pollination modes. The B class genes, APETALA3 (AP3) and PISTILLATA (PI) in Arabidopsis thaliana and GLOBOSA (GLO) and DEFICIENS (DEF) in Antirrhinum majus, are required for the development of petals in the second whorl, and...
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