Abstract
Class B Gene Expression and the Modified ABC Model in Nongrass Monocots
Highlights
Flower development in plants can be subdivided into several major steps, including floral induction, floral meristem formation, and floral organ development
In addition to being expressed in monocots, the AP3 and PI class B gene homologues are expressed in petaloid sepals in the first whorl in two dicots, Aquilegia alpina and A. clematiflora of Ranunculaceae[31]
The expansion of class B gene expression into the first whorl is consistent with the floral morphology of these species
Summary
Flower development in plants can be subdivided into several major steps, including floral induction, floral meristem formation, and floral organ development. A Northern blot analysis of dissected floral organs showed that the LRDEF gene is expressed in outer and inner tepals and stamens This expression pattern, like that of tulip, supports the modified ABC model [1]. This is the first report to support the modified ABC model and to show that the class B genes are expressed in the floral organ primordia of the two outer whorls Muscari armeniacum, another member of Asparagales, has two whorls of petaloid tepals fused into a tube (Fig. 1A, panel d). An RT-PCR analysis detected the transcripts of both of these genes in all floral organs This result of expanded class B gene expression in whorl 1 is similar to that found in M. armeniacum, supporting the modified ABC model. There are some interesting results in monocot species that are not easy to explain
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