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, 83 (5), 735-42

The BELL1 Gene Encodes a Homeodomain Protein Involved in Pattern Formation in the Arabidopsis Ovule Primordium

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The BELL1 Gene Encodes a Homeodomain Protein Involved in Pattern Formation in the Arabidopsis Ovule Primordium

L Reiser et al. Cell.

Abstract

Ovule development in Arabidopsis involves the formation of three morphologically defined proximal-distal pattern elements. Integuments arise from the central pattern element. Analysis of Bell 1 (Bel 1) mutant ovules indicated that BEL1 was required for integument development. Cloning of the BEL1 locus reveals that it encodes a homeodomain transcription factor. Prior to integument initiation, BEL1 RNA localizes to the central domain, providing molecular evidence for a central pattern element. Therefore, proximal-distal patterning of the ovule involves the regulated expression of the BEL1 gene that controls integument morphogenesis. A model for BEL1 function is evaluated with regard to new data showing the expression pattern of the floral homeotic gene AGAMOUS (AG) early in wild-type and BEL1 ovule development.

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