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Fig. 8. A putative role for ALE2 in the promotion of protoderm
differentiation. The RLK ALE2 and another RLK, ACR4, might function in a
single or closely overlapping pathway. ALE1, encoding a putative
subtilisin-like serine protease, is predominantly expressed in the endosperm
that surrounds the developing embryo
(Tanaka et al., 2001) and
functions to promote the formation of the protoderm in a manner independent of
ALE2 and ACR4. The two pathways involving ALE2, ACR4 and ALE1 might act
positively to regulate the specification of the protoderm and/or expression of
protoderm-specific genes in an organized manner. The expression of
protoderm-specific genes, including those for the ATML1 homeodomain protein
and for the redundant factor PDF2, might promote the expression of these genes
themselves and other protoderm-specific genes
(Abe et al., 2001;
Abe et al., 2003).
Subsequently, expression of the FDH gene for a putative fatty-acid
elongase (Yephremov et al.,
1999; Pruitt et al.,
2000) and of other protoderm-specific genes promotes the formation
of the epidermis proper.
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