Abstract
Summary: The ASYMMETRIC LEAVES1(AS1)and ASYMMETRIC LEAVES2(AS2)genes of Arabidopsis thaliana are involved in the establishment of the leaf venation system, which includes the prominent midvein; as well as in the development of a symmetric flat lamina. Both AS1 and AS2 genes are involved in repression of class1 knox homeobox genes in leaves. We have characterized the AS2 gene, which appears to encode a novel protein with cysteine repeats(Cmotif), a conserved glycine residue, and a leucine-zipper-like sequence in the amino-terminal half of the primary sequence. The AS2 protein belongs to a novel family of proteins that we have designated the AS2 family. Overexpression of AS2 cDNA in transgenic Arabidopsis plants resulted in upwardly curled leaves, which differed markedly from the downwardly curled leaves generated by loss-of-function mutation of AS2. Our results further suggest that AS2 functions to regulate the formation of a flat leaf lamina in the presence of the AS1 gene.
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