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A myb gene required for leaf trichome differentiation in Arabidopsis is expressed in stipules
November 1991
November 1991
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Abstract
The GL1 gene is required for the initiation of differentiation of hair cells (trichomes)
on the crucifer, Arabidopsis thaliana. This gene has been localized to a 4.5 kb DNA
fragment by molecular complementation of gl1 mutants. DNA sequence analysis has shown
that the protein encoded by GL1 contains a Myb DNA-binding motif. Southern analysis
and subsequence analysis of isolated lambda clones has established that GL1 is a member
of an extensive myb gene family in Arabidopsis. The putative GL1 promoter directs
the expression of the GUS reporter gene in non-trichome-bearing structures that appear
to be stipules. This pattern of expression suggests that GL1 may control the synthesis
of a diffusible signal that activates the developmental pathway for trichome differentiation.