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First published online December 1, 2003
doi: 10.1242/10.1242/dev.00909
1 Department of Biology, University of Utah, Salt Lake City, Utah, 84112,
USA
2 Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada
T6G 2E9
* Author for correspondence (e-mail: sieburth{at}biology.utah.edu)
Accepted 10 September 2003
To gain insight into the processes controlling leaf development, we characterized an Arabidopsis mutant, varicose (vcs), with leaf and shoot apical meristem defects. The vcs phenotype is temperature dependent; low temperature growth largely suppressed defects, whereas high growth temperatures resulted in severe leaf and meristem defects. VCS encodes a putative WD-domain containing protein, suggesting a function involving protein-protein interactions. Temperature shift experiments indicated that VCS is required throughout leaf development, but normal secondary vein patterning required low temperature early in leaf development. The low-temperature vcs phenotype is enhanced in axr1-3 vcs double mutants and in vcs mutants grown in the presence of polar auxin transport inhibitors, however, vcs has apparently normal auxin responses. Taken together, these observations suggest a role for VCS in leaf blade formation.
Key words: Leaf Development, Vein Pattern, WD domain, Meristem, Arabidopsis thaliana
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