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VARICOSE, a WD-domain protein, is required for leaf blade development
Authors:Deyholos Michael K  Cavaness G Frank  Hall Branden  King Ed  Punwani Jayson  Van Norman Jaimie  Sieburth Leslie E
Affiliation:Department of Biological Sciences, University of Alberta, Edmonton, Canada.
Abstract: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.
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