The CAPRICE-LIKE MYB gene family cooperatively controls trichome branching and clustering in Arabidopsis

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The CAPRICE-LIKE MYB gene family, including CAPRICE (CPC), TRIPTYCHON (TRY), ENHANCER OF TRY AND CPC1 and 2 (ETC1 and ETC2), CPC-LIKE MYB3/ENHANCER OF TRY AND CPC3 (CPL3/ETC3), encodes a small protein with an R3-type MYB motif that regulates leaf trichome differentiation in Arabidopsis thaliana. To understand the role of CPC-LIKE MYB genes in trichome development, we focused on the effect of these genes on trichome branching and clustering. Trichomes of the try etc1 double mutant consistently had more branches than wild-type and the try single mutant, suggesting that the TRY and ETC1 genes cooperatively regulate trichome branch development. The ETC2 gene has little to no involvement in trichome branching. TRY and CPC are known to have strong effects on trichome cluster formation. Double and triple mutant analyses revealed that the ETC1, ETC2 and CPL3 genes have some degree of functional redundancy with TRY in trichome cluster formation.
2012-09-25