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DEVELOPMENT AND HORMONE ACTION

DRP1A Is Responsible for Vascular Continuity Synergistically Working with VAN3 in Arabidopsis¹

Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo 7–3–1, Bunkyo-ku, Tokyo 113–0033, Japan (S.S., K.K., S.N., T.U., A.N., H.F.); Molecular Membrane Biology Laboratory, RIKEN, Wako 351–0198, Japan (A.N.); and Plant Science Center, RIKEN, Yokohama 230–0045, Japan (T.D., H.F.)

In most dicotyledonous plants, vascular tissues in the leaf have a reticulate venation pattern. We have isolated and characterized an Arabidopsis (Arabidopsis thaliana) mutant defective in the vascular network defective mutant, van3. van3 mutants show a discontinuous vascular pattern, and VAN3 is known to encode an ADP-ribosylation-factor-GTPase-activating protein that regulates membrane trafficking in the trans-Golgi network. To elucidate the molecular nature controlling the vein patterning process through membrane trafficking, we searched VAN3-interacting proteins using a yeast (Saccharomyces cerevisiae) two hybrid system. As a result, we isolated the plant Dynamin-Related Protein 1A (DRP1A) as a VAN3 interacting protein. The spatial and temporal expression patterns of DRP1A::GUS and VAN3::GUS were very similar. The subcellular localization of VAN3 completely overlapped to that of DRP1A. drp1a showed a disconnected vascular network, and the drp1a mutation enhanced the phenotype of vascular discontinuity of the van3 mutant in the drp1a van3 double mutant. Furthermore, the drp1 mutation enhanced the discontinuous vascular pattern of the gnom mutant, which had the same effect as that of the van3 mutation. These results indicate that DRP1 modulates the VAN3 function in vesicle budding from the trans-Golgi network, which regulates vascular formation in Arabidopsis.

² Present address: Department of Botany, University of Toronto, 25 Willcocks Street, Toronto ON, M5S 3B2, Canada.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.105.061689.

^* Corresponding author; e-mail sawa{at}biol.s.u-tokyo.ac.jp; fax 81–3–5841–4462.

Received February 20, 2005; returned for revision April 4, 2005; accepted April 20, 2005.

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