Journal
DEVELOPMENT
Volume 135, Issue 20, Pages 3345-3354Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/dev.021071
Keywords
PGP; PIN; auxin transport; embryogenesis; organogenesis; tropisms
Categories
Funding
- Volkswagenstiftung
- FWO
- EMBO Young Investigator Programme
- Deutsche Forschung Gemeinschaft (DFG)
- DAAD
- Margarete von Wrangell-Habilitationsprogramm
- Ministry of Education, Youth and Sports of the Czech Republic [LC06034]
- Academy of Sciences of the Czech Republic [KJB600380604]
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The signalling molecule auxin controls plant morphogenesis via its activity gradients, which are produced by intercellular auxin transport. Cellular auxin efflux is the rate-limiting step in this process and depends on PIN and phosphoglycoprotein (PGP) auxin transporters. Mutual roles for these proteins in auxin transport are unclear, as is the significance of their interactions for plant development. Here, we have analysed the importance of the functional interaction between PIN- and PGP-dependent auxin transport in development. We show by analysis of inducible overexpression lines that PINs and PGPs define distinct auxin transport mechanisms: both mediate auxin efflux but they play diverse developmental roles. Components of both systems are expressed during embryogenesis, organogenesis and tropisms, and they interact genetically in both synergistic and antagonistic fashions. A concerted action of PIN- and PGP-dependent efflux systems is required for asymmetric auxin distribution during these processes. We propose a model in which PGP-mediated efflux controls auxin levels in auxin channel-forming cells and, thus, auxin availability for PIN- dependent vectorial auxin movement.
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