title: Auxin transport during root gravitropism: transporters and techniques.
abstract: Root gravitropism is a complex, plant-specific process allowing roots to grow downward into the soil. Polar auxin transport and redistribution are essential for root gravitropism. Here we summarise our current understanding of underlying molecular mechanisms and involved transporters that establish, maintain and redirect intercellular auxin gradients as the driving force for root gravitropism. We evaluate the genetic, biochemical and cell biological approaches presently used for the analysis of auxin redistribution and the quantification of auxin fluxes. Finally, we also discuss new tools that provide a higher spatial or temporal resolution and our technical needs for future gravitropism studies.
authors: Department of Biology - Plant Biology, University of Fribourg, Fribourg, Switzerland.
authors: M
authors: M
authors: Geisler
authors: B
authors: B
authors: Wang
authors: J
authors: J
authors: Zhu
mesh_terms: D001692:Biological Transport; D018522:Gravitropism / Q000502:physiology*; D007210:Indoleacetic Acids / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000378:metabolism*; D010827:Physiology / Q000379:methods*; D018517:Plant Roots / Q000502:physiology*
chemical_list: D007210:Indoleacetic Acids; D026901:Membrane Transport Proteins
keywords: ABC transporters; Cholodny-Went hypothesis; IAA; PIN proteins; chemiosmotic model; gravity sensing