title: Gibberellins accumulate in the elongating endodermal cells of Arabidopsis root.
abstract: Plant hormones are small-molecule signaling compounds that are collectively involved in all aspects of plant growth and development. Unlike animals, plants actively regulate the spatial distribution of several of their hormones. For example, auxin transport results in the formation of auxin maxima that have a key role in developmental patterning. However, the spatial distribution of the other plant hormones, including gibberellic acid (GA), is largely unknown. To address this, we generated two bioactive fluorescent GA compounds and studied their distribution in Arabidopsis thaliana roots. The labeled GAs specifically accumulated in the endodermal cells of the root elongation zone. Pharmacological studies, along with examination of mutants affected in endodermal specification, indicate that GA accumulation is an active and highly regulated process. Our results strongly suggest the presence of an active GA transport mechanism that would represent an additional level of GA regulation.
authors: Section of Cell and Developmental Biology, University of California at San Diego, La Jolla, CA 92093, USA.
authors: Eilon
authors: E
authors: Shani
authors: Roy
authors: R
authors: Weinstain
authors: Yi
authors: Y
authors: Zhang
authors: Cristina
authors: C
authors: Castillejo
authors: Eirini
authors: E
authors: Kaiserli
authors: Joanne
authors: J
authors: Chory
authors: Roger Y
authors: RY
authors: Tsien
authors: Mark
authors: M
authors: Estelle
mesh_terms: D017360:Arabidopsis / Q000166:cytology / Q000502:physiology*; D001693:Biological Transport, Active / Q000502:physiology; D005875:Gibberellins / Q000378:metabolism*; D007210:Indoleacetic Acids / Q000378:metabolism; D018517:Plant Roots / Q000166:cytology / Q000378:metabolism*
chemical_list: D005875:Gibberellins; D007210:Indoleacetic Acids
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