Journal Article

Gibberellins accumulate in the elongating endodermal cells of Arabidopsis root

Kaiserli, Eirini, Castillejo, Cristina, Tsien, Roger Y., Chory, Joanne, Weinstein, Roy, Zhang, Yi, Shani, Eilon, Estelle, Mark

2013

Overview

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.

• Publisher: National Academy of Sciences,National Acad Sciences
• Subject: animals / Arabidopsis - cytology / Arabidopsis - physiology / Arabidopsis thaliana / auxins / Biological Sciences / Biological Transport, Active - physiology / Biosynthesis / Cell growth / Cells / Endodermis / Fluorescence / gibberellic acid / Gibberellins / Gibberellins - metabolism / growth and development / Hormonal regulation / Hormones / Indoleacetic Acids - metabolism / Molecules / mutants / Plant growth / Plant growth regulators / Plant roots / Plant Roots - cytology / Plant Roots - metabolism / Plants / plants (botany) / Root growth / roots / Spatial distribution