Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue 12, Pages 4834-4839Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1300436110
Keywords
root development; ethylene; root growth; fluorescent labeling; hormone labeling
Categories
Funding
- Vaadia-BARD Postdoctoral Fellowship [FI-431-10]
- Machiah Foundation/Jewish Community Federation Fellowship
- R25T CRIN Training Grant [5R25CA153915-03]
- Marc and Eva Stern Foundation
- Human Frontier Science Program (HFSP) Fellowship [LT000159/2009-L]
- National Science Foundation [IOS10-45256]
- National Institutes of Health [1R01 GM094428, NS27177, 1R01 GM43644]
- Department of Energy [DE-FG02-11ER16007]
- Howard Hughes Medical Institute
- Gordon and Betty Moore Foundation
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1045256] Funding Source: National Science Foundation
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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.
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