Document Detail


Plant hormone conjugation: a signal decision.
MedLine Citation:
PMID:  19820345     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Tight regulation of the auxin hormone indole-3-acetic acid (IAA) is crucial for plant development. Newly discovered IAA antagonists are the amide-linked tryptophan conjugates of IAA and jasmonic acid (JA). JA-Trp and IAA-Trp interfered with root gravitropism in Arabidopsis, and inhibited several responses to exogenously supplied IAA. Relatively low concentrations of the inhibitors occurred in Arabidopsis, but Pisum sativum flowers contained over 300 pmole g(-1) FW of JA-Trp. DihydroJA was an even more effective inhibitor than JA-Trp, suggesting that Trp conjugates with other JA derivatives may also be functional. JA-Trp and IAA-Trp add to the list of documented bioactive amide hormone conjugates. The only other example is JA-Ile, the recently discovered jasmonate signal. These examples establish that conjugation not only inactivates hormones, but in some cases creates novel compounds that function in hormone signaling.
Authors:
Paul Staswick
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Publication Detail:
Type:  Comment; Journal Article     Date:  2009-08-02
Journal Detail:
Title:  Plant signaling & behavior     Volume:  4     ISSN:  1559-2324     ISO Abbreviation:  Plant Signal Behav     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-10-12     Completed Date:  2010-05-03     Revised Date:  2010-09-28    
Medline Journal Info:
Nlm Unique ID:  101291431     Medline TA:  Plant Signal Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  757-9     Citation Subset:  -    
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68521, USA. pstaswick1@unl.edu
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Comment On:
Plant Physiol. 2009 Jul;150(3):1310-21   [PMID:  19458116 ]

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