Document Detail

Genetic analysis of the effects of polar auxin transport inhibitors on root growth in Arabidopsis thaliana.
MedLine Citation:
PMID:  9032965     Owner:  NLM     Status:  MEDLINE    
Polar auxin transport inhibitors, including N-1-naphthylphthalamic acid (NPA) and 2,3,5-triiodobenzoic acid (TIBA), have various effects on physiological and developmental events, such as the elongation and tropism of roots and stems, in higher plants. We isolated NPA-resistant mutants of Arabidopsis thaliana, with mutations designated pir1 and pir2, that were also resistant to TIBA. The mutations specifically affected the root-elongation process, and they were shown ultimately to be allelic to aux1 and ein2, respectively, which are known as mutations that affect responses to phytohormones. The mechanism of action of auxin transport inhibitors was investigated with these mutants, in relation to the effects of ethylene, auxin, and the polar transport of auxin. With respect to the inhibition of root elongation in A. thaliana, we demonstrated that (1) the background level of ethylene intensifies the effects of auxin transport inhibitors, (2) auxin transport inhibitors might act also via an inhibitory pathway that does not involve ethylene, auxin, or the polar transport of auxin, (3) the hypothesis that the inhibitory effect of NPA on root elongation is due to high-level accumulation of auxin as a result of blockage of auxin transport is not applicable to A. thaliana, and (4) in contrast to NPA, TIBA itself has a weak auxin-like inhibitory effect.
H Fujita; K Syono
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant & cell physiology     Volume:  37     ISSN:  0032-0781     ISO Abbreviation:  Plant Cell Physiol.     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1997-03-25     Completed Date:  1997-03-25     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  9430925     Medline TA:  Plant Cell Physiol     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  1094-101     Citation Subset:  IM; S    
Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Japan.
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MeSH Terms
Arabidopsis / genetics,  growth & development,  physiology
Biological Transport
Drug Resistance
Ethylenes / chemistry
Indoleacetic Acids / antagonists & inhibitors*
Phthalimides / chemistry*
Plant Roots / growth & development
Triiodobenzoic Acids / chemistry*
Reg. No./Substance:
0/Ethylenes; 0/Indoleacetic Acids; 0/Phthalimides; 0/Triiodobenzoic Acids; 132-66-1/alpha-naphthylphthalamic acid; 74-85-1/ethylene; 88-82-4/2,3,5-triiodobenzoic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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