Document Detail


Auxin response, but not its polar transport, plays a role in hydrotropism of Arabidopsis roots.
MedLine Citation:
PMID:  17244629     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Plants are sessile in nature, and need to detect and respond to many environmental cues in order to regulate their growth and orientation. Indeed, plants sense numerous environmental cues and respond via appropriate tropisms, and it is widely accepted that auxin plays an important role in these responses. Recent analyses using Arabidopsis have emphasized the importance of polar auxin transport and differential auxin responses to gravitropism. Even so, the involvement of auxin in hydrotropism remains unclear. To clarify whether or not auxin is involved in the hydrotropic response, Arabidopsis seedlings were treated with inhibitors of auxin influx (3-chloro-4-hydroxyphenylacetic acid), efflux (1-naphthylphthalemic acid and 2,3,5-triiodobenzoic acid), and response (p-chlorophenoxyisobutylacetic acid), and their effects were examined on both hydrotropic and gravitropic responses. In agreement with previous reports, gravitropism was inhibited by all the chemicals tested. By contrast, only an inhibitor of the auxin response (p-chlorophenoxyisobutylacetic acid) reduced hydrotropism, whereas inhibitors for influx or efflux of auxin had no effect. These results suggest that auxin response, apart from its polar transport, plays a definite role in hydrotropic response, and will evoke a new concept for the auxin-mediated regulation of tropisms.
Authors:
Tomoko Kaneyasu; Akie Kobayashi; Mayumi Nakayama; Nobuharu Fujii; Hideyuki Takahashi; Yutaka Miyazawa
Related Documents :
16295849 - Role of organic acids in promoting colloidal transport of mercury from mine tailings.
17409279 - Thyroid hormone deficiency alters expression of acid-base transporters in rat kidney.
3453089 - Asparagine transport and the induction of ornithine decarboxylase in h-35 rat hepatoma ...
16787639 - Ala-504 is a determinant of substrate binding affinity in the mouse na(+)/dicarboxylate...
7608199 - Substrate specificity and expression profile of amino acid transporters (aaps) in arabi...
15539319 - Human peripheral blood mononuclear cells: ; inhibition of biotin transport by reversibl...
24416789 - V-atpase as an effective therapeutic target for sarcomas.
12204229 - Characterisation and developmental expression of a chitinase gene in heterodera glycines.
8678919 - Effects of saturated, mono-, and polyunsaturated fatty acids on the secretion of apo b ...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-01-22
Journal Detail:
Title:  Journal of experimental botany     Volume:  58     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2007  
Date Detail:
Created Date:  2007-04-09     Completed Date:  2007-07-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1143-50     Citation Subset:  IM    
Affiliation:
Graduate School of Life Sciences, Tohoku University, Sendai, 980-8577, Japan.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Arabidopsis / drug effects,  growth & development,  metabolism*
Biological Transport / physiology*
Indoleacetic Acids / antagonists & inhibitors,  metabolism*
Phenylacetates / pharmacology
Plant Roots / drug effects,  growth & development,  metabolism*
Seedling / drug effects,  growth & development
Time Factors
Triiodobenzoic Acids / pharmacology
Tropism / physiology*
Water / metabolism*
Chemical
Reg. No./Substance:
0/Indoleacetic Acids; 0/Phenylacetates; 0/Triiodobenzoic Acids; 33697-81-3/3-chloro-4-hydroxyphenylacetic acid; 7732-18-5/Water; 88-82-4/2,3,5-triiodobenzoic acid

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


Previous Document:  A germin-like protein with superoxide dismutase activity in pea nodules with high protein sequence i...
Next Document:  Co-ordinated gene expression during phases of dormancy release in raspberry (Rubus idaeus L.) buds.