Document Detail

The auxin influx carriers AUX1 and LAX3 are involved in auxin-ethylene interactions during apical hook development in Arabidopsis thaliana seedlings.
MedLine Citation:
PMID:  20110325     Owner:  NLM     Status:  MEDLINE    
Dark-grown dicotyledonous seedlings form a hook-like structure at the top of the hypocotyl, which is controlled by the hormones auxin and ethylene. Hook formation is dependent on an auxin signal gradient, whereas hook exaggeration is part of the triple response provoked by ethylene in dark-grown Arabidopsis seedlings. Several other hormones and light are also known to be involved in hook development, but the molecular mechanisms that lead to the initial installation of an auxin gradient are still poorly understood. In this study, we aimed to unravel the cross-talk between auxin and ethylene in the apical hook. Auxin measurements, the expression pattern of the auxin reporter DR5::GUS and the localization of auxin biosynthesis enzymes and influx carriers collectively indicate the necessity for auxin biosynthesis and efficient auxin translocation from the cotyledons and meristem into the hypocotyl in order to support proper hook development. Auxin accumulation in the meristem and cotyledons and in the hypocotyl is increased approximately 2-fold upon treatment with ethylene. In addition, a strong ethylene signal leads to enhanced auxin biosynthesis at the inner side of the hook. Finally, mutant analysis demonstrates that the auxin influx carrier LAX3 is indispensable for proper hook formation, whereas the auxin influx carrier AUX1 is involved in the hook exaggeration phenotype induced by ethylene.
Filip Vandenbussche; Jan Petr?sek; Petra Z?dn?kov?; Kl?ra Hoyerov?; Bedrich Pesek; Vered Raz; Ranjan Swarup; Malcolm Bennett; Eva Zaz?malov?; Eva Benkov?; Dominique Van Der Straeten
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Development (Cambridge, England)     Volume:  137     ISSN:  1477-9129     ISO Abbreviation:  Development     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-01-29     Completed Date:  2010-03-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8701744     Medline TA:  Development     Country:  England    
Other Details:
Languages:  eng     Pagination:  597-606     Citation Subset:  IM    
Unit Plant Hormone Signaling and Bio-imaging, Department of Physiology, Ghent University, Gent, Belgium.
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MeSH Terms
Arabidopsis / drug effects,  genetics,  growth & development*,  metabolism*
Arabidopsis Proteins / genetics,  metabolism*
Ethylenes / pharmacology
Gene Expression Regulation, Developmental
Gene Expression Regulation, Plant
Genes, Plant
Hypocotyl / growth & development,  metabolism
Indoleacetic Acids / metabolism*
Membrane Transport Proteins / genetics,  metabolism*
Meristem / drug effects,  growth & development,  metabolism
Plants, Genetically Modified
Seedling / drug effects,  growth & development,  metabolism
Reg. No./Substance:
0/AUX1 protein, Arabidopsis; 0/Arabidopsis Proteins; 0/Ethylenes; 0/Indoleacetic Acids; 0/LAX3 protein, Arabidopsis; 0/Membrane Transport Proteins; 74-85-1/ethylene; 87-51-4/indoleacetic acid

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