Document Detail

Long-term inhibition by auxin of leaf blade expansion in bean and Arabidopsis.
MedLine Citation:
PMID:  14988474     Owner:  NLM     Status:  MEDLINE    
The role of auxin in controlling leaf expansion remains unclear. Experimental increases to normal auxin levels in expanding leaves have shown conflicting results, with both increases and decreases in leaf growth having been measured. Therefore, the effects of both auxin application and adjustment of endogenous leaf auxin levels on midrib elongation and final leaf size (fresh weight and area) were examined in attached primary monofoliate leaves of the common bean (Phaseolus vulgaris) and in early Arabidopsis rosette leaves. Aqueous auxin application inhibited long-term leaf blade elongation. Bean leaves, initially 40 to 50 mm in length, treated once with alpha-naphthalene acetic acid (1.0 mm), were, after 6 d, approximately 80% the length and weight of controls. When applied at 1.0 and 0.1 mm, alpha-naphthalene acetic acid significantly inhibited long-term leaf growth. The weak auxin, beta-naphthalene acetic acid, was effective at 1.0 mm; and a weak acid control, benzoic acid, was ineffective. Indole-3-acetic acid (1 microm, 10 microm, 0.1 mm, and 1 mm) required daily application to be effective at any concentration. Application of the auxin transport inhibitor, 1-N-naphthylphthalamic acid (1% [w/w] in lanolin), to petioles also inhibited long-term leaf growth. This treatment also was found to lead to a sustained elevation of leaf free indole-3-acetic acid content relative to untreated control leaves. Auxin-induced inhibition of leaf growth appeared not to be mediated by auxin-induced ethylene synthesis because growth inhibition was not rescued by inhibition of ethylene synthesis. Also, petiole treatment of Arabidopsis with 1-N-naphthylphthalamic acid similarly inhibited leaf growth of both wild-type plants and ethylene-insensitive ein4 mutants.
Christopher P Keller; Rainer Stahlberg; Lana S Barkawi; Jerry D Cohen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2004-02-26
Journal Detail:
Title:  Plant physiology     Volume:  134     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2004 Mar 
Date Detail:
Created Date:  2004-03-15     Completed Date:  2004-05-27     Revised Date:  2010-09-21    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1217-26     Citation Subset:  IM    
Department of Biology, Minot State University, 500 University Avenue West, Minot, North Dakota 58707, USA.
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MeSH Terms
Arabidopsis / drug effects*,  genetics,  growth & development*
Arabidopsis Proteins / genetics
Ethylenes / biosynthesis
Genes, Plant
Indoleacetic Acids / metabolism,  pharmacology*
Naphthaleneacetic Acids / pharmacology
Phaseolus / drug effects*,  growth & development*,  metabolism
Plant Leaves / drug effects,  growth & development
Receptors, Cell Surface / genetics
Reg. No./Substance:
0/Arabidopsis Proteins; 0/EIN4 protein, Arabidopsis; 0/Ethylenes; 0/Indoleacetic Acids; 0/Naphthaleneacetic Acids; 0/Receptors, Cell Surface; 74-85-1/ethylene; 86-87-3/1-naphthaleneacetic acid

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