Document Detail

L-DOPA increases lignification associated with Glycine max root growth-inhibition.
MedLine Citation:
PMID:  17195115     Owner:  NLM     Status:  MEDLINE    
L-3,4-dihydroxyphenylalanine (L: -DOPA), an allelochemical exuded from the roots of velvet bean [Mucuna pruriens (L.) DC. var. utilis], presents a highly inhibitory action to plant growth. The effects of L-DOPA on phenylalanine ammonia-lyase (PAL, EC and peroxidase (POD, EC activities, and phenolic compound and lignin content in soybean [Glycine max (L.) Merr.] roots were investigated to determine the possible phytotoxic mechanism. Three-day-old seedlings were cultivated in half-strength Hoagland nutrient solution (pH 6.0), without or with 0.1 to 1.0 mM L-DOPA in a growth chamber (25 degrees C, 12-hr light to 12-hr darkness photoperiod, irradiance of 280 micromol m-2 s-1) for 24 hr. In general, the length, fresh weight, and dry weight of the roots decreased, whereas PAL and POD activities and phenolic compound and lignin content increased after L-DOPA treatments. Results showed the susceptibility of soybean to L-DOPA and reinforce the role of this nonprotein amino acid as a strong allelochemical. The present findings also suggest that L-DOPA-induced inhibition in soybean roots may be because of a cell wall stiffening process related to the formation of cross-linking between cell wall polymers linked to lignin production.
Anderson Ricardo Soares; Maria de Lourdes Lucio Ferrarese; Rita de Cássia Siqueira; Franciele Mara Lucca Zanardo Böhm; Osvaldo Ferrarese-Filho
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-12-29
Journal Detail:
Title:  Journal of chemical ecology     Volume:  33     ISSN:  0098-0331     ISO Abbreviation:  J. Chem. Ecol.     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-17     Completed Date:  2007-05-21     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  7505563     Medline TA:  J Chem Ecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  265-75     Citation Subset:  IM    
Laboratory of Plant Biochemistry, Department of Biochemistry, University of Maringá, Av. Colombo, 5790, 87020-900, Maringá, PR, Brazil.
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MeSH Terms
Levodopa / pharmacology*
Lignin / metabolism*
Mucuna / chemistry
Peroxidase / drug effects,  metabolism
Phenylalanine Ammonia-Lyase / drug effects,  metabolism
Plant Growth Regulators / pharmacology*
Plant Roots / drug effects*,  metabolism
Soybeans / drug effects*,  growth & development,  metabolism
Reg. No./Substance:
0/Levodopa; 0/Plant Growth Regulators; 9005-53-2/Lignin; EC; EC Ammonia-Lyase

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