« Previous AbstractEvaluation of putative allelochemicals in rice root exudates for their role in the suppression of arrowhead root growth    Next AbstractLarge-scale preparation of clove essential oil and eugenol-loaded liposomes using a membrane contactor and a pilot plant »

J Chem Ecol

Title:		Identification and quantitation of compounds in a series of allelopathic and non-allelopathic rice root exudates
Author(s):		Seal AN; Pratley JE; Haig T; An M;
Address:		"Farrer Centre, Charles Sturt University Locked Bag 588 Wagga Wagga, New South Wales, Australia 2678. aseal@csu.edu.au"
Journal Title:		J Chem Ecol
Year:		2004
Volume:		30
Issue:		8
Page Number:		1647 - 1662
DOI:		10.1023/b:joec.0000042074.96036.14
ISSN/ISBN:		0098-0331 (Print) 0098-0331 (Linking)
Abstract:		"An investigation of the chemical basis for rice allelopathy to the rice weed arrowhead (Sagittaria montevidensis) was undertaken using GC/MS and GC/MS/MS techniques. Twenty-five compounds were isolated and identified from the root exudates of both allelopathic and non-allelopathic rice varieties. Phenolics, phenylalkanoic acids, and indoles were among the chemical classes identified. Two indoles previously unreported in rice were detected in the exudates, 5-hydroxy-2-indolecarboxylic acid and 5-hydroxyindole-3-acetic acid. Several other compounds identified in this study have not previously been reported in rice root exudates, namely mercaptoacetic acid, 4-hydroxyphenylacetic acid, and 4-vinylphenol. The levels of 15 compounds present in the exudates were quantified using GC/MS/MS. Six of the seven most abundant compounds were phenolic acids. Significant differences exist between the allelopathic and non-allelopathic cultivars in their production of three of these six compounds. Greater amounts of trans-ferulic acid, p-hydroxybenzoic acid, and caffeic acid were detected in the exudates of allelopathic cultivars. The seventh compound, abietic acid, was significantly higher in the non-allelopathic cultivars"
Keywords:		Abietanes/analysis Caffeic Acids/analysis Coumaric Acids/analysis Gas Chromatography-Mass Spectrometry Hydroxybenzoates/analysis Indoles/analysis Oryza/*chemistry Phenanthrenes/analysis Phenols/analysis Phenylacetates/analysis Pheromones/*analysis/chemist;
Notes:		"MedlineSeal, Alexa N Pratley, James E Haig, Terry An, Min eng Research Support, Non-U.S. Gov't 2004/11/13 J Chem Ecol. 2004 Aug; 30(8):1647-62. doi: 10.1023/b:joec.0000042074.96036.14"