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J Exp Bot

Title:		The dual effects of root-cap exudates on nematodes: from quiescence in plant-parasitic nematodes to frenzy in entomopathogenic nematodes
Author(s):		Hiltpold I; Jaffuel G; Turlings TC;
Address:		"Division of Plant Sciences, University of Missouri, 205 Curtis Hall, Columbia, MO 65211-7020, USA hiltpoldi@missouri.edu. FARCE laboratory, University of Neuchatel, Emile-Argand 11, 2000 Neuchatel, Switzerland"
Journal Title:		J Exp Bot
Year:		2015
Volume:		20140827
Issue:		2
Page Number:		603 - 611
DOI:		10.1093/jxb/eru345
ISSN/ISBN:		1460-2431 (Electronic) 0022-0957 (Print) 0022-0957 (Linking)
Abstract:		"To defend themselves against herbivores and pathogens, plants produce numerous secondary metabolites, either constitutively or de novo in response to attacks. An intriguing constitutive example is the exudate produced by certain root-cap cells that can induce a state of reversible quiescence in plant-parasitic nematodes, thereby providing protection against these antagonists. The effect of such root exudates on beneficial entomopathogenic nematodes (EPNs) remains unclear, but could potentially impair their use in pest management programmes. We therefore tested how the exudates secreted by green pea (Pisum sativum) root caps affect four commercial EPN species. The exudates induced reversible quiescence in all EPN species tested. Quiescence levels varied with the green pea cultivars tested. Notably, after storage in root exudate, EPN performance traits were maintained over time, whereas performances of EPNs stored in water rapidly declined. In sharp contrast to high concentrations, lower concentrations of the exudate resulted in a significant increase in EPN activity and infectiousness, but still reduced the activity of two plant-parasitic nematode species. Our study suggests a finely tuned dual bioactivity of the exudate from green pea root caps. Appropriately formulated, it can favour long-term storage of EPNs and boost their infectiousness, while it may also be used to protect plants from plant-parasitic nematodes"
Keywords:		Animals Host-Parasite Interactions/*drug effects Nematoda/drug effects/*physiology Peas/chemistry Plant Exudates/*pharmacology Plant Root Cap/*chemistry Temperature Time Factors Below-ground food web Heterodera glycine Heterorhabditis bacteriophora Meloid;
Notes:		"MedlineHiltpold, Ivan Jaffuel, Geoffrey Turlings, Ted C J eng Research Support, Non-U.S. Gov't England 2014/08/29 J Exp Bot. 2015 Feb; 66(2):603-11. doi: 10.1093/jxb/eru345. Epub 2014 Aug 27"