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J Chem Ecol

Title:		Acquired and R-gene-mediated resistance against the potato aphid in tomato
Author(s):		Cooper WC; Jia L; Goggin FL;
Address:		"Department of Entomology, University of Arkansas Agriculture Building, Fayetteville, Arkansas, USA"
Journal Title:		J Chem Ecol
Year:		2004
Volume:		30
Issue:		12
Page Number:		2527 - 2542
DOI:		10.1007/s10886-004-7948-9
ISSN/ISBN:		0098-0331 (Print) 0098-0331 (Linking)
Abstract:		"We examined the effects of three forms of host plant resistance in tomato, Lycopersicon esculentum, on the potato aphid, Macrosiphum euphorbiae. Mi-1.2, a resistance gene (R-gene) in tomato that deters aphid feeding, reduced the population growth of both potato aphid isolates tested, although it appeared to have a greater impact on isolate WU11 than on isolate WU12. The results suggest that there may be quantitative differences in virulence between these two aphid isolates. We also examined two distinct forms of acquired resistance in tomato, jasmonic acid (JA)-dependent and salicylic acid (SA)-dependent induced defenses. Exogenous foliar application of JA triggered expression of a JA-inducible proteinase inhibitor in tomato cultivars with and without Mi-1.2, although the effects of treatment on aphid performance differed between these cultivars. JA-treatment reduced aphid population growth on a susceptible tomato cultivar that lacks Mi-1.2, but did not significantly enhance or inhibit aphid control on a near-isogenic resistant tomato cultivar that carries this gene. Foliar application of an SA analog, benzothiadiazole (BTH), was used to induce SA-dependent defenses. BTH treatment reduced the population growth of both aphid isolates on a susceptible tomato cultivar, and also enhanced aphid control on a resistant cultivar. The results indicate that both SA- and JA-dependent acquired resistance in tomato have a direct negative effect on a phloem-feeding insect. Furthermore, this study demonstrates that acquired resistance and R-gene-mediated resistance can interact for enhanced suppression of insect herbivores"
Keywords:		"Animals Aphids/genetics/*physiology Cyclopentanes/pharmacology Genes, Plant/*physiology Host-Parasite Interactions/drug effects/*genetics Solanum lycopersicum/*genetics/parasitology/physiology Oxylipins Plant Diseases/genetics/parasitology Plant Leaves/pa;"
Notes:		"MedlineCooper, W C Jia, L Goggin, F L eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2005/02/24 J Chem Ecol. 2004 Dec; 30(12):2527-42. doi: 10.1007/s10886-004-7948-9"