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J Chem Ecol

Title:		Wheat gene expression is differentially affected by a virulent Russian wheat aphid biotype
Author(s):		Liu X; Meng J; Starkey S; Smith CM;
Address:		"Department of Plant Biology, North Carolina State University, Raleigh, NC 27695, USA"
Journal Title:		J Chem Ecol
Year:		2011
Volume:		20110416
Issue:		5
Page Number:		472 - 482
DOI:		10.1007/s10886-011-9949-9
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"An improved understanding of the complex interactions between plants and aphids is emerging. Recognition of aphid feeding in plant tissues involves production of several defense response signaling pathways and downstream production of defense and detoxification compounds. Feeding by Russian wheat aphid, Diuraphis noxia (Kurdjumov), a serious pest of cereal crops worldwide, induces foliar deformity and chlorophyll loss during compatible wheat-D. noxia interactions. Experiments described here revealed significant differences in level and pattern of gene expression in defense response signaling and metabolic pathways between compatible and incompatible D. noxia-wheat interactions. The jasmonate (JA)-signaling genes LOX, AOS, and AOC were significantly more upregulated (~3- to 7 fold) in incompatible interactions than in compatible interactions (~2.5 to 3.5 fold) as early as 1 h post D. noxia infestation (hpi). Cellulose synthase, responsible for strengthening plant cell walls via cellulose production, was also more upregulated in incompatible interactions (4 to 7 fold) than in compatible interactions (1 to 3.5 fold). In contrast, glycolysis and citric acid cycle genes were significantly downregulated (~1.5 to 2 fold) in incompatible interactions and upregulated or less downregulated in compatible interactions from 6 to 72 hpi. Differences in expression of JA-signaling genes between feeding site tissues and non-feeding site tissues suggest that D. noxia defense response signals in wheat are restricted primarily to aphid feeding sites in the initial 6 hpi. This is the first report of differential upregulation of plant genes at 1 hpi in incompatible interactions involving aphid herbivory. Early wheat plant defense responses in incompatible D. noxia interactions at 1, 3, and 6 hpi appear to be important aspects of D. noxia resistance in wheat"
Keywords:		"Animals Aphids/*physiology Base Sequence Cyclopentanes/metabolism *Gene Expression Regulation, Plant Genes, Plant *Host-Parasite Interactions Molecular Sequence Data Oxylipins/metabolism Pentose Phosphate Pathway Plant Leaves/genetics/metabolism Salicylic;"
Notes:		"MedlineLiu, Xiang Meng, Jianye Starkey, Sharon Smith, Charles Michael eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2011/04/19 J Chem Ecol. 2011 May; 37(5):472-82. doi: 10.1007/s10886-011-9949-9. Epub 2011 Apr 16"