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Mol Ecol

Title:		An ecogenomic analysis of herbivore-induced plant volatiles in Brassica juncea
Author(s):		Mathur V; Tytgat TO; Hordijk CA; Harhangi HR; Jansen JJ; Reddy AS; Harvey JA; Vet LE; van Dam NM;
Address:		"Department of Zoology, Sri Venkateswara College, University of Delhi, Benito Juarez Marg, Dhaula kuan, New Delhi, 11002, India"
Journal Title:		Mol Ecol
Year:		2013
Volume:		20131113
Issue:		24
Page Number:		6179 - 6196
DOI:		10.1111/mec.12555
ISSN/ISBN:		1365-294X (Electronic) 0962-1083 (Linking)
Abstract:		"Upon herbivore feeding, plants emit complex bouquets of induced volatiles that may repel insect herbivores as well as attract parasitoids or predators. Due to differences in the temporal dynamics of individual components, the composition of the herbivore-induced plant volatile (HIPV) blend changes with time. Consequently, the response of insects associated with plants is not constant either. Using Brassica juncea as the model plant and generalist Spodoptera spp. larvae as the inducing herbivore, we investigated herbivore and parasitoid preference as well as the molecular mechanisms behind the temporal dynamics in HIPV emissions at 24, 48 and 72 h after damage. In choice tests, Spodoptera litura moth preferred undamaged plants, whereas its parasitoid Cotesia marginiventris favoured plants induced for 48 h. In contrast, the specialist Plutella xylostella and its parasitoid C. vestalis preferred plants induced for 72 h. These preferences matched the dynamic changes in HIPV blends over time. Gene expression analysis suggested that the induced response after Spodoptera feeding is mainly controlled by the jasmonic acid pathway in both damaged and systemic leaves. Several genes involved in sulphide and green leaf volatile synthesis were clearly up-regulated. This study thus shows that HIPV blends vary considerably over a short period of time, and these changes are actively regulated at the gene expression level. Moreover, temporal changes in HIPVs elicit differential preferences of herbivores and their natural enemies. We argue that the temporal dynamics of HIPVs may play a key role in shaping the response of insects associated with plants"
Keywords:		"Animals Cyclopentanes/metabolism Female Gene Expression Regulation, Plant *Herbivory Host Specificity Hymenoptera/*physiology Larva/physiology Lepidoptera/parasitology/*physiology Mustard Plant/*chemistry/genetics Oxylipins/metabolism Plant Leaves/chemist;"
Notes:		"MedlineMathur, Vartika Tytgat, Tom O G Hordijk, Cornelis A Harhangi, Harry R Jansen, Jeroen J Reddy, A Sankara Harvey, Jeffrey A Vet, Louise E M van Dam, Nicole M eng England 2013/11/14 Mol Ecol. 2013 Dec; 22(24):6179-96. doi: 10.1111/mec.12555. Epub 2013 Nov 13"