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Planta

Title:		Larval feeding induced defensive responses in tobacco: comparison of two sibling species of Helicoverpa with different diet breadths
Author(s):		Zong N; Wang CZ;
Address:		"State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, The Chinese Academy of Sciences, 25 Beisihuanxi Road, Haidian, Beijing, 100080, China"
Journal Title:		Planta
Year:		2007
Volume:		20070110
Issue:		1
Page Number:		215 - 224
DOI:		10.1007/s00425-006-0459-x
ISSN/ISBN:		0032-0935 (Print) 0032-0935 (Linking)
Abstract:		"Plants respond differently to damage by different herbivorous insects. We speculated that sibling herbivorous species with different host ranges might also influence plant responses differently. Such differences may be associated with the diet breadth (specialization) of herbivores within a feeding guild, and the specialist may cause less intensive plant responses than the generalist. The tobacco Nicotinana tabacum L. is the common host plant of a generalist Helicoverpa armigera (Hubner) and a specialist H. assulta Guenee (Lepidoptera, Noctuidae). The induced responses of tobacco to feeding of these two noctuid herbivores and mechanical wounding were compared. The results showed that the feeding of the specialist H. assulta and the generalist H. armigera resulted in the same inducible defensive system, but response intensity of plants was different to these two species. Inductions of jasmonic acid (JA), lipoxygenase (LOX), and proteinase inhibitors (PIs) were not significantly different concerning these two species, but H. assulta caused the less intensive foliar polyphenol oxidase (PPO) increase, more intensive nicotine and peroxidase (POD) increases in tobacco than H. armigera. The defensive response of plant to herbivores with different diet breadth seems to be more complicated than we expected, and the specialist does not necessarily cause less intensive plant responses than the generalist"
Keywords:		Animals Catechol Oxidase/metabolism Cyclopentanes/metabolism Ecosystem Larva/metabolism Lipoxygenase/metabolism Moths/*metabolism Nicotine/metabolism Oxylipins Peroxidase/metabolism Plant Leaves Plant Proteins/chemistry/metabolism Protease Inhibitors/meta;
Notes:		"MedlineZong, Na Wang, Chen-Zhu eng Comparative Study Research Support, Non-U.S. Gov't Germany 2007/01/12 Planta. 2007 Jun; 226(1):215-24. doi: 10.1007/s00425-006-0459-x. Epub 2007 Jan 10"