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Plant Biol (Stuttg)

Title:		"Effects of phosphorus availability and genetic variation of leaf terpene content and emission rate in Pinus pinaster seedlings susceptible and resistant to the pine weevil, Hylobius abietis"
Author(s):		Blanch JS; Sampedro L; Llusia J; Moreira X; Zas R; Penuelas J;
Address:		"Global Ecology Unit CREAF-CEAB-CSIC, Universitat Autonoma de Barcelona, Bellaterra, Spain. js.blanch@creaf.uab.cat"
Journal Title:		Plant Biol (Stuttg)
Year:		2012
Volume:		20110701
Issue:
Page Number:		66 - 72
DOI:		10.1111/j.1438-8677.2011.00492.x
ISSN/ISBN:		1438-8677 (Electronic) 1435-8603 (Linking)
Abstract:		"We studied the effects of phosphorus fertilisation on foliar terpene concentrations and foliar volatile terpene emission rates in six half-sib families of Pinus pinaster Ait. seedlings. Half of the seedlings were resistant to attack of the pine weevil Hylobius abietis L., a generalist phloem feeder, and the remaining seedlings were susceptible to this insect. We hypothesised that P stress could modify the terpene concentration in the needles and thus lead to altered terpene emission patterns relevant to plant-insect signalling. The total concentration and emission rate ranged between 5732 and 13,995 mug.g(-1) DW and between 2 and 22 mug.g(-1) DW.h(-1), respectively. Storage and emission were dominated by the isomers alpha- and beta-pinene (77.2% and 84.2% of the total terpene amount amassed and released, respectively). In both resistant and susceptible families, P stress caused an increase of 31% in foliar terpene concentration with an associated 5-fold decrease in terpene emission rates. A higher terpene content in the leaves implies that the 'excess carbon', available under limiting growth conditions (P scarcity), is allocated to terpene production. Sensitive families showed a greater increase in terpene emission rates with increasing P concentrations, which could explain their susceptibility to H. abietis"
Keywords:		Animals Fertilizers Phosphorus/*metabolism Photosynthesis Pinus/*genetics/*metabolism Plant Leaves/*chemistry Plant Transpiration Terpenes/*analysis Volatile Organic Compounds/metabolism *Weevils;
Notes:		"MedlineBlanch, J-S Sampedro, L Llusia, J Moreira, X Zas, R Penuelas, J eng Research Support, Non-U.S. Gov't England 2011/10/07 Plant Biol (Stuttg). 2012 Mar; 14 Suppl 1:66-72. doi: 10.1111/j.1438-8677.2011.00492.x. Epub 2011 Jul 1"