Strong induction of minor terpenes in Italian cypress, Cupressus sempervirens, in response to infection by the fungus Seiridium cardinale
Achotegui-Castells, Ander (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Danti, Roberto (Istituto per la Protezione Sostenibile delle Piante)
Llusià Benet, Joan (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Della Rocca, Gianni (Istituto per la Protezione Sostenibile delle Piante)
Barberini, Sara (Istituto per la Protezione Sostenibile delle Piante)
Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)

Data:	2015
Resum:	Seiridium cardinale, the main fungal pathogen responsible for cypress bark canker, is the largest threat to cypresses worldwide. The terpene response of canker-resistant clones of Italian cypress, Cupressus sempervirens, to two differently aggressive isolates of S. cardinale was studied. Phloem terpene concentrations, foliar terpene concentrations, as well as foliar terpene emission rates were analyzed 1, 10, 30, and 90 days after artificial inoculation with fungal isolates. The phloem surrounding the inoculation point exhibited de novo production of four oxygenated monoterpenes and two unidentified terpenes. The concentrations of several constitutive mono- and diterpenes increased strongly (especially α- thujene, sabinene, terpinolene, terpinen-4-ol, oxygenated monoterpenes, manool, and two unidentified diterpenes) as the infection progressed. The proportion of minor terpenes in the infected cypresses increased markedly from the first day after inoculation (from 10 % in the control to 30-50 % in the infected treatments). Foliar concentrations showed no clear trend, but emission rates peaked at day 10 in infected trees, with higher δ-3-carene (15-fold) and total monoterpene (10-fold) emissions than the control. No substantial differences were found among cypresses infected by the two fungal isolates. These results suggest that cypresses activate several direct and indirect chemical defense mechanisms after infection by S. cardinale.
Ajuts:	Ministerio de Economía y Competitividad CGL2013-48074-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-274 European Commission 610028 European Commission FP0903
Nota:	Altres ajuts: Project CypFire EC/2G-MED09-070
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	VOCs ; Cypress bark canker ; Sabinene ; Manool ; Oxygenated monoterpenes ; De novo
Publicat a:	Journal of chemical ecology, Vol. 41 Issue 3 (March 2015) , p. 224-243, ISSN 0098-0331

DOI: 10.1007/s10886-015-0554-1

Post-print 40 p, 1.8 MB

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