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Changes in Eucalyptus camaldulensis essential oil composition as response to drought preconditioning

Colaborador(es): Leicach, Silvia Rosa | Garau, Ana María | Guarnaschelli, Ana Beatriz | Yaber Grass, Margarita A | Sztarker, Norberto D | Dato, Analía.
ISSN: 1742-9145.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ESSENTIAL OIL | EUCALYPTUS CAMALDULENSIS | NURSERY STAGE | WATER STRESS | EUCALYPTUS | HEXAPODA | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Journal of Plant Interactions Vol.5, no.3 (2010) p.205-210Resumen: Water deficit, a common constraint in forestry, is the main cause of plant stress during plantation. The survival and growth of seedlings is also compromised by herbivory during establishment. The potential of nursery preconditioning to enhance survival chances of future trees by reducing palatability or attracting beneficial insects as a result of changes in chemical defences may be an answer to overcome this situation. Changes in essential oil production and composition were evaluated by GC and GC-MS in Eucalytus camaldulensis seedlings submitted to drought during four weeks at the last stage of nursery period [20 weeks]. Significant changes in essential oil relative composition were found. Seedlings [young leaves] submitted to drought developed a terpenoid blend, which has been previously associated to mature leaves and related to their higher resistance towards herbivory. Total amount of non-oxygenated terpenes decreased by 44 percent, whereas some oxygenated sesquiterpenes [globulol, epiglobulol and ledol] were doubled, and 1,8-cineole content was enhanced by 28.3 percent.
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Water deficit, a common constraint in forestry, is the main cause of plant stress during plantation. The survival and growth of seedlings is also compromised by herbivory during establishment. The potential of nursery preconditioning to enhance survival chances of future trees by reducing palatability or attracting beneficial insects as a result of changes in chemical defences may be an answer to overcome this situation. Changes in essential oil production and composition were evaluated by GC and GC-MS in Eucalytus camaldulensis seedlings submitted to drought during four weeks at the last stage of nursery period [20 weeks]. Significant changes in essential oil relative composition were found. Seedlings [young leaves] submitted to drought developed a terpenoid blend, which has been previously associated to mature leaves and related to their higher resistance towards herbivory. Total amount of non-oxygenated terpenes decreased by 44 percent, whereas some oxygenated sesquiterpenes [globulol, epiglobulol and ledol] were doubled, and 1,8-cineole content was enhanced by 28.3 percent.

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