期刊
PHYTOCHEMISTRY
卷 77, 期 -, 页码 89-98出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2011.12.011
关键词
Grape leaf tissue; Vitis vinifera; Vitaceae; UV-B radiation; Terpene metabolism
资金
- Fondo para la Investigacion Cientifica y Tecnologica (FONCYT) [PICT 2008 1666, PICT 2007 02190]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Secretaria de Ciencia y Tecnica-Universidad Nacional de Cuyo
- INTA
This study investigated the terpene profiles as determined by GC-EIMS analysis of in vitro cultured plants of Vitis vinifera exposed to a field-like dose of UV-B (4.75 kJ m(-2) d(-1)) administered at two different fluence rates (low, 16 h at 8.25 mu W cm(-2), and high 4 h at 33 mu W cm(-2)). Low UV-B treatment increased levels of the membrane-related triterpenes sitosterol, stigmasterol and lupeol, more notable in young leaves, suggesting elicitation of a mechanism for grapevine acclimation. By contrast, accumulation of compounds with antioxidant properties, diterpenes alpha and gamma tocopherol and phytol, the sesquiterpene E-nerolidol and the monoterpenes carene, alpha-pinene and terpinolene had maximum accumulation under high UV-B, which was accentuated in mature leaves. Also the levels of the sesquiterpenic stress-related hormone abscisic acid (ABA) increased under high UV-B, although 24 h post irradiation ABA concentrations decreased. Such increments of antioxidant terpenes along with ABA suggest elicitation of mechanism of defense. The adaptative responses induced by relatively low UV-B irradiations as suggested by synthesis of terpenes related with membrane stability correlated with augments in terpene synthase activity. (C) 2011 Elsevier Ltd. All rights reserved.
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