Solar UV-B radiation modifies the proportion of volatile organic compounds in flowers of field-grown grapevine (Vitis vinifera L.) cv. Malbec
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Ultraviolet-B solar radiation (UV-B) is an environmental signal with biological effects in different plant tissues. Recent investigations reported dramatic changes of terpenes with a protective role in plant tissues submitted to biotic and abiotic stresses. This study examined the volatile organic compounds (VOCs) profile in flowers of Vitis vinifera L. cv. Malbec under filtered UV-B (or not). Gas chromatography–electron impact mass spectrometry analysis of flowers resulted in the identification of 12 VOCs, including eight sesquiterpenes, two aldehydes, and two ketones, being the oxygenated sesquiterpene farnesol the most abundant. The total amount of VOCs in flowers did not change irrespective UV-B had been filtered or not, suggesting those compounds have a protective role that is constitutive of the reproductive tissues. However UV-B increases the proportion of valencene, β-farnesene, α-panasinsene and hepatriacontanedione which would require further investigation.
KeywordsAbiotic stress Grape Ultraviolet-B Terpenes VOCs
This work was funded by FONCYT (PICT 2008 1666 and PID 0149-PAE 36789) to R.B., and (PICT 2007 02190) to P.P., CONICET (PIP 2008) to P.P., and Sepcyt-UNCuyo to R.B. and P.P. M.G. and M.V.S. are recipient of CONICET scholarships; R.B., F.B. and P.P. are members of CONICET. M.P. is member of INTA. The authors thank the helpful technical assistance of L. Bolcato in GC–EIMS.
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