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Food Chem

Title:		Influence of deficit irrigation and kaolin particle film on grape composition and volatile compounds in Merlot grape (Vitis vinifera L.)
Author(s):		Song J; Shellie KC; Wang H; Qian MC;
Address:		"Northwest A & F University, Yangling, Shaanxi 712100, China"
Journal Title:		Food Chem
Year:		2012
Volume:		20120307
Issue:		2
Page Number:		841 - 850
DOI:		10.1016/j.foodchem.2012.02.193
ISSN/ISBN:		1873-7072 (Electronic) 0308-8146 (Linking)
Abstract:		"The effect of deficit irrigation and a kaolin-based, foliar reflectant particle film (PF) on grape composition and volatile compounds in Merlot grapes was investigated over two growing seasons in semi-arid, south-western Idaho. Vines were provided with differential amounts of water based on their estimated crop evapotranspiration (ET(c)) throughout berry development, and particle film was applied to half of the vines in each irrigation main plot. Free and bound volatile compounds in grapes were analyzed using stir bar sorptive extraction-gas chromatography-mass spectrometry (SBSE-GC-MS). The concentrations of free C(6) compounds (hexanal, trans-2-hexenal, and 1-hexanol) decreased, and bound terpene alcohols (nerol and geraniol) and C(13)-norisoprenoids (beta-damascenone, 3-hydroxy-beta-damascenone, 1,1,6-trimethyl-1,2-dihydronaphthalene, and 3-oxo-alpha-ionol) increased in berries each year in response to severity of vine water stress. Concentrations of C(13)-norisoprenoids and bound forms of nerol and geraniol were positively correlated with their concentrations in the corresponding wines. Particle film application had minimum effect on free and bound volatile composition in the grapes, and there was no interactive effect between particle film and deficit irrigation. However, particle film application enhanced the total amount of berry anthocyanins"
Keywords:		Agricultural Irrigation Agrochemicals/*pharmacology Fruit/chemistry/drug effects/growth & development/metabolism Idaho Kaolin/*pharmacology Vitis/*chemistry/drug effects/growth & development/metabolism Volatile Organic Compounds/*analysis/metabolism Water;
Notes:		"MedlineSong, Jianqiang Shellie, Krista C Wang, Hua Qian, Michael C eng Research Support, Non-U.S. Gov't England 2012/10/31 Food Chem. 2012 Sep 15; 134(2):841-50. doi: 10.1016/j.foodchem.2012.02.193. Epub 2012 Mar 7"