title: Effect of irrigation regime on perceived astringency and proanthocyanidin composition of skins and seeds of Vitis vinifera L. cv. Syrah grapes under semiarid conditions.
abstract: In this work, the effect of water availability on astringency of seed and skin extracts of Vitis vinifera cv. Syrah berries under the typical semiarid conditions of Greece was investigated. Moreover, astringency was assessed in relation to proanthocyanidin composition. For this purpose, three irrigation treatments were applied starting at berry set through harvest of 2011 and 2012: full irrigation (FI) at 100% of crop evapotranspiration, deficit irrigation (DI) at 50% and non-irrigated (NI). FI skin and seed extracts were perceived significantly more astringent than NI. Total phenol, total tannin, (+)-catechin, (-)-epicatechin and procyanidin C1 concentrations were positively correlated with astringency. Positive correlations were also obtained among astringency and average degree of polymerization and proportion of the extension units of shorter tannins while astringency of larger tannins was correlated with the proportion of terminal units. On the contrary, total anthocyanin and epigallocatechin contents were negatively correlated with astringency.
authors.affiliation: Department of Food Science & Human Nutrition, Agricultural University of Athens, Laboratory of Enology, 11855 Athens, Greece.
authors.forename: Maria
authors.initials: M
authors.lastname: Kyraleou
authors.affiliation: Department of Food Science & Human Nutrition, Agricultural University of Athens, Laboratory of Enology, 11855 Athens, Greece.
authors.forename: Yorgos
authors.initials: Y
authors.lastname: Kotseridis
authors.affiliation: Laboratory of Viticulture, School of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
authors.forename: Stefanos
authors.initials: S
authors.lastname: Koundouras
authors.affiliation: Univ. Bordeaux, ISVV, EA 4577, Œnologie, 210 Chemin de Leysotte, 33140 Villenave d'Ornon, France; INRA, ISVV, USC 1366 Œnologie, 210 Chemin de Leysotte, 33140 Villenave d'Ornon, France.
authors.forename: Kleopatra
authors.initials: K
authors.lastname: Chira
authors.affiliation: Univ. Bordeaux, ISVV, EA 4577, Œnologie, 210 Chemin de Leysotte, 33140 Villenave d'Ornon, France; INRA, ISVV, USC 1366 Œnologie, 210 Chemin de Leysotte, 33140 Villenave d'Ornon, France.
authors.forename: Pierre-Louis
authors.initials: PL
authors.lastname: Teissedre
authors.affiliation: Department of Food Science & Human Nutrition, Agricultural University of Athens, Laboratory of Enology, 11855 Athens, Greece. Electronic address: stamatina@aua.gr.
authors.forename: Stamatina
authors.initials: S
authors.lastname: Kallithraka
mesh_terms: D057914:Agricultural Irrigation / Q000379:methods*; D000872:Anthocyanins / Q000032:analysis; D044946:Biflavonoids / Q000032:analysis; D002392:Catechin / Q000031:analogs & derivatives / Q000032:analysis; D003889:Desert Climate; D005638:Fruit / Q000737:chemistry*; D006115:Greece; D006801:Humans; D010636:Phenols / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry; D044945:Proanthocyanidins / Q000032:analysis*; D012639:Seeds / Q000737:chemistry*; D013634:Tannins / Q000032:analysis; D013649:Taste; D027843:Vitis / Q000737:chemistry / Q000254:growth & development*; D014867:Water / Q000378:metabolism
chemical_list: D000872:Anthocyanins; D044946:Biflavonoids; D010636:Phenols; D010936:Plant Extracts; D044945:Proanthocyanidins; D013634:Tannins; D014867:Water; C013221:proanthocyanidin; C017674:procyanidin; D002392:Catechin; C057580:gallocatechol
keywords: Astringency; Percent galloylation; Proanthocyanidins; Tannin mean polymerization degree; Water deficit