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Oxygen isotope composition of must‐water in grapevine: effects of water deficit and rootstock
Author(s) -
TARDAGUILA J.,
BERTAMINI M.,
RENIERO F.,
VERSINI G.
Publication year - 1997
Publication title -
australian journal of grape and wine research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.65
H-Index - 77
eISSN - 1755-0238
pISSN - 1322-7130
DOI - 10.1111/j.1755-0238.1997.tb00119.x
Subject(s) - rootstock , veraison , water content , δ18o , soil water , canopy , horticulture , stable isotope ratio , agronomy , viticulture , environmental science , chemistry , vitis vinifera , biology , botany , soil science , wine , geology , geotechnical engineering , food science , physics , quantum mechanics
The influence of soil moisture and different rootstock genotypes on the 18 O/ 16 O ratio of must‐water in grapes was investigated. Grapevines ( Vitis vinifera L.) with cv. Cabernet Sauvignon as scion grafted on rootstocks 101–14, 420A and 41B were subjected to three levels of plant‐available soil‐water from veraison to harvest. Significant differences were observed in the 18 O level of must‐water, the differences being related to water regime and rootstock genotype, with 18 O increasing as soil‐water became less available. The higher the canopy‐air vapour pressure gradient (VPG), the larger was the oxygen isotope content of must‐water, indicating that VPG is an important factor in determining the degree of must‐water enrichment under water deficit conditions. In all water regimes of soil, 41B induced the highest degree of 18 O enrichment in must‐water. The differences between rootstocks in must‐water 18 O could not fully be explained either by the rootstock effect on VPG or on root distribution.