Oxygen isotope composition of must water in grapevine. Water deficit and rootstock effect

  1. Tardaguila, J. 3
  2. Bertamini, M. 1
  3. Reniero, F. 12
  4. Versini, G. 1
  1. 1 Centro Sperimentale, Ist. Agrario di S. Michele all'Adige, Trento, Italy
  2. 2 Institute for Environment and Sustainability
    info

    Institute for Environment and Sustainability

    Ispra, Italia

  3. 3 Universidad de Castilla-La Mancha
    info

    Universidad de Castilla-La Mancha

    Ciudad Real, España

    ROR https://ror.org/05r78ng12

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Journal:
Australian Journal of Grape and Wine Research

ISSN: 1322-7130

Year of publication: 1997

Volume: 3

Issue: 2

Pages: 84-89

Type: Article

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SCOPUS: 2-s2.0-0031518781 GOOGLE SCHOLAR

More publications in: Australian Journal of Grape and Wine Research

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Abstract

The influence of soil moisture and different rootstock genotypes on the 18O/16O 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 18O level of must-water, the differences being related to water regime and rootstock genotype, with 18O 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 18O enrichment in must-water. The differences between rootstocks in must-water 18O could not fully be explained either by the rootstock effect on VPG or on root distribution.