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Type: Journal article
Title: Hypoxia in grape berries: the role of seed respiration and lenticels on the berry pedicel and the possible link to cell death
Author: Xiao, Z.
Rogiers, S.
Sadras, V.
Tyerman, S.
Citation: Journal of Experimental Botany, 2018; 69(8):2071-2083
Publisher: Oxford University Press
Issue Date: 2018
ISSN: 0022-0957
Statement of
Zeyu Xiao, Suzy Y. Rogiers, Victor O. Sadras and Stephen D. Tyerman
Abstract: Mesocarp cell death (CD) during ripening is common in berries of seeded Vitis vinifera L wine cultivars. We examined if hypoxia within berries is linked to CD. Internal oxygen concentration ([O₂]) across the mesocarp was measured in berries from Chardonnay and Shiraz, both seeded, and Ruby Seedless, using an oxygen micro-sensor. Steep [O₂] gradients were observed across the skin and [O₂] decreased toward the middle of the mesocarp. As ripening progressed the minimum [O₂] approached zero in the seeded cultivars and correlated to the profile of CD across the mesocarp. Seed respiration declined during ripening, from a large proportion of total berry respiration early to negligible at latter stages. [O₂] increased towards the central axis corresponding to the presence of air spaces visualised using x-ray micro-CT. These air spaces connect to the pedicel where lenticels are located that are critical for berry O₂ uptake as a function of temperature, and when blocked caused hypoxia in Chardonnay berries, ethanol accumulation and CD. The implications of hypoxia in grape berries are discussed in terms of its role in CD, ripening and berry water relations.
Keywords: Grape berry; lenticels; micro-CT; oxygen sensor; pedicel; programmed cell death; respiration; seed respiration; temperature; Vitis vinifera
Description: Advance Access publication 6 March 2018
Rights: © The Author(s) 2018. Published by Oxford University Press on behalf of the Society for Experimental Biology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
RMID: 0030081884
DOI: 10.1093/jxb/ery039
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Appears in Collections:Agriculture, Food and Wine publications

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