Hypoxia in grape berries: the role of seed respiration and lenticels on the berry pedicel and the possible link to cell death

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dc.contributor.authorXiao, Z.
dc.contributor.authorRogiers, S.
dc.contributor.authorSadras, V.
dc.contributor.authorTyerman, S.D.
dc.date.issued2018
dc.descriptionAdvance Access publication 6 March 2018
dc.description.abstractMesocarp 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.
dc.description.statementofresponsibilityZeyu Xiao, Suzy Y. Rogiers, Victor O. Sadras and Stephen D. Tyerman
dc.identifier.citationJournal of Experimental Botany, 2018; 69(8):2071-2083
dc.identifier.doi10.1093/jxb/ery039
dc.identifier.issn0022-0957
dc.identifier.issn1460-2431
dc.identifier.orcidSadras, V. [0000-0002-5874-6775]
dc.identifier.orcidTyerman, S.D. [0000-0003-2455-1643]
dc.identifier.urihttp://hdl.handle.net/2440/112126
dc.language.isoen
dc.publisherOxford University Press
dc.relation.granthttp://purl.org/au-research/grants/arc/IC130100005
dc.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 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.source.urihttps://doi.org/10.1093/jxb/ery039
dc.subjectGrape berry
dc.subjectlenticels
dc.subjectmicro-CT
dc.subjectoxygen sensor
dc.subjectpedicel
dc.subjectprogrammed cell death
dc.subjectrespiration
dc.subjectseed respiration
dc.subjecttemperature
dc.subjectVitis vinifera
dc.titleHypoxia in grape berries: the role of seed respiration and lenticels on the berry pedicel and the possible link to cell death
dc.typeJournal article
pubs.publication-statusPublished

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