A whole canopy gas exchange system for the targeted manipulation of grapevine source-sink relations using sub-ambient CO2.

Jason Smith, Everard Edwards, Amanda Walker, Julia Gouot, Celia Barril, Bruno Holzapfel

Research output: Contribution to journalArticle

Abstract

Elucidating the effect of source-sink relations on berry composition is of interest for wine grape production as it represents a mechanistic link between yield, photosynthetic capacity and wine quality. However, the specific effects of carbohydrate supply on berry composition are difficult to study in isolation as leaf area or crop adjustments can also change fruit exposure, or lead to compensatory growth or photosynthetic responses. A new experimental system was therefore devised to slow berry sugar accumulation without changing canopy structure or yield. This consisted of six transparent 1.2 m3 chambers to enclose large pot-grown grapevines, and large soda-lime filled scrubbers that reduced carbon dioxide (CO2) concentration of day-time supply air by approximately 200 ppm below ambient.
Original languageEnglish
Article number535
JournalBMC Plant Biology
Volume19
Publication statusPublished - 2019

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