Impact of reduced atmospheric CO₂ and varied potassium supply on carbohydrate and potassium distribution in grapevine and grape berries (Vitis vinifera L.)
Date
2017
Authors
Coetzee, Z.
Walker, R.
Deloire, A.
Barril, C.
Clarke, S.
Rogiers, S.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Plant Physiology and Biochemistry, 2017; 120:252-260
Statement of Responsibility
Zelmari A. Coetzee, Rob R. Walker, Alain J. Deloire, Célia Barril, Simon J. Clarke, Suzy Y. Rogiers
Conference Name
Abstract
To assess the robustness of the apparent sugar-potassium relationship during ripening of grape berries, a controlled-environment study was conducted on Shiraz vines involving ambient and reduced (by 34%) atmospheric CO₂ concentrations, and standard and increased (by 67%) soil potassium applications from prior to the onset of ripening. The leaf net photoassimilation rate was decreased by 35% in the reduced CO₂ treatment. The reduction in CO₂ delayed the onset of ripening, but at harvest the sugar content of the berry pericarp was similar to that of plants grown in ambient conditions. The potassium content of the berry pericarp in the reduced CO₂ treatment was however higher than for the ambient CO₂. Berry potassium, sugar and water content were strongly correlated, regardless of treatments, alluding to a ternary link during ripening. Root starch content was lower under reduced CO₂ conditions, and therefore likely acted as a source of carbohydrates during berry ripening. Root carbohydrate reserve replenishment could also have been moderated under reduced CO₂ at the expense of berry ripening. Given that root potassium concentration was less in the vines grown in the low CO₂ atmosphere, these results point toward whole-plant fine-tuning of carbohydrate and potassium partitioning aimed at optimising fruit ripening.
School/Discipline
Dissertation Note
Provenance
Description
Available online 13 October 2017
Access Status
Rights
© 2017 Elsevier Masson SAS. All rights reserved.