Impact of reduced atmospheric CO2 and varied potassium supply on carbohydrate and potassium distribution in grapevine and grape berries (Vitis vinifera L.)
Autor: | Celia Barril, Rob R. Walker, Suzy Y. Rogiers, Zelmari A. Coetzee, Simon J. Clarke, Alain Deloire |
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Rok vydání: | 2017 |
Předmět: |
2. Zero hunger
0106 biological sciences Physiology Starch Potassium food and beverages Plant physiology chemistry.chemical_element Ripening 04 agricultural and veterinary sciences Plant Science Berry 01 natural sciences 040501 horticulture chemistry.chemical_compound Horticulture chemistry Botany Carbon dioxide Genetics 0405 other agricultural sciences Sugar Water content 010606 plant biology & botany |
Zdroj: | Plant Physiology and Biochemistry. 120:252-260 |
ISSN: | 0981-9428 |
Popis: | 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. |
Databáze: | OpenAIRE |
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