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Table 3 Summary of berry composition changes following 10 days of sub-ambient CO2 supply, and comparison of total canopy carbon assimilation with berry sugar accumulation during the corresponding period

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

 

Berry composition comparison

Source-sink parameters

 

Soluble solids (°brix)

Glucose (g /L)

Fructose (g/L)

Carbon assimilation (g vine−1)

Berry sugar gain

Berry C / assimilated C

 

Dec 26

Jan 5

Dec 26

Jan 5

Dec 26

Jan 5

CO2

(g vine−1)

%

Ambient

5.6

11.5

14.6

51.3

6.9

43.7

652

223

50

Sub-ambient

5.4

9.8

16.7

42.1

8.3

35.2

302

166

72

Treatment

ns

**

ns

**

ns

**

***

ns

*