Relationship between partial pressure of intercellular CO2 (Ci) and net CO2 assimilation in leaves of GA3 treated (T) and control (C) ‘Sauvignon Blanc’, ‘Riesling’,‘Lemberger’ and ‘Kadarka’ (summarized data of varieties). Correlation analysis of scatter diagrams shows significant relationships at or above: r0.01 = 0.39 (R2 = 0.15), d.f. = 42.
Variances of Ci and PN values between the two vintages did not affect the Ci–PN relationship, in both years Ci–PN changes showed a positive exponential correlation. Based on this correlation we can conclude that Ci values increase parallel with increasing net CO2 assimilation in a range between 10 and 24 Pa of Ci both in control and treated vines.