highly significantp < 0.001
At low VPD, a significant correlation between vein and stomata in both G and R plants (R 2 = 0.96, and 0.88, p < 0.001) was found, which was based on lower values of both parameters compared to high VPD where the relation was highly significant too (R 2 = 0.87 and 0.93, p < 0.001) ( Figure 3 ). 2.4.