Fig. 4

Activity of plasma membrane H⁺-ATPase and sucrose-degradation enzymes of breadfruit scion stems on different rootstocks at 22 months after grafting. The activity of plasma membrane H⁺-ATPase, represented as the vanadate-sensitive ATPase, was calculated from the difference between activities in the absence and presence of 1 mM Na₃VO₄. PM H⁺-ATPase, plasma membrane H + -ATPase; SAI, soluble acid invertase; NIV, neutral invertase. All values represent mean ± SE of three biological replicates (* p < 0.05)