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Table 2 Comparisons between the calculated and directly measured phloem turgor pressures (bar)

From: Real-time measurement of phloem turgor pressure in Hevea brasiliensis with a modified cell pressure probe

Tree NO. Ψp (xylem) Ψs (xylem) Ψs (phloem) Ψp (phloem)-estimated Ψp (phloem)-PTPP Ψp (phloem)-MTM
Tree1 −5.70 −1.99 −10.03 2.34 7.28 7.11
Tree2 −6.00 −1.42 −10.73 3.31 8.37 7.73
Tree3 −6.00 −1.87 −10.83 2.96 7.095 6.38
Tree4 −6.50 −1.74 −10.13 1.89 6.84 6.3
Tree5 −4.80 −1.97 −10.65 3.88 8.45 8.03
Tree6 −7.00 −1.92 −10.98 2.06 7.80 7.22
Mean −6.00 −1.82 −10.56 2.74bB 7.64aA 7.13aA
  1. Note: Different lowercase and capital letters at the superscripts represent the significant difference at P < 0.05 and P < 0.01 respectively. Ψp (phloem)-estimated is the phloem turgor pressure estimated with the equitation, Ψp (phloem)-PTPP means the phloem turgor pressure measured with PTPP method and Ψp (phloem)-MTM represents the phloem turgor pressure measured with MTM method. For each Tree, Ψs(phloem) is the mean of at least 3 latex samples collected from three punctures. Ψp(xylem) is the mean of minimum 3 bagged twigs and Ψs(xylem) is the mean of at least 3 xylem sap samples pressed out from the twigs used for Ψs(xylem) determination. Ψp(phloem)-PTPP is a single measurement after the PTPP was well balanced while Ψp(phloem)-MTM is the maximum value of up to five MTM measurements. Ψp(phloem)-estimated is calculated from the means of Ψp(xylem), Ψs(xylem) and Ψs(phloem) of the Trees.