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Estimates of root hydraulic conductivity (Lp) were obtained on intact peach  (Prunus persica  ×  P. davidiana  `Nemaguard') and sour orange (Citrus  aurantium  L.) rootstock over a broad range of transpiration rates. Within a species, Lp was lower when estimated using the Ohm's law analog than the reciprocal of the slope of the linear regression between transpiration (E) and stem xylem water potential (Ψ). Nonzero y-intercepts in linear regressions of Ψ vs. E resulted in the lack of agreement between Lp estimates. Removal of the root system caused xylem Ψ to rapidly approach zero in both species when E ≈ 0, suggesting that factors responsible for nonzero y intercepts resided within roots. Lp was 2.2 and 3.5 times lower for sour orange than peach when calculated by the Ohm's law and regression methods, respectively.

Estimation of Root Hydraulic Conductivity on Intact Peach and Citrus Rootstock