Estimation of Root Hydraulic Conductivity on Intact Peach and Citrus Rootstock

in HortScience
View More View Less
  • 1 Department of Horticulture, University of Georgia, Athens, GA 30602
  • | 2 Universitá degli Studi-Palermo, Istituto di Coltivazioni Arboree, Viale di Scienze, 90128, Palermo, Italy

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.

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 105 26 3
PDF Downloads 119 51 4