| Abstract: | An application of the methods of irreversible thermodynamicsto the fluxes in plant xylem is examined, and an expressionis derived for the electric current present when a length ofstem is short circuted. After examination of the electrode by-passingefficiency, bioelectricity in Cayratia clematidea (F. Muell.)Domin., maintained under conditions of adequate soil water,is shown to reflect changes in the transpiration rate. Pressuregradients and sap velocities in C. clematidea are estimatedfrom short-circuit current data. It is suggested that the experimentaltechnique described may be useful for continuous measurementsof sap flow or transpiration without disturbing the plant environment. |
