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K(+) content and concentration within the apoplast of mesophyll tissue of pea (Pisum sativum L., cv Argenteum) leaflets were determined using an elution procedure. Following removal of the epidermis, a 1 centimeter (inside diameter) glass cylinder was attached to the exposed mesophyll tissue and filled with 5 millimolar CaCl(2) solution (1 degrees C). From time-course curves of cumulative K(+) diffusion from the tissue, the amount of K(+) of extracellular origin was estimated. Apoplastic K(+) contents for leaves from plants cultured in nutrient solution containing 2 or 10 millimolar K(+) were found to range from 1 to 4.5 micromoles per gram fresh weight, comprising less than 3% of the total K(+) content within the lamina tissue. Assuming an apoplastic solution volume of 0.04 to 0.1 milliliters per gram fresh weight and a Donnan cation exchange capacity of 2.63 micromoles per gram fresh weight (experimentally determined), the K(+) concentration within apoplastic solution was estimated at 2.4 to 11.8 millimolar. Net movement of Rb(+) label from the extracellular compartment within mesophyll tissue into the symplast was demonstrated by pulse-chase experiments. It was concluded that the mesophyll apoplast in pea has a relatively low capacitance as an ion reservoir. Apoplastic K(+) content was found to be highly sensitive to changes in xylem solution concentration.

Quantification of Apoplastic Potassium Content by Elution Analysis of Leaf Lamina Tissue from Pea (Pisum sativum L. cv Argenteum)