Increase of membrane permeability of mitochondria isolated from water stress adapted potato cells

In order to gain some insight into mitochondria permeability under water st ress, intact coupled mitochondria were isolated from water stress adapted p otato cells and investigations were made of certain transport processes inc luding the succinate/malate and ADP/ATP exchanges, the plant mitochondrial ATP-sensitive potassium channel (PmitoK(ATP)) and the plant uncoupling mito chondrial protein (PUMP). The V-max values measured for succinate/malate an d ADP/ATP carriers, as photometrically investigated, as well as the same va lues for the PmitoK(ATP) and the PUMP were found to increase; this suggeste d that mitochondria adaptation to water stress can cause an increase in the membrane permeability.