The movement of solutes through the plant tissues can take place in two pathways, the one is cytoplasmic pathway and the other is cell wall pathway. Solute movement may occur through channels in the cell walls and is, therefore, extracellular. In this way it bypasses the protoplasts and overcomes the barriers in the cross membranes. In this process the solutes [...]
Early workers believed that inorganic salts were passively carried into the plant through diffusion with the absorption of water and further assumed that the translocation of the absorbed salts to different parts of the plant was dependent on transpiration. It is known that certain ions may attain a higher concentration in the cell sap of plant tissues than in the [...]
There are many intrinsic membrane ATPases, which can transport ions in one direction across a membrane without being accompanied by an ion of opposite charge giving rise to an electrical potential difference. These intrinsic membrane proteins were variously named as translocases, transferases or penetrases. They depend on ATP as energy source for transport. The allosteric transition of the transport ATPases [...]