1 Introduction. - 2 Solute transport at the cellular level. - 2. 1 Driving forces. - 2. 2 Carriers and pumps. - 2. 3 Energy sources for active transport. - 2. 4 Sensitive cells. - 3 Symplast and apoplast. - 3. 1 The parallel pathways. - 3. 2 Radial barriers the endodermis. - 3. 3 Transfer cells. - 4 The xylem pathway. - 4. 1 Xylem structure. - 4. 2 Ion movement in the xylem. - 4. 3 Regulation of leaf nutrient content. - 5 The phloem pathway. - 5. 1 Experiments to determine the pathway of assimilate translocation. - 5. 2 Structural design of the sieve element. - 5. 3 Composition of phloem sap. - 5. 4 Movement in the phloem. - 5. 5 Physiology of the phloem. - 6 Driving forces for long-distance transport. - 6. 1 Transpiration and the cohesion theory. - 6. 2 Postulated mechanisms for phloem transport. - References. Language: English