Careful cutting of the hypocotyl of Ricinus communis L. seedlings led to the exudation of pure sieve-tube sap for 2—3 h. This offered the possibility of testing the phloem-loading system qualitatively ...

Journal of Experimental Botany, Vol. 47, No. 300 (JULY 1996), pp. 863-870 (8 pages) To investigate the factors governing the accumulation of sucrose and amino acids in the taproots of sugar beet, ...

While the movement of water through xylem tissue is relatively well understood, the movement of solute-laden sap through phloem is not. One possibility is the ‘pressure flow hypothesis’ proposed by ...

Phloem diseases, including the economically devastating citrus greening, are particularly difficult to study because phloem cells -- essential for plant nutrient transport -- are difficult to access ...

These are distributed differently in roots and stems. In the root, the xylem forms a central column. It forms a solid support. The phloem is towards the centre, outside the xylem. Any green part of a ...