Introductory Crop Physiology

Direction of Translocation

• The movement of organic solutes takes place in all directions, It may also occur downward or upward or radially.
• The food materials synthesized in the leaves move downwards to the stems and roots.
• The upward and downward translocation takes place through the phloem.
• The upward movement of food materials occurs from the leaves to the buds, growing leaves, flowers, fruits and seeds.
• During the germination of seeds, the stored food is supplied to the growing seedlings, through upward translocation.
• Radial translocation is the lateral movement of organic solutes.
• It occurs from the cells of pith to the cells of cortex and epidermis.
• The radial translocation occurs through the medullary rays.