The site of photosynthesis where the formation of photosynthates occurs is called the source and the site of translocation or the site where the food is delivered is called the sink. The photosynthates are translocated to all the parts of the plant depending on the need. For instance, photosynthates are translocated to root during its early development; translocated to shoot and leaves during their vegetative phase and growth; and translocated to the seeds and fruits during their reproductive phase of development. The photosynthates are synthesized in the mesophyll cells of the leaves and they are translocated through the phloem, transported to the sieve tube elements, and then translocated to the nearest sink. If the concentration of the sucrose is high in the phloem sap then, it causes the water to move from xylem to phloem. This leads to the increase of water pressure in the phloem and eases the phloem sap to travel from source to sink. The translocation of photosynthates always occurs to the nearest sink by the phloem. For example, the photosynthates synthesized in the upper leaves travel upward, towards the active shoot and the photosynthates synthesized in the lower leaves travel downwards, towards the root. The intermediate leaves send the photosynthates in both directions.
Transport from source to sink:
The transportation of the water is unidirectional but the transportation of the phloem is bidirectional and travels in different ways. The translocation will occur with due necessity. For example, during the mid-growing season, the leaves and stems where photosynthesis is occurring will serve as the sources. These produce excessive sugars to the sinks where there is a necessity for the sugars. The sinks in the growing seasons include the growing meristems, newly formed leaves, and reproductive structures. The sinks include storage organs like roots, bulbs, or tubers. The leaves wither and no longer photosynthesis will occur during the end stage of the growing season. During the start of the growing season, since the plant is in dormancy to grow new leaves for photosynthesis, the storage sites will act as the sources and the growing sites will become the sinks. When the leaves are grown, they will serve as the sources.
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