Question: How sucrose is transported in plant cells? Edit
Answer: Transportation in plants takes place on 3 levels - 1) absorption of minerals and water from the soil by root cells, 2) short distance transportation of substances from cell to cell; this process involves loading of sucrose (sugar) from the photosynthetic cells into sieve tube cells of the phloem tissue, and 3) long distance transportation of the sap within both xylem and phloem.
Phloem transportation is bidirectional; it moves from a sucrose source where the sucrose is produced by photosynthesis or by breaking down on sugars to a sugar sink that absorbs or stores sugar or sucrose.
Sugar produced in the mesophyll cells of the leaves travel through the symplast to the sieve tube members. It is loaded into phloem through chemiosmotic ATPas mechanism along with a H+/sucrose symport. It can be also uploaded with an H+ or sucrose pump. And,it should be unloaded using the same pump . Edit
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