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This page explains that phloem transports organic substances in plants, aided by companion cells, with rates up to 110 μm per second. Girdling removes phloem , starving roots. The pressure-flow … Phloem is the vascular tissue in charge of transport and distribution of the organic nutrients. The phloem is also a pathway to signaling molecules and has a structural function in the plant body. It is typically composed of three cell types: sieve elements, parenchyma, and sclerenchyma. The sieve elements have the main function of transport and typically have lost their nuclei and other organelles in the course of their specialization. Hence, the sieve elements rely on specialized ... Function and Structure of Phloem Phloem transports organic nutrients, particularly sugars synthesized during photosynthesis, from the leaves to all other cells of the plant, including the roots. Phloem tissue is composed of sieve-tube elements, companion cells, phloem fibers, and phloem parenchyma. Phloem fibers are long, flexible cells that make up the soft fibers used in commerce (such as flax and hemp). Phloem is the biological tissue of vascular plants that transports photosynthesis, a soluble organic compound produced during photosynthesis, to various regions of the plant.
