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- Companion cells form a functional unit with the sieve elements for long-distance translocation of assimilates, nutrients and signalling molecules and play indispensable roles throughout the life cycle of plants.
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What is a companion cell in a plant phloem?
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What are companion cells & sieve elements?
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Nov 3, 2016 · Vascular plants have developed highly specialized cells to transport nutrients and developmental signals. The differentiation process includes the degradation of multiple organelles of the sieve element cells (SEs) to facilitate transport and, as a consequence, SEs become dependent on neighboring companion cells (CCs).
- Sofia Otero, Ykä Helariutta, Ykä Helariutta
- 2017
Aug 4, 2015 · Companion cells are parenchymal cells found within the phloem of flowering plants that manage the flow of nutrients through sieve tubes. Companion cells deliver ATP, proteins and other nutrients to sieve elements.
The assimilate, which is rich in sucrose, is actively transported from source cells into companion cells and then into the sieve-tube elements. This reduces the water potential, which causes water to enter the phloem from the xylem.
Mar 30, 2023 · Companion cells form a functional unit with the sieve elements for long-distance translocation of assimilates, nutrients and signalling molecules and play indispensable roles throughout the life cycle of plants.
Abstract. Vascular plants have developed highly specialized cells to transport nutrients and developmental signals. The differentiation process includes the degradation of multiple organelles of the sieve element cells (SEs) to facilitate transport and, as a consequence, SEs become dependent on neighboring companion cells (CCs).
Jul 11, 2023 · 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.
Jul 31, 2022 · Companion cells are associated with STEs. They assist with metabolic activities and produce energy for the STEs (Figure 3a). Once in the phloem, the photosynthates are translocated to the closest sink.
