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Living nucleated cell
- companion cell noun : a living nucleated cell that is closely associated in origin, position, and probably function with a cell making up part of a sieve tube of a vascular plant
www.merriam-webster.com/dictionary/companion cell
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The meaning of COMPANION CELL is a living nucleated cell that is closely associated in origin, position, and probably function with a cell making up part of a sieve tube of a vascular plant.
- What Are Sieve Tubes
- What Are Companion Cells
- Similarities Between Sieve Tubes and Companion Cells
- Difference Between Sieve Tubes and Companion Cells
Sieve tubes are the most advanced type of sieve cells that only occur in the phloem of angiosperms. They are made up of a series of sieve tube elements arranged end to end in a longitudinal manner, forming a tube. Moreover, the end walls of the sieve tube elements are horizontal and broad. They contain sieve plates with pores whose size can be cont...
Companion cells are the cells associated with the sieve tube elements. Unlike sieve tubes, companion cells contain a nucleus and a higher number of ribosomes and mitochondria. Therefore, these cells are responsible for the regulation of the functions of sieve elements. Generally, companion cells are connected to the sieve tubes through plasmodesmat...
Sieve tubes and companion cells are two types of cell found in the phloem of angiosperms.Their main function is to transport food throughout the plant.Also, both originate from the meristem, and the epigenetic factors drive their differentiation.They form the sieve element-companion cell complex.Definition
Sieve tubes refer to a series of sieve tube elements placed end to end to form a continuous tube while companion cells refer to a specialized parenchyma cell, located in the phloem of flowering plants and closely associated in development and function with a sieve-tube element. Thus, this is the main difference between sieve tubes and companion cells.
Size
Another difference between sieve tubes and companion cells is their size. Sieve tubes are large cells while companion cells are small cells.
Sieve Plates
Moreover, sieve tubes contain sieve plates while companion cells do not contain sieve plates.
A specialized parenchyma cell, located in the phloem of flowering plants and closely associated with the development and function of a sieve-tube element. Companion cells probably provide ATP, proteins, and other substances to the sieve-tube elements, whose cytoplasm lacks many structures necessary for cell maintenance.
Nov 21, 2023 · The function of companion cells is to support sieve elements by carrying out cell metabolism and regulation. Companion cells have a dense cytoplasm with abundant organelles,...
Sieve-tube elements have reduced cytoplasmic contents and rely on special parenchyma cells called companion cells, which assist with metabolic activities and provide energy (Figure \(\PageIndex{2}\)).
Definition. Companion cells are specialized parenchyma cells found in the phloem of flowering plants. They play a crucial role in the transport of photosynthates (sugars) from source tissues to sink tissues.
…specialized parenchyma cell called a companion cell. They are derived by mitosis from the same parent cell and remain connected with each other. Photosynthates are actively secreted into, and actively removed from, sieve-tube members by their companion cells.
