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plasmodesmata

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cell junction

Overview page. Subjects: Biological Sciences — Chemistry.

Any of various kinds of connection between cells. Tight junctions form a seal between adjacent cells, particularly in epithelia, to prevent the passage of materials between cells. A...

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companion cell

Overview page. Subjects: Plant Sciences and Forestry.

Modified parenchyma, linked to sieve cells by plasmodesmata. Unlike sieve cells, companion cells are nucleated and have many mitochondria. Companion cells may regulate translocation.

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heterocyst

Overview page. Subjects: Biological Sciences — Chemistry.

A specialized cell found in nitrogen-fixing cyanobacteria. Heterocysts are enlarged cells with thick cell walls and they lack chlorophyll, giving them a colourless appearance. They are the...

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phloem loading

Overview page. Subjects: Biological Sciences.

The processes by which the products of photosynthesis enter the phloem for transport to other tissues within the plant. The carbon fixed by photosynthesis is transported in phloem primarily...

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pit

Overview page. Subjects: Plant Sciences and Forestry.

A region in a cell wall where the primary wall is not overlaid by secondary thickening, through which substances can be exchanged between adjacent cells. The pit consists of a cavity, which...

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symplast

Overview page. Subjects: Plant Sciences and Forestry.

The continuum of cytoplasm through a plant that results from the cytoplasm in different cells being connected by plasmodesmata, forming an important pathway, e.g. for auxins.

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transfer cell

Overview page. Subjects: Plant Sciences and Forestry.

A type of cell found in higher plants, with a great abundance of protuberances in its wall and many plasmodesmata, which enhance solute movements. These cells are found in association with...

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