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Phloem
The downward conducting tissues in the leaves, stems and roots are called phloem. Such tissues are composed of sieve tubes, companion, fibre and parenchyma cells. The sieve tubes are the important conducting cells of the phloem. They are composed of vertically elongated rows of cylindrical cells, which have their end walls perforated. When they are living, these cells contain cytoplasm. The sieve cells are surrounded with companion cells which strengthen and help the sieve cells in their conduction of synthesised foods. The fibre cells are long thick-walled strengthening cells. The parenchyma cells of the phloem tissue are storage cells.
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- Part of Speech: noun
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- Industry/Domain: Plants
- Category: Horticulture
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