The four elements of phloem are Sieve tubes, Companion cells, phloem fibers, phloem parenchyma. Sieve tube elements: Like each vessel, sieve tubes are also made up of many cells called sieve tube elements and sieve tube members. - Sieve tube elements are the long, tube-like structures that are arranged longitudinally. These are thin-walled living structures having cellulosic cell walls. - A mature sieve tube element possesses a mature cytoplasm and a large central vacuole but lacks a nucleus.
Companion cells: These are the specialized parenchymatous cells that are closely associated with sieve tube elements due to which they are called the companion cells.
Phloem fibers: They are also called blast fibers. These are sclerenchymatous, elongated, unbranched fibers.
Phloem parenchyma: It is composed of living parenchymatous cells. These are the elongated cells that have tapering cells.
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The four elements of phloem are Sieve tubes, Companion cells, phloem fibers, phloem parenchyma. Sieve tube elements: Like each vessel, sieve tubes are also made up of many cells called sieve tube elements and sieve tube members. - Sieve tube elements are the long, tube-like structures that are arranged longitudinally. These are thin-walled living structures having cellulosic cell walls. - A mature sieve tube element possesses a mature cytoplasm and a large central vacuole but lacks a nucleus.
Companion cells: These are the specialized parenchymatous cells that are closely associated with sieve tube elements due to which they are called the companion cells.
Phloem fibers: They are also called blast fibers. These are sclerenchymatous, elongated, unbranched fibers.
Phloem parenchyma: It is composed of living parenchymatous cells. These are the elongated cells that have tapering cells.
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