Hartig was the first to discover and name the sieve tube element cells ( as " Siebfasern "-sieve fibres and " Siebr�hren "-sieve tubes ) in 1837.
22.
Hartig was the first to discover and name the sieve tube element cells ( as " Siebfasern "-sieve fibres and " Siebr�hren "-sieve tubes ) in 1837.
23.
The pathogen, sandal spike phytoplasma, was first detected by electron microscopy in 1969 . Phytoplasmas are pleomorphic and fragile organisms occupying relatively small areas within the sieve tubes ( phloem ) of the host plants.
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In plant anatomy, "'sieve tube elements "', also called "'sieve tube members "', are a specialised type of elongated cell in the phloem tissue of flowering plants.
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In plant anatomy, "'sieve tube elements "', also called "'sieve tube members "', are a specialised type of elongated cell in the phloem tissue of flowering plants.
26.
Vascular tissues are used to move hormones from one part of the plant to another; these include sieve tubes or phloem that move sugars from the leaves to the roots and flowers, and xylem that moves water and mineral solutes from the roots to the foliage.
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Forisomes function as valves in sieve tubes of the phloem system, by reversibly changing shape between low-volume ordered crystalloid spindles and high-volume disordered spherical Ca 2 + changes provoked by Ca 2 +-permeable ion channels, located on the endoplasmic reticulum and plasma membrane of sieve elements.
28.
"' Sieve cells "'are long, slender, conducting cells of the phloem that do not form a constituent element of a sieve tube, but which are provided with relatively unspecialized sieve areas, especially in the tapering ends of the cells that overlap those of other sieve cells.
29.
The core Caryophyllineae sub-order is well-supported with numerous distinctive synapomorphies, such as : 1 ) sieve tubes of phloem with plastids with peripheral ring of proteinaceous filaments ( often with a central protein crystal ), 2 ) presence of betalains, 3 ) loss of the rpl2 intron in cpDNA, 4 ) single whorl of tepals, 5 ) pollen with spinulose and tubiliferous / punctuate exine, 6 ) placentation free-central to basal, curved embryo, and 7 ) presence of perisperm with endosperm scanty or lacking
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