Special Cytology: Cytology and Morphogenesis of Higher Plant Cells — Phloem

Behnke, H.–Dietmar

doi:10.1007/978-3-642-69445-5_2

Cited by 1 publication

(5 citation statements)

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“…29; compare witb Figs 30, 32). At tbis stage the a-SE closely resembles the well known differentiated stage of a normal sieve tube element (for reviews see Esau, 1969;Behnke, 1983;Evert, 1984).…”

Section: Advanced Stages Of A-se Differentiation-autolysismentioning

confidence: 77%

“…Only some of these exhibit occasional local wall tbickenings comparable to those of a-SEs. The a-SE observed here has all the protoplasmic characteristics of the normal sieve-tube element and initially undergoes apparently normal selective autopliagy (for reviews on the typical structure of the normal sieve elements see Cronshaw, 1981;Behnke, 1983;Evert, 1984). However, its shape is variable, differing completely from that of the sieve tube-elements.…”

Section: Cell Wall Differentiation In A-sieve Elementsmentioning

confidence: 85%

“…In a-SEs, either their autolysis programme is modified and they produce quantities of wall degrading lysosomal enzymes, or the protective mechanism of the wall does not work. As in normal sieve-tube members (Behnke, 1983;Evert, 1984) the ER seems to play an essential role in a-SE autolysis. In the latter cell type, ER membranes appear involved in wall autolysis, invading the space between the degrading thickenings.…”

Section: Autolysis Of A-sieve Elementsmentioning

confidence: 93%

“…This is particularly true of \ascular tissues, in which wall differentiation is directly related to the specific functions of the mature cell types. In both tracheary and sie\'e elements, the cortical microtubule cytoskeleton appears to be involved in the patterning of the deposition of wall thickenings and cellulose microfibril orientation (for reviews see Hepler, 1981;Gunning & Hardham, 1982;Behnke, 1983;Evert, 1984). In differentiating tracheary elements the experimental destruction of cortical microtubules results in extensive malformation of the emerging secondary wall thickenings (Pickett-Heaps, 1967;Hepler & Fosket, 1971;Hardham & Gunning, 1980).…”

Section: Introductionmentioning

confidence: 99%

“…(6) Tbe walls produced in the presence of colchieine would be patterned. Sieve-tube elements in angiosperms secrete a distinct type of primary wall, in the presence of a dense array of transversely aligned microtubules in tbe cortical cytoplasm (Tborsch & Esau, 1982;Behnke, 1983;Evert, 1984;Eleftberiou, 1987; see also Hardham & Gunning, 1979). (c) Vascular bundles would be initiated in the presence of colcbicine.…”

Section: Introductionmentioning

confidence: 99%

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Aberrant sieve element differentiation in primary leaves of Vigna sinensis Endl. affected by colchicine

Galatis

1991

New Phytologist

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SUMMARYIn primary leaves of Vigna sinensis Endl. seedlings growing in the presence of colchicine, some giant polyploid cells at the phloem pole of the vascular bundles differentiate into an extraordinary cell type acquiring most of the prominent features of the sieve elements. These aberrant sieve elements (n-SEs) show some exceptional features not found in normal sieve-tube elements. A heavy secondary thickening is deposited on their walls, which in surface view exhibits a reticulate or 'pitted' appearance. The thickenings reaeh the same depth into the cytoplasm and show a diffuse orientation of cellulose microfibrils. Amorphous callose is deposited around some fine cytoplasmic strands penetrating the secondary wall up to the primary one along the longitudinal and particularly the transverse walls. In the latter walls sieve pores are not formed. At first, the a-SEs undergo a partial protoplasmic degradation like normal sieve-tube elements but finally autolyse completely. During this process, the major portion of the unmasked primary and secondary wall is dissolved.The observations show that {a) a vascular bundle initiation and development proceeds in the affected primary leaves, in the absence of cell divisions. 'Vascular bundles' are formed consisting of a single row of cells, in which a-SE differentiation dominates. (6) The 'sieve element differentiation' is initiated without differential divisions, (t) Although the microtubules are absent, the cells determined to become a-SEs acti\'ate another morphogenetic mechanism to control a more or less patterned deposition of a secondary wall layer.

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Section: Advanced Stages Of A-se Differentiation-autolysismentioning

confidence: 77%

Section: Cell Wall Differentiation In A-sieve Elementsmentioning

confidence: 85%

Section: Autolysis Of A-sieve Elementsmentioning

confidence: 93%