An Unusual Organelle in the Peripheral Cytoplasm of Chara Cells

Barton, R.

doi:10.1038/205201a0

Cited by 53 publications

(21 citation statements)

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“…In the gamete cells, some inclusions almost certainly represent storage organelles; this also seems likely in the vegetative cells. Crawley (1965) and Barton (1965) have reported the occurrence of a mass of interconnected tubules in a sack of membranes, near the wall; similar structures have been seen in the course of the investigations described above (Fig. 13), and also in the cytoplasm of many cells in the wheat seedling.…”

Section: Discussionmentioning

confidence: 60%

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Ultrastructure and Differentiation in Chara Sp.I. Vegetative Cells

Pickett‐Heaps¹

1967

Aust. Jnl. Of Bio. Sci.

114

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SummaryThe ultrastructure of young growing cells of Ohara is described. The cells showed many features typical of plant cells. The nuclei of larger cells invariably contained groups of close·packed, heavily staining microtubular elements. Typical wall microtubules were always found, and large internodal cells contained filaments possibly involved in cytoplasmic streaming. Vacuolation in young internodes apparently commenced by extensive dilation of elements of the endoplasmic reticulum. In other cells, close apposition of endoplasmic reticulum to cytoplasmic inclusions indicated possible secretion of material into the organelles had been occurring. Golgi bodies with intercisternal elements were often grouped together, sometimes with interconnected cisternae. Isolated reticulate membrane systems, similar to those found at the reticulate face of golgi bodies, were sometimes seen in vacuolated cells. The golgi bodies might have been involved in vacuolation; they were also seen in association with coated vesicles that appeared to be involved in wall deposition. A large number of different cytoplasmic inclusions were found, whose nature and function is obscure. These sometimes contained crystal.like bodies.The results are discussed in terms of the possible functions of the organelles, particularly with respect to morphogenesis and the patterns of cells formed during growth.

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Section: Discussionmentioning

confidence: 60%

“…A membranous inclusion (m) very near the wall is also shown (cf. Crawley 1965;Barton 1965). Figure 15; the chloroplasts (ch) in older cells generally contained prominent starch grains (8t).…”

Section: Explanation Of Plates 1-9mentioning

confidence: 99%

Ultrastructure and Differentiation in Chara Sp.I. Vegetative Cells

Pickett‐Heaps¹

1967

Aust. Jnl. Of Bio. Sci.

114

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“…However, in contrast to the plasmalemma formations of the host, polysaccharide fibrils were not commonly attached to those of the fungus or in the spaces between them (Fig. 3) Although a few authors have suggested that the membrane formations associated with the plasmalemma and generally referred to as plasmalemmasomes (Marchant andRobards 1968, Marchant andMoor 1973), may be artefacts of electron micro scopy fixation procedures (Fowke and Setterfield 1969, O'Brien 1967, Mersey and McCully 1978, convincing evidence that they really do exist has been obtained in very many studies using different fixation techniques and a wide range of organisms including algae, bryophytes, fungi, higher plants and host-pathogen interfaces (see for example: Arigoni and Rossi 1963, Peyton and Bower 1963, Barton 1965, Mar chant et al 1967, Scannerini 1967, Marchant and Robards 1968, Lehmann and Schultz 1969, Cole and Lin 1970, Edwards and Allen 1970, Mesquita 1970, Coulomb 1973, Marchant and Moor 1973, Eyme and Parriaud 1970, Eyme and Angeli-Papa 1978.…”

Section: Resultsmentioning

confidence: 99%

Ultracytological studies of plasmalemma formations produced by host and fungus in vesicular-arbuscular mycorrhizae.

et al. 1985

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“…Their orientation appeared to be roughly in the transverse direction. Pictures of somewhat related structures near the cell wall of characeous cells have been published by Crawley (1965) and Barton (1965).…”

Section: (A) Internode Elongationmentioning

confidence: 99%

A Mechanism for the Origin of Specifically Oriented Textures in Development with Special Reference to Nitella Wall Texture

Pb¹,

King²

1966

Aust. Jnl. Of Bio. Sci.

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SummaryMany oriented growth phenomena, including the elongation of the Nitella internode, are based upon oriented or textured cell wall structure. In many cases the ordered textures are not present in the earliest stages of cell development but appear later. In Nitella lateral cell (leaf) development the first appearance of transverse wall texture (detected in polarized light) approximately coincides with a transverse stretching of the cell and its wall. This oriented stretching appears not to have its origin in a pre-existing texture but rather to be the result of a particular distribution of wall expansion rates. The relation between rates and oriented distortions is studied as a general phenomenon. The form these rate variations must take to provide longitudinal, transverse, or isotropic distortion is derived. Model devices made of rubber membranes, where expansion rate is varied by reinforcement of the rubber, generate distortions (textures in the rubber) of the type predicted. In the course of development it is possible that imbalances in expansion rate based on gradients (of metabolites, pH, light, etc.) bring on, through strain orientation, the initial alignment of originally randomly oriented fibrous ultrastructures, such as microfibrils of the cell wall or cytoplasmic microtubules.

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An Unusual Organelle in the Peripheral Cytoplasm of Chara Cells

Cited by 53 publications

References 1 publication

Ultrastructure and Differentiation in Chara Sp.I. Vegetative Cells

Ultrastructure and Differentiation in Chara Sp.I. Vegetative Cells

Ultracytological studies of plasmalemma formations produced by host and fungus in vesicular-arbuscular mycorrhizae.

A Mechanism for the Origin of Specifically Oriented Textures in Development with Special Reference to Nitella Wall Texture

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