Mitocondri Aggregati in<i>Psilotum Nudum</i>(L.) Beauv.

Fabbri, Fernando; Palandri, Mariarosa

doi:10.1080/00087114.1970.10796384

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…[ = Psilotum triquetrum Sw.J (Pteridhophytes) (FABBRI and PALANDRI 1970;BALMEFREZOL and ANDRE 1970;BARCKAUS and PEVELING 1971). In such case, however, the observed structures were much irregularly shaped, resulting from association of generally elongated and lobate mitochondria, often wrapped together.…”

Section: Introductionmentioning

confidence: 99%

Unusual Mitochondrial Aggregates in Companion Cells ofAristolochia ClusiiLojacono

Bonzi

1985

Caryologia

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Section: Introductionmentioning

confidence: 99%

Unusual Mitochondrial Aggregates in Companion Cells ofAristolochia ClusiiLojacono

Bonzi

1985

Caryologia

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Structure and Development of the Sieve Elements in Psilotum Nudum

Perry

Evert

1975

American J of Botany

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Shoot tissue of Psilotum nudum (L.) Griseb. was fixed in glutaraldehyde and postfixed in osmium tetroxide for electron microscopy. Young sieve elements can be distinguished from contiguous parenchyma cells by their distinctive plastids, the presence of refractive spherules, and the overall dense appearance of their protoplast. The refractive spherules apparently originate in the intracisternal spaces of the endoplasmic reticulum (ER). With increasing age the sieve‐element wall undergoes a marked increase in thickness. Concomitantly, a marked increase occurs in the production of dictyosome vesicles, many of which can be seen in varying degrees of fusion with the plasmalemma. Other fibril‐ and vesicle‐containing vacuoles also are found in the cytoplasm. In many instances the delimiting membrane of these vacuoles was continuous with the plasmalemma. Vesicles and fibrillar materials similar to those of the vacuoles were found in the younger portions of the wall. At maturity the plasmalemma‐lined sieve element contains a parietal network of ER, plastids, mitochondria, and remnants of nuclei. The protoplasts of contiguous sieve elements are connected by solitary pores on lateral walls and pores aggregated into sieve areas on end walls. All pores are lined by the plasmalemma and filled with numerous ER membranes which arise selectively at developing pore sites, independently of the ER elsewhere in the cell. P‐protein and callose are lacking at all stages of development.

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Intermitochondrial junctions in the heart of the frog, Rana esculenta

1985

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In muscle fibers of the frog heart, junctions between outer membranes of adjacent mitochondrial profiles are occasionally found. In thin sections of embedded tissue and of mitochondrial pellets, the intermitochondrial junctional space is 5.4 +/- 0.15 nm; the external leaflets of the membranes are joined by periodic structures separated from each other by 16.3 +/- 0.29 nm. There are 65.3 +/- 2 periodic structures per micron of membrane measured on a section perpendicular to the junction. After cryofracture, the outer membrane is cleaved into two parts. Closely packed, parallel rows of large particles and furrows are found either on the P-, or on the E-faces. The rows of particles are 11 +/- 0.3 nm thick and are separated from each other by 16.5 +/- 0.46 nm, their density being 65 +/- 2.28 per micron of the membrane. In junctional areas, rows of particles on one membrane correspond with the furrows on the other membrane. Intermitochondrial junctions appear to be real structures and not artifacts due to preparation procedures. The conditions of their occurrence are discussed.

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Mitocondri Aggregati inPsilotum Nudum(L.) Beauv.

Cited by 3 publications

References 6 publications

Unusual Mitochondrial Aggregates in Companion Cells ofAristolochia ClusiiLojacono

Unusual Mitochondrial Aggregates in Companion Cells ofAristolochia ClusiiLojacono

Structure and Development of the Sieve Elements in Psilotum Nudum

Intermitochondrial junctions in the heart of the frog, Rana esculenta

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