A Cytochemical Investigation of a Chloroplast Inclusion

Ames, Ira H.; Pivorun, Joan P.

doi:10.2307/2441796

Cited by 20 publications

(2 citation statements)

References 15 publications

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“…(Norstog, personal communication), as well as in plastids of many angiosperms. These membranebound bodies commonly contain protein (Ames & Pivorun, 1974), though this has only been analysed in detail in spinach where the protein was found to consist primarily of ribulose-bis-phosphate carboxylase (Sprey & Lambert, 1977). The single limiting membrane of these bodies is thought to represent one margin of a thylakoid, indicating that the protein lies within the intra-thylakoid space and hence cut off from the plastid stroma.…”

Section: Discussionmentioning

confidence: 99%

Chromoplasts in Some Cycads

Whatley¹

1985

New Phytologist

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SUMMARYThe ripe seeds of some species of cycads are red in colour and contain chromoplasts: those in seeds of Cycas revoluta Thurb. and Macrozamia lucida L. A. S. Johnson belong to the tubulous class of chromoplast whereas those of Zamia purpurea sp.nov. contain large globules, some packed thylakoids linked by electron-dense bridges, and other unusual structures. The Zamia plastids do not fall clearly into any of the generally recognized chromoplast categories. Some features of the chromoplasts of cycads closely resemble those found in angiosperms; other features appear more typical of plastids in lower plants.

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Section: Discussionmentioning

confidence: 99%

Chromoplasts in Some Cycads

Whatley¹

1985

New Phytologist

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“…The chemical composition of membrane-bound plastid inclusions appears to vary or is incompletely known among plant species. Their main component has been interpreted as protein (Ames and Pivorun, 1974;Hoefert and Esau, 1975), nucleoprotein (Marinos, 1967), lipid (Gif-ford and Steward, 1968), lipoprotein (Cran and Possingham, 1974) or phenolics (Flemion et al, 1967).…”

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confidence: 99%

Plastids in Laticifers of Papaver. I. Development and Cytochemistry of Laticifer Plastids in P. Somniferum L. (Papaveraceae)

Nessler

Mahlberg

1979

American J of Botany

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Plastids were observed in all stages of laticifer differentiation in Papaver somniferum L. Plastids in laticifer initials were present as proplastids that later developed electron‐dense inclusions, but never possessed the thylakoids or starch grains that characterize chloroplasts in other cells. Electron‐dense inclusions in laticifer plastids were membrane‐bound and appeared to arise from the accumulation of material within an invagination of the inner plastid membrane. Cytochemical studies of these plastid inclusions indicated that their matrix was not composed of crystalline protein, α‐amylose, amylopectin or polysaccharide. The results suggest that the electron‐dense, membrane‐bound inclusions in laticifer plastids may be composed of lipoprotein.

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Ultrastructure of the Shoot Apex of Tomato (Lycopersicon Esculentum)

Sekhar

Sawhney

1985

American J of Botany

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The vegetative shoot apical meristem of tomato (Lycopersicon esculentum Mill.) was examined at the ultrastructural level. The meristem consisted of a surface layer that was different from the rest of the meristem and was unique among the dicotyledonous species. The cells of the surface layer contained large distal vacuoles with relatively large electron‐dense inclusions, proplastids with membrane‐bound inclusions (MB), and differentiating chloroplasts. In addition, periclinal and oblique divisions were observed in the surface layer cells along with anticlinal divisions. The cells of the subsurface layers contained small vacuoles with fewer inclusions as well as proplastids of various shapes but without MB. Differentiating chloroplasts were not observed in these cells, but autophagic vacuoles at various stages of development were present. The normal complement of cell inclusions, e.g., the mitochondria, golgi bodies, endoplasmic reticulum (ER), ribosomes, and microtubules were observed in subsurface layers, and in many cells the ER was observed to be continuous with the outer membrane of the nuclear envelope and with the plasmalemma. Further below in the meristem, cells contained both the proplastids and differentiating chloroplasts with MB. In the latter, the outer membrane of the MB was found to be continuous with the developing lamellae, suggesting that MB probably serve as the storage centers for lamellae membranes. Near the base of the meristem, in the pith‐rib meristem, enlarged cells containing large vacuoles and differentiated chloroplasts were present.

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A Cytochemical Investigation of a Chloroplast Inclusion

Cited by 20 publications

References 15 publications

Chromoplasts in Some Cycads

Chromoplasts in Some Cycads

Plastids in Laticifers of Papaver. I. Development and Cytochemistry of Laticifer Plastids in P. Somniferum L. (Papaveraceae)

Ultrastructure of the Shoot Apex of Tomato (Lycopersicon Esculentum)

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