Summary
Research carried out into successively older sunflower leaves has allowed us to follow the different ontogenetic stages leading to the building up of a well-differentiated chloroplast. In all the intrathylakoid compartments of the young plastids there is very electron-dense material whose accumulation causes the dilatation of some thylakoid profiles and, consequently, the forming of roundish bodies. The thylakoid membranes appear as “Lithtly Stained Membranes” which, according to the most recent interpretation, are considered as incompletely organized ones. At a subsequent stage there is an increase of the thylakoid membrane staining along with a decrease of the electron-density of the intrathylakoid compartments that, at the end of the ontogenetic process, appear electrontransparent and flattened. Therefore, the intrathylakoid material appears to have been used up in the forming of well-organized membranes. This particular situation, present in the early ontogenetic stages of the plastids, may be attributed to an initial disequilibrium between the synthesis speed of membranal material and the capability to build up well-organized membranes.
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References
Blackwell, S. J., Laetsch, W. M., Hyde, B. B., 1969: Development of chloroplast fine structure in aspen tissue culture. Amer. J. Bot.56, 457–463.
Casadoro, G., Rascio, N., Paganelli Cappelletti, E. M., 1977: Membrane-bound plastidial inclusions in belladonna (Atropa belladonna L.). Biol. Cellulaire29, 61–66.
- - 1978: Thylakoid membranes in sunflower and in other plants. J. Ultrastruct. Res. (in press).
Catesson, A. M., 1970: Evolution des plastes de pomme au cours de la maturation du fruit. Modifications ultrastructurales et accumulation de ferritine. J. Microscopie9, 949–974.
Cran, D. G., Possingham, J. V., 1974: Plastid thylakoid formation. Ann. Bot.38, 843–847.
Damsz, B., Mikulska, E., 1976: Ontogenesis of photosynthetic membranes in the plastids ofCattleya sp. leaves grown in the light. Biochem. Physiol. Pflanzen169, 257–263.
Israel, H. W., Steward, F. C., 1967: The fine structure and development of plastids in cultured cells ofDaucus carota. Ann. Bot.31, 1–18.
Marty, D., 1973: Aspects particuliers de l'ontogenèse des thylacoides dans les feuilles panachées deColeus blumei Benth. C. R. Acad. Sci. (Paris)277, 45–48.
Platt-Aloia, K. A., Thomson, W. W., 1977: Chloroplast development in young sesame plants. New Phytol.78, 599–605.
Salema, R., Abreu, I., 1972: Development of photosynthetic lamellae inPhyllanthus nivosus Bull. Broteria41, 1–18.
—,Mesquita, J. F., Abreu, I., 1972: Particular aspects of the construction of photosynthetic membranes. J. Submicrosc. Cytol.4, 161–169.
Srivastava, L. M., Paulson, R. E., 1969: The fine structure of the embryo ofLactuca sativa. II. Changes during germination. Canad. J. Bot.46, 1447–1453.
Stetler, D. A., Laetsch, W. M., 1969: Chloroplast development inNicotiana tabacum “Maryland mammoth”. Amer. J. Bot.56, 260–270.
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Casadoro, G., Rascio, N. Chloroplast ontogenesis inHelianthus annuus L. . Protoplasma 97, 165–172 (1978). https://doi.org/10.1007/BF01276691
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DOI: https://doi.org/10.1007/BF01276691