. La cytologie. La cytologie. Des plastes avec l'on fait exception de la plus faible des groupes de plantes, les plastes sont présents dans les cellules de la plupart des tissus des membres du règne végétal. Les plastes varient en taille, nombre, forme, et chimique avec le tissu de l'organisation et de l'organisme concerné. Les plastes "mature" peut être indiqué de se poser de plus ou moins les primordia des plastes indifférenciés qui se produisent. La figure 3-14. Micrographe de Section du Photosynthctic Rlwdospirilluin Bac- terium, nihriini. Remarque Le photosynthctic (particules discrètes chromatophores) pack qui l'ensemble du cytoplasme

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. Cytology. Cytology. PLASTIDS With the possible exception of the very lowest groups of plants, plastids are found in the cells of most tissues of members of the plant kingdom. Plastids vary in size, number, shape, and chemical organization with the tissue and organism concerned. "Mature" plastids can be shown to arise from more or less undifferentiated plastid primordia which occur. Figure 3-14. Electron Micrograph of Section of the Photosynthctic Bac- terium, Rlwdospirilluin nihriini. Note the discrete photosynthctic particles (chromatophores) which pack the entire cytoplasm of the cell when it is exposed to light during growth. (From Murray, R. G. E., 1960. "The In- ternal Structure of the Cell, " //; "The Bacteria, " I. C. Gunsalus and R. Y. Stanier (Eds.), Vol. I, Academic Press, New York, N. Y., Fig. 10. p. 49. Courtesy of Dr. R. G. E. Murray. University of Western Ontario.) in meristematic cells, or those of the developing embryo. Such primordia range in size down to the virtually invisible, so that it is difficult, indeed, to determine their origin. In general, plastids appear to be centers of carbohydrate synthesis and metabolism. They are generally classified on the basis of color, though such a classification is not necessarily related to function. Noncolored plastids are usually referred to as leucoplasts, while colored ones are called chromoplasts. Since leucoplasts may give rise to various types of chromoplasts, such classification is of only super- ficial value. Leucoplasts often may function as storage organelles by STRUCTURE AND FUNCTION OF CYTOPLASMIC ORGANELLES / 39. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold

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