. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. Guilliermond - Atkinson 54 — Cytoplasm layer. This supposed submicroscopic structure makes it possible to form new hypotheses for the mechanism of chlorophyll assimila- tion (Baas Becking and Hanson, 1937). As for the pyrenoids which are found in the chloroplasts of many algae, they are still variously considered and opinions as to their significance are not yet well fixed. SCHMITZ, Chmielevsky, and LUTMAN consider them permanent organelles, multiplying by division. Schimper, Klebs and Strasburger saw them disappear and ma
. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. Guilliermond - Atkinson 54 — Cytoplasm layer. This supposed submicroscopic structure makes it possible to form new hypotheses for the mechanism of chlorophyll assimila- tion (Baas Becking and Hanson, 1937). As for the pyrenoids which are found in the chloroplasts of many algae, they are still variously considered and opinions as to their significance are not yet well fixed. SCHMITZ, Chmielevsky, and LUTMAN consider them permanent organelles, multiplying by division. Schimper, Klebs and Strasburger saw them disappear and maintain that they are bodies which form de novo, an opinion which today seems demonstrated. It was thought that the pyren- oids constituted a reserve protein elaborated by the plastids. Other authors, on the contrary, think they play an important role in the foiTnation of starch which always arises in their interior (Lutman, McAllister) or in contact with them (Chadefaud). In terminating this discussion as to the structure and chemical nature of chloroplasts, attention is called to the ability of chloro- plasts to reduce silver salts, especialFy in a 1% solution of silver. 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 Guilliermond, Alexandre, 1876-; Atkinson, Lenette May Rogers, 1899-. Waltham, Mass. , Chronica Botanica Company
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