. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. A B C F'iG. 20. — Positions taken by chloroplasts in cells of seedlings of Saccorhiza bulhosa in intense (A) and weak (C) illumination. B, intermediate position. (After Sauvageau). nitrate. This property, discovered by MOLISCH and called the Mo- LISCH reaction, is connected neither with chlorophyll nor the caro- tinoid pigments, is produced only in living tissues and seemed to MOLISCH to be independent of light. MOLISCH attributed it to the presence of formaldehyde in the chloroplasts. Investigations of Gautheret have led
. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. A B C F'iG. 20. — Positions taken by chloroplasts in cells of seedlings of Saccorhiza bulhosa in intense (A) and weak (C) illumination. B, intermediate position. (After Sauvageau). nitrate. This property, discovered by MOLISCH and called the Mo- LISCH reaction, is connected neither with chlorophyll nor the caro- tinoid pigments, is produced only in living tissues and seemed to MOLISCH to be independent of light. MOLISCH attributed it to the presence of formaldehyde in the chloroplasts. Investigations of Gautheret have led to important information about the conditions under which the MOLISCH reaction is carried out. This research showed that light plays a role in the reduction of silver nitrate by chloroplasts: the reduction begun by the action of light may con- tinue subsequently in the dark. Gautheret's work proved finally that this reaction is not due to the presence of formaldehyde in the chloroplast but to reducing substances still unknown. More recently GiROUD and his collaborators claimed that the Molisch reaction is to be attributed to the presence of ascorbic acid within the chloroplasts which, therefore, these workers believe to be the source of this substance. Movement of chloroplasts:- It has been known for some time that chloroplasts are capable of moving from place to place and, depending upon the intensity of the light, are capable of placing themselves on one side or the other of a cell. But for a long time it has been said that they play only a passive role in these move-. 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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