Archive image from page 135 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Guilliermond - Atkinson 120 — Cytoplasm and GiROUD have maintained that glutathione is found in the chon- driosomes. Joyet-Lavergne reports having locaHzed vitamin A in the chondriosomes and in the plastids, but he does not seem to have brought forward sufficient proofs for this localization. He even reports having proved by means of certain reagents that the oxidation-reduction capacity of the chondriosomes in the Sapro- legniaceae depends on the presence of this subs
Archive image from page 135 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Guilliermond - Atkinson 120 — Cytoplasm and GiROUD have maintained that glutathione is found in the chon- driosomes. Joyet-Lavergne reports having locaHzed vitamin A in the chondriosomes and in the plastids, but he does not seem to have brought forward sufficient proofs for this localization. He even reports having proved by means of certain reagents that the oxidation-reduction capacity of the chondriosomes in the Sapro- legniaceae depends on the presence of this substance in the sub- stratum. As a matter of fact, the reactions used to detect the presence of glutathione in cells are not such as to permit it to be localized in the cytoplasm with any accuracy. At the present time there do not seem to be any microchemical reagents which can localize glutathione in the chondriosomes and the hypothesis of Joyet-Lavergne has not been verified. In fact, we shall see that the chondriosomes do not seem to have of themselves any reducing power. In any case, they are incapable of reducing Janus green to its leucoderivative, contrary to what has been thought up to now. As for the oxidizing role of these elements, it has not been con- firmed either. GiROUD and his collaborator report having localized ascorbic acid, also, within the chon- driosomes of animal cells by using an acid solution of silver nitrate. These investigators moreover, attributed the Molisch reaction (pp. 54, 104) which characterizes the chloro- plasts and which they obtained by the same reagent, to the presence of ascorbic acid in the chloroplasts which are thus reported to be the locus of this substance. To verify this hypothesis, GiROUD and his collaborators measured the quantities of ascorbic acid present in a great number of plants, and found an evident relation between the pres- ence of chlorophyll and that of ascorbic acid. This conception, accepted by various investigators, M
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