. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. '^i*vf?. Fig. 33. — Development of chloroplasts in a young leaf of the plumule of barley. 1, chondriome in the basal meristem; 2, cells beginning to differentiate with some elements of the chondri- ome showing thickening, and 3-5 their transformation into chloroplasts; 7, cells in older regions showing chloroplasts. c, young chloroplasts; gc, mature chloroplast. Regaud's method. with silver nitrate followed by treatment with a reducing solution of hydroquinone, he noticed that the chloroplast has the property of reducing s
. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. '^i*vf?. Fig. 33. — Development of chloroplasts in a young leaf of the plumule of barley. 1, chondriome in the basal meristem; 2, cells beginning to differentiate with some elements of the chondri- ome showing thickening, and 3-5 their transformation into chloroplasts; 7, cells in older regions showing chloroplasts. c, young chloroplasts; gc, mature chloroplast. Regaud's method. with silver nitrate followed by treatment with a reducing solution of hydroquinone, he noticed that the chloroplast has the property of reducing silver nitrate and appears strongly blackened by a deposit of metallic silver on its substratum. Now, while studying the chloroplasts in differentiating tissues, Pensa stated that these elements appear first as very small bodies which present the form characteristic of chondriosomes in animal cells. Yet this author never reached the point of specifying the origin of these chon- driosome-shaped elements. He did not find them in tissues lack- ing in chlorophyll and stated that their property of reducing silver nitrate is correlated with the presence of chlorophyll in the substratum. Pensa, however, put forth the hypothesis that the chloroplasts are derived from chondriosomes on which chlorophyll accumulates, giving them the property of reducing 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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