. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. PROTEINS 51 The proteins of oil-containing seeds { Castor Oil, Brazil- nut) occur in the form of especially large granules, known as aleitrone grains. These appear to arise, as the seed dries during ripening, from the entire contents of vacuoles rich in protein- substance. Although the structure of aleurone grains is relatively complicated, they exhibit the characteristic protein-reactions mentioned above. If a thin section of the Castor Oil or Brazil- nut (from which the fat has been removed by soaking i
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. PROTEINS 51 The proteins of oil-containing seeds { Castor Oil, Brazil- nut) occur in the form of especially large granules, known as aleitrone grains. These appear to arise, as the seed dries during ripening, from the entire contents of vacuoles rich in protein- substance. Although the structure of aleurone grains is relatively complicated, they exhibit the characteristic protein-reactions mentioned above. If a thin section of the Castor Oil or Brazil- nut (from which the fat has been removed by soaking in alcohol and benzene respectiveh") be stained with iodine, the brown-. FiG. 23.—Aleurone grains {AL] from the endosperm of the Castor Oil plant [Ricinus) showing the globoid (GI.) and cr^-stalloid [Cr.). coloured grains are readilv seen under the microscope. Each shows a bounding membrane, the original membrane of the vacuole, enclosing amorphous protein in which two or more bodies are embedded. One of these, the crystalloid (Fig. 23, Cr.), is large and more or less angular, whilst the other, the globoid, is smaller and rounded (Fig. 23, Gl.) : both consist of protein, but in the globoid, of which more than one may be present, this is combined with a double phosphate of calcium and mag- nesium. Bv mounting sections in water the amorphous ground- mass of the aleurone grain mav be dissolved, and the bounding membrane rendered clearlv visible : on the other hand, treatment. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
