. Botany of the living plant. Botany; Plants. BOTANV OF THE LIVING PLANT . i it a common polysaccharide in plants, and is built up from many molecules. LI forma ubstance, either of a in fee chloroplasta oi the leal where its | e in â Ulth pi a noted: or of a more permanent IMt. many kinds. It ia almosl always deposited in the form ol grains within plastids, either the « nlortplasts of green organs, ,,r . tponding but colourless Uucoplasts ol uon-green organs (Figs. j1( g, | lh,- presence within plant tissues oi an enzyme, Diastase,. TQB. Fig. 8i. inn Potato. A, with minute leucoplasts surroun
. Botany of the living plant. Botany; Plants. BOTANV OF THE LIVING PLANT . i it a common polysaccharide in plants, and is built up from many molecules. LI forma ubstance, either of a in fee chloroplasta oi the leal where its | e in â Ulth pi a noted: or of a more permanent IMt. many kinds. It ia almosl always deposited in the form ol grains within plastids, either the « nlortplasts of green organs, ,,r . tponding but colourless Uucoplasts ol uon-green organs (Figs. j1( g, | lh,- presence within plant tissues oi an enzyme, Diastase,. TQB. Fig. 8i. inn Potato. A, with minute leucoplasts surrounding the nucleus. B already fanning starch, stained darkly with iodine. C shows furt irmation, and one cubical protein crystal. ( â 220.) which promotes the decomposition of starch into maltose, can easily be demonstrated, and it ia generally assumed that the same enzyme at other times builds up starch from maltose. This enzyme appears to be located in the ids. Starch grains show a characteristic stratification, which is related to their growth by apposition (Fig. 82), while the blue-black coloration with iodine is also distinctive. They may be simple or compound, and are larger in storage organs than in the leaf. Inulni i> another reserve polysaccharide, built up from fructose, and differ- farther from starch in its restricted occurrence in plants, and by its exist- in .1 state of colloidal solution in the cell-sap. It is present in large quantity in the storage organs of members of the Compositae, Dahlia roots and Artichoke tubers. Uulose is the substance from which the walls of plant-cells, especially of young cells, are largely built up, and is thus of structural rather than of importance. The cellulose is deposited by the protoplast. Its molecule ia larger than that of starch, but it again is built up from a large number of glucose mole ules, presumably under the influence of enzymes. An enzymi m 1 apable of converting cellulose to glucose ha
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Keywords: ., bookcentury1900, bookpublis, booksubjectbotany, booksubjectplants
