. Botany of the living plant. Botany. HO ROTANY OF THE LIVING PLANT starch or cellulose, or it may be transformed into fats. In order to be again of physiological use these insoluble substances must be con- verted back into sugar. The niellwds of storage and transfer of carbo- hydrates may best be illustrated by the commonest example, viz. by the case of Sugar and 3 Vie. 79. Cells of young Potato. A, with militate leukoplasts surrounding the nucleus. B shows some of these already forming starch, stained darkly with iodine. C shows further starch-formation, and one cubical protein-crys
. Botany of the living plant. Botany. HO ROTANY OF THE LIVING PLANT starch or cellulose, or it may be transformed into fats. In order to be again of physiological use these insoluble substances must be con- verted back into sugar. The niellwds of storage and transfer of carbo- hydrates may best be illustrated by the commonest example, viz. by the case of Sugar and 3 Vie. 79. Cells of young Potato. A, with militate leukoplasts surrounding the nucleus. B shows some of these already forming starch, stained darkly with iodine. C shows further starch-formation, and one cubical protein-crystalloid. { ;: 220.) Sugar is a comprehensive term which covers a number of closely related carbohydrates soluble in water. Glucose is probably the first product of Photo-Synthesis. Sugar is also the usual form in which carbohydrate may be transferred from place to place in the plant. This depends upon its solubility in water, through which medium it may move by diffusion. The B tissues contain water of imbi- bition, and also fluid water; and though the living proto- plasts are able to exercise control over movements by diflusion, nevertheless water as the ready medium of deposit, or of transit for sugar is constantly present. But soluble sugar is B, isolated aleurone grains in oil. A = albnmun j, K,,ll-v form of a rcntnillT tinn crystals. g = globoid. ( / 540.) (.-Mter Strasburger.) '^ ULIlKy iorin CL aCCUmUianon of carbohydrate, and being osmotically active, would in large quantities raise difficulties in rela- tion to turgor of the cells. Consequently it is commonly converted into insoluble Starch, in the form of Starch-Grains. Such grains are not formed at large in the cell, but always in relation to plastids. These may be in the form of green chloroplasls, in which the included starch-grains make their appearance as the first visilile result of Photo-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
