. The cotton plant in Egypt, studies in physiology and genetics. Cotton; Cotton. 68 THE COTTON PLANT IN EGYPT chap. the plant, its immediate cause being the formation of a special tissue across the base of the stalk of the leaf, bud, or flower. The facultative position of this tissue, or " absciss-layer," is marked by a slight groove on the stalk. When the determining stimulus has been received by the cells of this layer, which are otherwise indistinguishable from their neighbours, they proceed to divide, and the daughter-cells separate from one another, thus destroying plants, weekl
. The cotton plant in Egypt, studies in physiology and genetics. Cotton; Cotton. 68 THE COTTON PLANT IN EGYPT chap. the plant, its immediate cause being the formation of a special tissue across the base of the stalk of the leaf, bud, or flower. The facultative position of this tissue, or " absciss-layer," is marked by a slight groove on the stalk. When the determining stimulus has been received by the cells of this layer, which are otherwise indistinguishable from their neighbours, they proceed to divide, and the daughter-cells separate from one another, thus destroying plants, Fig. 46.—Composition of Sheddings. the continuity of the stalk except in such tissues as the wood. The phloem being among the severed tissues, synthesised food supplies are cut off, the organ dies, sooner or later the stalk breaks, and the organ is shed. Even before any sign of unhealthiness becomes visible, the stalk may break at a light touch, being retained merely by the wood-vessels, bast fibres, and cuticle. The reaction to the determining stimulus is very rapid in cotton, on account of the extreme simplicity of the absciss-layer. A convenient way of provoking this unknown stimulus is to cut off a few roots. Within four days after such treatment, we find that complete severance of the tissues of the absciss-layer has taken place. Micro-. 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 Balls, William Lawrence, 1882-. London, Macmillan and Co. , Ltd.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
