A Text book of Plant Physiology By George James Peirce
A Text book of Plant Physiology By George James Peirce
George James Peirce
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These cells, stimulated by purely physical influences from outside themselves, develop needs proportioned to their physiological activities. The needs must be met, if the cells are to continue their activities, by materials drawn from their neighbors. So this demand, extending from cell to cell by the osmotic transfer of nutrient solutions, pres- ently reaches the living cells adjoining? the conducting ele- * Jost. L. Beziehungen zwischen der Blattentwickelung und der Gefass- bildung in der Pfl...anze. Bot. Zeitung, 1893. 13 194 PLANT PHYSIOLOGY ments, the cambium and its daughter cells. According to the demand, the stimulus, thus exerted, these daughter cells develop into the so-called "spring wood. " The hypothesis thus outlined would be worthless if it were not for the early growth of the roots which makes possible the supply of the relatively large volume of water demanded by the parts coming from the bud. Goff* has recently shown that growth of the root begins in the spring before there are any signs of growth in the parts above ground.
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