Abstract
Matchett, William H., and J. F. Nance. (U. Illinois, Urbana.) Cell wall breakdown and growth in pea seedling stems. Amer. Jour. Bot. 49(4): 311–319. Illus. 1962.—Carbon-14 introduced into cell-wall constituents of pea stems is subject to metabolic turnover. Turnover is increased when test tissues are supplied with growth-promoting levels of indoleacetic acid and decreased by growth-inhibiting levels of mannitol and galactose. Studies on uptake of calcium-45 confirm earlier work by showing that treatment of pea-stem slices with growth-promoting levels of indoleacetic acid results in an increased capacity for rapid uptake of calcium ion. Studies on loss of calcium-45 by previously labeled pea-stem slices confirm earlier observations by showing that this loss is greatly enhanced by the presence of indoleacetic acid. Experiments designed to test the effects of various exchangeably bound ions upon the extent of carbon-14 turnover reveal that turnover is increased by the presence of potassium ion or magnesium ion and that in each case calcium ion reverses the effect. Studies on the tip-burst response exhibited by growing pollen tubes reveal that either anaerobiosis or the presence of potassium ion increases the frequency of bursting. The results of this investigation are discussed with reference to several hypotheses concerning plasticization of the primary cell wall.
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