Abstract
Incubation of segments of Phaseolus aureus hypocotyls in an indoleacetic acid (IAA) solution (5 · 10 −6 M) induces an increment of the fresh weight of the segments and simultaneously a decrease of the pH of the incubation medium. This can be observed with segments from all regions of the hypocotyl although there is a gradient in growing potential along this organ. The autolysis rates as well as the glucanase activities of cell walls originated from the “upper” and “lower” parts of the hypocotyls are compared. A possible intervention of cell wall β1 → 3 endoglucanasesin the auxin-inducedgrowth is discussed.
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