Author:
Ahmad Mukhtar,Cailloux Marcel
Abstract
The influence of a range of concentrations of malonate on the rate of water absorption by the root hairs of Avena sativa is investigated. Different results are obtained when malonate is applied on root hairs of various lengths. At higher concentrations (10−6, 10−7 M) inhibitory effects are predominant, resulting in the rapid death of the root hair or heavy excretion, whereas at lower concentrations (10−8, 10−9, 10−10 M) an increase in absorption rate indicates a direct participation of malonate in respiratory metabolism.A close relationship exists between the length or age of a root hair (amount of cytoplasm present in the root hair at the region of immersion) and the inhibitory effects of malonate. The survival period is long when the root hair is young or when cytoplasm is abundant.The evidence suggests that absorption of water by root hairs of Avena sativa is perhaps not osmotic, as metabolic energy seems to be directly involved in it, at least when the plant is deprived of foliage.
Publisher
Canadian Science Publishing
Cited by
5 articles.
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