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Carbohydrate Physiology of Orchid Seedlings. II. Hydrolysis and Effects of Oligosaccharides

Robert Ernst, Joseph Arditti and Patrick L. Healey
American Journal of Botany
Vol. 58, No. 9 (Oct., 1971), pp. 827-835
Stable URL: http://www.jstor.org/stable/2441560
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Carbohydrate Physiology of Orchid Seedlings. II. Hydrolysis and Effects of Oligosaccharides
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Abstract

Orchid seedlings were grown on nutrients containing cold-sterilized sugars as sources of carbon. Action by an extra-cellular invertase was implied from the hydrolysis by seedlings of sugars containing α-D-glucopyranosyl-(1 → 2)-β-D-fructofuranoside bonds. D-galactosides (α and β) were also hydrolyzed, indicating the presence of extracellular galactosidases. Hydrolysis of β-D-fructofuranosides and α-D-galactosides decreased with increasing molecular weight. Seedling damage and growth retardation were paralleled by galactose accumulation in the substrate. Rupture of tonoplast and evagination of the nuclear envelope suggests that this sugar may alter some factor(s) responsible for the maintenance of membrane permeability.

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