Inhibition of Camellia japonica Pollen Tube Growth by Maltose

概要

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Various oligosaccharides were studied with regard to their effect on the in vitro growth of Camellia japonica pollen tube. Sucrose, raffinose, melezitose, cellobiose, turanose and isomaltose, especially the first four, promoted pollen tube growth, while maltotriose, trehalose, gentiobiose, palatinose, melibiose, lactose and lactulose had little effect. Maltose strongly inhibited not only the tube growth on sugar-free medium but also sugar-stimulated growth, except in the case of sucrose stimulation. Glycosidase activities toward the growth-stimulating oligosaccharides were detected in the extract of sucrose-grown pollen, but the activities of α-glucosidase and α-galactosidase were much lower than those of β-fructosidase and β-glucosidase. Maltose suppressed the increase in UDP-glucose level of the glucose-grown pollen but not that of the sucrose-grown one. These results suggest that maltose acts, directly or indirectly, somewhere in the pathway from glucose to UDP-glucose via glucose-1-phosphate, but does not interfere with the direct conversion of sucrose to UDP-glucose.
日本植物生理学会の論文