Axial Distribution of Glycosidases in Relation to Cellular Growth and Ageing inPisum sativumRoot

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Abstract
Tanimoto, E. 1985. Axial distribution of glycosidases in relation to cellular growth and ageing in Pisum sativum root.—J. exp. Bot. 36: 1267–1274. Eight glycosidase activities were measured in relation to cellular growth and ageing along the axis of pea roots. The highest activities of β-D-fucosidase and β-D-glucosidase were in the apical 1.0 mm segment containing the root cap and meristem. Activities of α-L-arabinosidase, α-D-mannosidase, β-D- galactosidase, α-D-glucosidase and β-D-xylosidase were highest in the segment between 1 and 2 mm from the tip and containing young elongating cells with high growth potential. The activity of α-D-galactosidase was high between 1 and 2 mm from the root tip, decreasing to a minimum 4-5 mm from the tip and increasing again up to the base of root. This distribution of enzyme activities relative to the root tip remained unchanged during 28 h while the root length doubled. No α-L--fucosidase, β-L-fucosidase and α-D-xylosidase activities were detected.