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Evidence for a Direct Effect of Water Stress on Tracheid Cell Wall Metabolism in Pine

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Tissues of developing xylem were excised from the main stems of 16-year-old Pinus sylvestris L. trees and incubated in solutions containing labelled glucose and varying concentrations of polyethylene glycol. Increase in water stress with polyethylene glycol caused a significant lowering of glucose incorporation. As water potential decreased from -- 3.1 atm, a level common in stems under favorable growing conditions, to -- 28.1 atm, a level common under conditions of environmental stress, incorporation of labelled glucose was reduced by over 50 percent. Water stress thus has a direct effect on the cell wall metabolism of cambial derivatives in pine, independent of regulation from the crown foliage.

Document Type: Journal Article

Affiliations: Professor of Forestry, School of Natural Resources, The University of Michigan

Publication date: December 1, 1967

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