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Active Potassium Uptake by Slash Pine Roots From O2-depleted Solutions

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Slash pine saplings were grown with their taproots divided between an upper chamber containing a well-drained peat-perlite mixture, and a lower solution-filled chamber. Roots developed in the lower chamber despite limited O2 availability, and exhibited active uptake of K from N2-sparged, hypoxic solutions. Treatments which altered the atmosphere composition (air to N2) surrounding the lower stems and basal taproots produced immediate large effluxes of K from the lower chamber root systems. This response was reversible and showed that submersed roots in hypoxic solutions depended on internal O2 transport from the basal taproot and stem to maintain normal metabolic functions. For. Sci. 36(3):582-598.

Keywords: Pinus elliottii elliotti; hypoxia; water table

Document Type: Journal Article

Affiliations: Adjunct Professor, Soil Science Department, University of Florida, Gainesville, FL 32611

Publication date: September 1, 1990

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