Plant-Sediment Interactions in Salt Marshes - An Optode Imaging Study of O2 , pH, and CO 2 Gradients in the Rhizosphere

Frontiers in Plant Science
Ketil Koop-JakobsenKai Jensen

Abstract

In many wetland plants, belowground transport of O2 via aerenchyma tissue and subsequent O2 loss across root surfaces generates small oxic root zones at depth in the rhizosphere with important consequences for carbon and nutrient cycling. This study demonstrates how roots of the intertidal salt-marsh plant Spartina anglica affect not only O2, but also pH and CO2 dynamics, resulting in distinct gradients of O2, pH, and CO2 in the rhizosphere. A novel planar optode system (VisiSens TD®, PreSens GmbH) was used for taking high-resolution 2D-images of the O2, pH, and CO2 distribution around roots during alternating light-dark cycles. Belowground sediment oxygenation was detected in the immediate vicinity of the roots, resulting in oxic root zones with a 1.7 mm radius from the root surface. CO2 accumulated around the roots, reaching a concentration up to threefold higher than the background concentration, and generally affected a larger area within a radius of 12.6 mm from the root surface. This contributed to a lowering of pH by 0.6 units around the roots. The O2, pH, and CO2 distribution was recorded on the same individual roots over diurnal light cycles in order to investigate the interlinkage between sediment oxygenation and CO2 ...Continue Reading

References

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Nov 1, 1994·The New Phytologist·C B M BeggH-U Neue

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Citations

Apr 9, 2019·Biology Letters·Samantha K ChapmanJ Adam Langley
Oct 3, 2020·Biotechnology and Bioengineering·Hicham OuazaiteElie Desmond-Le Quéméner
Dec 9, 2020·International Journal of Molecular Sciences·Florent Le GuernDamien Prim
Jun 29, 2021·Frontiers in Plant Science·Ketil Koop-JakobsenPeter Mueller
Nov 5, 2020·Chemical Reviews·Andreas SteineggerSergey M Borisov

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Software Mentioned

VisiSens ScientifiCal
Fiji
VisiSens
VisiSens ScientifiCal - software
PreSens

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