Biology 2012, 1(2), 196-221; doi:10.3390/biology1020196

Soil Oxidation-Reduction in Wetlands and Its Impact on Plant Functioning

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Received: 12 May 2012; in revised form: 28 June 2012 / Accepted: 29 June 2012 / Published: 26 July 2012
(This article belongs to the Special Issue Feature Papers)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Soil flooding in wetlands is accompanied by changes in soil physical and chemical characteristics. These changes include the lowering of soil redox potential (Eh) leading to increasing demand for oxygen within the soil profile as well as production of soil phytotoxins that are by-products of soil reduction and thus, imposing potentially severe stress on plant roots. Various methods are utilized for quantifying plant responses to reducing soil conditions that include measurement of radial oxygen transport, plant enzymatic responses, and assessment of anatomical/morphological changes. However, the chemical properties and reducing nature of soil environment in which plant roots are grown, including oxygen demand, and other associated processes that occur in wetland soils, pose a challenge to evaluation and comparison of plant responses that are reported in the literature. This review emphasizes soil-plant interactions in wetlands, drawing attention to the importance of quantifying the intensity and capacity of soil reduction for proper evaluation of wetland plant responses, particularly at the process and whole-plant levels. Furthermore, while root oxygen-deficiency may partially account for plant stress responses, the importance of soil phytotoxins, produced as by-products of low soil Eh conditions, is discussed and the need for development of methods to allow differentiation of plant responses to reduced or anaerobic soil conditions vs. soil phytotoxins is emphasized.
Keywords: flooding; photosynthesis; plant stress; soil redox potential; soil phytotoxins; wetlands
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MDPI and ACS Style

Pezeshki, S.R.; DeLaune, R.D. Soil Oxidation-Reduction in Wetlands and Its Impact on Plant Functioning. Biology 2012, 1, 196-221.

AMA Style

Pezeshki SR, DeLaune RD. Soil Oxidation-Reduction in Wetlands and Its Impact on Plant Functioning. Biology. 2012; 1(2):196-221.

Chicago/Turabian Style

Pezeshki, S. R.; DeLaune, R. D. 2012. "Soil Oxidation-Reduction in Wetlands and Its Impact on Plant Functioning." Biology 1, no. 2: 196-221.

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