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Physiological Adaptations to Wetland Habitats

  • William Armstrong
  • Timothy D. Colmer
Reference work entry

Abstract

Low gas-diffusivity and oxygen-solubility in water are primary constraints in wetland and aquatic environments. Consequentially, microbes may remove oxygen from all but surface layers of waterlogged soils and generate phytotoxins, while shoot-submergence may substantially reduce CO2-availability for photosynthesis, compromising carbohydrate production. Oxygen limitations may cause energy crises within the plant and self-generation of damaging reactive oxygen species; enhanced generation and entrapment of the gaseous hormone ethylene also accompany waterlogging and submergence. Globally, wetlands differ in altitude, timing, duration and depth of flooding, light, temperature, and biogeochemistry. Consequently, suites of adaptive traits have evolved in plants to accommodate these varied conditions. Adaptations include anoxia avoidance by facilitating gas exchange with the atmosphere to support aerobic metabolism, an emergence escape strategy or a medium-term submergence tolerance strategy, or production of leaves capable of photosynthesis when submerged. Other adaptations include short- or long-term anoxia tolerance or protection from reactive oxygen species and phytotoxins.

Keywords

Anoxia avoidance Reactive oxygen species Tolerance of anoxia Post-anoxic injury Phytotoxins 

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Biological SciencesUniversity of HullKingston upon HullUK
  2. 2.School of Plant BiologyThe University of Western AustraliaCrawleyAustralia

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