Interactions between sulfide and reproductive phenology of an annual aquatic plant, wild rice (Zizania palustris)

Sophia LaFond-Hudson, Nathan W. Johnson, John Pastor, Brad Dewey

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Aquatic plants live in anoxic sediments that favor formation of hydrogen sulfide, a known phytotoxin. We investigated how the phenology of reproductive life stages of wild rice (Zizania palustris Poaceae), an annual aquatic graminoid, is influenced by rooting zone sulfur geochemistry in response to elevated sulfate and sulfide. In addition, we characterized how redox conditions in the rooting zone change throughout reproduction to determine if they are tied to plant life stage. The redox conditions in sediment decreased just prior to flowering, and again just prior to seed production for all plants, allowing sulfide to accumulate at the root surface of sulfate-amended plants. Plants exposed to sulfide initiated seed production later than unamended plants. Sulfide appears to slow plant development in a way that gives the plant less time to allocate nutrients to seeds before senescence. The impact of sulfide in delaying reproductive life stages of wild rice and changing seasonal rooting zone biogeochemistry could extend to other plant species and additional chemical species that change mobility with redox potential, such as phosphate, manganese, mercury, and other metals.

Original languageEnglish (US)
Article number103230
JournalAquatic Botany
Volume164
DOIs
StatePublished - May 2020

Bibliographical note

Funding Information:
This work was prepared by S. LaFond-Hudson, N. Johnson, J. Pastor, and B. Dewey using federal funds under award NA15OAR4170080 from Minnesota Sea Grant, National Sea Grant College Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce. The statements, findings, conclusions, and recommendations are those of the author(s) and do not necessarily reflect the views of NOAA, the Sea Grant College Program, or the U.S. Department of Commerce. Thank you to the Fond du Lac Band of Lake Superior Chippewa for providing sediment.

Funding Information:
This work was prepared by S. LaFond-Hudson, N. Johnson, J. Pastor, and B. Dewey using federal funds under award NA15OAR4170080 from Minnesota Sea Grant, National Sea Grant College Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce . The statements, findings, conclusions, and recommendations are those of the author(s) and do not necessarily reflect the views of NOAA, the Sea Grant College Program, or the U.S. Department of Commerce. Thank you to the Fond du Lac Band of Lake Superior Chippewa for providing sediment.

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

  • Geochemistry
  • Ontogeny
  • Rhizosphere
  • Seed production
  • Wild rice

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