Sulfides are known environmental stressors to marine angiosperms. Reduction of sulfate to sulfides by sediment bacteria results in their accumulation in anoxic environments. Gaseous sulfide (H2S) is able to enter marine plants through their roots and rhizomes. We used stable sulfur isotopes to assess sulfide intrusion into the seagrass Halodule wrightii and determine its distribution throughout the plant. We found a gradient in δ34S values (-5.58± 0.54 ‰ to +13.58 ± 0.30 ‰), from roots to leaves, suggesting that H2S enters through underground tissues and is then distributed throughout the plant. The presence of sulfide-derived sulfur in varying proportions (14%-76%) among the leaf, rhizome and root tissues indicates they are able to assimilate it into non-toxic, metabolic forms.

Sulfide intrusion and distribution in the seagrass Halodule wrightii

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.