Mechanism for the hydrogen sulfide‐induced growth limitation in wetland macrophytes

• DOI: 10.4319/lo.1990.35.2.0399
• Publication Date: 2010-04-10T02:32:20Z
• Authors: Marguerite S. Koch; Irving A. Mendels...; Karen L. McKee
• Keywords: Energy charge

Hydrogen sulfide, a phytotoxin that often accumulates in anoxic marine and freshwater marsh soils, suppressed the activity of alcohol dehydrogenase (ADH), enzyme catalyzes terminal step alcoholic fermentation, roots two wetland macrophytes. This inhibition root ADH with increasing sulfide concentration was associated decreases total adenine nucleotide pool (ATP + ADP AMP), adenylate energy charge ratio (AEC), nitrogen uptake (percent recovery 15 NH 4 ‐N) growth (leaf elongation). These responses were species‐specific greater negative impact species naturally inhabits low‐sulfide environments. findings lend support to hypotheses activity, as measure fermentative metabolism, is important maintaining status plants under hypoxic‐anoxic conditions, there significant effect H 2 S on production these roots, an plant energy‐dependent process N uptake.