Nitrogen fixation in aquatic carnivorous plants

Sirová et al. assess the importance of fixed N in the nutrition of rootless, aquatic, carnivorous Utricularia species (bladderworts).
Nitrogen fixation in aquatic carnivorous plants
Nitrogen fixation in aquatic carnivorous plants

Microbial dinitrogen (N2) fixation has been reported as an additional N source for terrestrial carnivorous plant species. Sirová et al. assess the importance of fixed N in the nutrition of rootless, aquatic, carnivorous Utricularia species (bladderworts), and find that although traps harbour abundant N2-fixing micro-organisms and provide conditions highly suitable for N2-fixation, the fixation rates are low and plant uptake of fixed N is negligible. High mineral N concentrations in the traps, resulting from rapid turnover of organic matter, seem to inhibit the N2-fixation process, and thus they conclude that it is unlikely to contribute significantly to the N nutrition of aquatic carnivorous plants under their typical growth conditions.