We studied the propensity of the tank bromeliad Werauhia gladioliflora to emit the greenhouse gas nitrous oxide (NO) at current and at increased N deposition levels in the range of predicted future scenarios. Potential production rates and net accumulation of NO from tank substrate corresponded to N availability. NO was produced in excess at all N levels due to a low level of NO reductase activity which agreed well with a low abundance of NO reducers compared to nitrite reducers. Transcriptional activation, however, indicated that expression of denitrification genes may be enhanced with increasing N supply eventually leading to more efficient NO turnover with potential for adaptation of denitrifier communities to higher N levels. Our findings indicate that tank bromeliads may constitute a novel source of NO in Neotropical forest canopies but further studies are required to understand the size and significance of in situ NO fluxes from tank bromeliads to the environment.
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