John Wiley & Sons, Ltd.

Ammonia stress on the carbon metabolism of Ceratophyllum demersum

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In this experiment, carefully controlled pH ranges (7 and 9) were used to distinguish between the effects of unionised NH3 and the NH4+ ion. The objective was to find the effect of different total ammonia nitrogen concentrations and pHs on the carbon metabolism of Ceratophyllum demersum. This study investigated the effects of ammonia on the non‐structural carbohydrate (NSC) content in shoots of C. demersum. Ammonia treatment decreased the contents of NSC, soluble sugar, sucrose, fructose and starch in leaves. Meanwhile, increasing the pH value exacerbated the decline of the C. demersum NSC content. Additionally, the activity of invertase was increased during the experiment. These results suggest that ammonia severely inhibits plant growth via disturbing the NSC content. It has been suggested that ammonia has toxic effects on C. demersum, and the higher the pH in water is, the more obvious the physiological responses that C. demersum exhibits. The results of the current study can provide some reference for studying the living conditions of submersed macrophytes under the stress of NH3. This article is protected by copyright. All rights reserved

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