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Azolla  spp., a water fern often used for phytoremediation, is a strong phosphorus (P) accumulator due to its high growth rate and N 2  fixing symbionts (diazotrophs). It is known that plant growth is stimulated by P, but the nature of the interactive response of both symbionts along a P gradient, and related changes in growth-limiting factors, are unclear. We determined growth, and N and P sequestration rates of  Azolla filiculoides  in N-free water at different P concentrations. The growth response appeared to be biphasic and highest at levels ≥10 P µmol l −1 . Diazotrophic N sequestration increased upon P addition, and rates were three times higher at high P than at low P. At 10 µmol P l −1 , N sequestration rates reached its maximum and  A. filiculoides  growth became saturated. Due to luxury consumption, P sequestration rates increased until 50 µmol P l −1 . At higher P concentrations (≥50 µmol l −1 ), however, chlorosis occurred that seems to be caused by iron- (Fe-), and not by N-deficiency. We demonstrate that traits of the complete symbiosis in relation to P and Fe availability determine plant performance, stressing the role of nutrient stoichiometry. The results are discussed regarding  Azolla ’s potential use in a bio-based economy.

Azolla along a phosphorus gradient: biphasic growth response linked to diazotroph traits and phosphorus-induced iron chlorosis