Abstract
Arbuscular mycorrhizal fungi (AMF) can promote plant growth performance, but their effectiveness varies depending on soil nitrogen (N) availability. To clarify the effectiveness of exogenous AMF along an N-fertilization gradient (0, 2, 10, 20, and 30 mM), the impacts of exogenous Rhizophagus irregularis and N on the growth, photochemical activity, and nutritional status of Populus × canadensis ‘Neva’ in natural soil were evaluated in a pot experiment. The results showed that the 10 mM N level was the optimal fertilization regime with the highest promotion effect on plant growth and the maximum quantum yield of photosystem II (PSII) (Fv/Fm). Excess N (20 and 30 mM) fertilization reduced the actual quantum yield of PSII (ФPSII) and the Fv/Fm of the plants. Regardless of the N availability, inoculated plants exhibited greater Fv/Fm values than did non-inoculated plants. The biomass of inoculated plants was significantly higher compared with the control under low N levels (0 and 2 mM). Under high N levels, inoculated plants showed significant increases in ФPSII. Moreover, the nutrient imbalance of plants inoculated with exogenous R. irregularis was eased by increasing P, Fe, Mn and Cu uptake in roots and higher P, Ca, Mg, Fe, Mn and Zn concentrations in leaves. Moreover, the Fv/Fm and ФPSII exhibited positive correlations with P, Ca, Mg and Zn concentrations in leaves. In conclusion, inoculation with exogenous R. irregularis can benefit plant fitness by improving the photochemical capacity and nutrient composition of poplar under different N levels.
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This study was supported by the National Natural Science Foundation of China (41671268 and 31270639), and the Shaanxi Science and Technology Innovation Project Plan (2016KTCL02-07).
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Wu, F., Zhang, H., Fang, F. et al. Nutrient allocation and photochemical responses of Populus × canadensis ‘Neva’ to nitrogen fertilization and exogenous Rhizophagus irregularis inoculation. Acta Physiol Plant 40, 152 (2018). https://doi.org/10.1007/s11738-018-2728-2
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DOI: https://doi.org/10.1007/s11738-018-2728-2