Abstract
The productivity of poplar is associated with large nitrogen (N) requirements. Exogenous arbuscular mycorrhizal fungi (AMF) show potential for use as bio-fertilizers. Understanding the interaction between N and exogenous AMF has theoretical and practical significance for poplar plantation. A pot experiment was conducted to assess the effects of N and exogenous Rhizophagus irregularis on plant growth, nutrient uptake, photosynthesis, water status, and leaf anatomical properties of Populus × canadensis ‘Neva’ in natural soil. The results showed that N fertilization increased plant growth, net photosynthesis, water status and the conduit diameter of midribs. The concentrations of carbon (C) and N in leaves were increased, but the phosphorus (P) concentration was decreased by N fertilization. The effectiveness of exogenous R. irregularis varied under different N levels. Under low N levels, exogenous R. irregularis-inoculated plants grew faster and exhibited superior photosynthetic capacity, water status and leaf conduit diameters than non-inoculated plants. Under high N levels, C, N and P concentrations were enhanced by exogenous R. irregularis inoculation. Furthermore, the average conduit diameter of midribs presented a significant positive correlation with plant growth parameters, photosynthesis, relative water content (RWC) and leaf C and N concentrations. It was concluded that exogenous R. irregularis exerted the strongest positive effects under low N levels by promoting plant growth and photosynthesis, and the fungus promoted plant nutrition decoupled from the level of N fertilization. Moreover, the improvement of plant physiological traits due to N fertilization or exogenous R. irregularis inoculation was accompanied by changes in internal anatomical properties.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (41671268 and 31270639, http://www.nsfc.gov.cn/), and the Shaanxi Science and Technology Innovation Project Plan (2016KTCL02-07).
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Fei Wu and Haoqiang Zhang have contributed equally to this work.
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Wu, F., Zhang, H., Fang, F. et al. Effects of Nitrogen and Exogenous Rhizophagus irregularis on the Nutrient Status, Photosynthesis and Leaf Anatomy of Populus × canadensis ‘Neva’. J Plant Growth Regul 36, 824–835 (2017). https://doi.org/10.1007/s00344-017-9686-6
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DOI: https://doi.org/10.1007/s00344-017-9686-6