Abstract
Background and aims
Intra-leaf nitrogen allocation plays a pivotal role in plant growth performance; however, the effects of arbuscular mycorrhizal (AM) fungi on the allocation of nitrogen within a leaf remain poorly understood.
Methods
A pot experiment was conducted with different nitrogen levels and Populus × canadensis ‘Neva’ with or without Rhizophagus irregularis inoculation. The fractions of leaf nitrogen allocated to water-soluble protein, membrane-bound protein, cell wall protein and photosynthetic apparatus were used to estimate nitrogen allocation strategy.
Results
AM fungi increased the light-saturated photosynthetic rate (Pmax) and photosynthetic nitrogen use efficiency (PNUE) under low nitrogen levels, whereas the nitrogen content per unit area (Narea) and nitrogen content per unit mass (Nmass) were unaffected. AM inoculation decreased leaf mass per area (LMA) and the fraction of leaf nitrogen allocated to cell walls but increased the fraction of nitrogen allocated to photosynthesis under low nitrogen levels. The increased fraction of photosynthetic nitrogen allocated to carboxylation (PC) and bioenergetics (PB) in response to AM inoculation under low nitrogen levels contributed to the higher Pmax and PNUE values.
Conclusion
The improved photosynthesis and PNUE resulting from AM inoculation were mostly determined by the relative allocation of nitrogen to photosynthesis and not by the leaf nitrogen concentration. AM fungi may enhance nitrogen allocation to photosynthesis at the expense of cell walls.
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Abbreviations
- AM:
-
Arbuscular mycorrhizal
- LMA:
-
Leaf mass per area
- Narea :
-
Nitrogen content per unit area
- NB :
-
Nitrogen contents in bioenergetics
- NC :
-
Nitrogen contents in carboxylation
- NL :
-
Nitrogen contents in light-harvesting
- Nmass :
-
Nitrogen content per unit mass
- PB :
-
The fraction of leaf nitrogen allocated to bioenergetics
- PC :
-
The fraction of leaf nitrogen allocated to carboxylation
- PL :
-
The fraction of leaf nitrogen allocated to light-harvesting
- Pmax :
-
Light-saturated photosynthetic rate
- PNUE:
-
Photosynthetic nitrogen use efficiency
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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/), the Shaanxi Science and Technology Innovation Project Plan (2016KTCL02-07), the Excellent Young Teachers Training Program (Z111021605), and the Fundamental Research Fund of Northwest A&F University (2452015169).
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Wu, F., Zhang, H., Fang, F. et al. Arbuscular mycorrhizal fungi alter nitrogen allocation in the leaves of Populus × canadensis ‘Neva’. Plant Soil 421, 477–491 (2017). https://doi.org/10.1007/s11104-017-3461-0
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DOI: https://doi.org/10.1007/s11104-017-3461-0