Effect of Epichloë gansuensis endophyte on the activity of enzymes of nitrogen metabolism, nitrogen use efficiency and photosynthetic ability of Achnatherum inebrians under various NaCl concentrations
2019
Wang, Jianfeng | Tian, Pei | Christensen, Michael J. | Zhang, Xingxu | Li, Chunjie | Nan, Zhibiao
BACKGROUND AND AIMS: This study explored the effects of Epichloë gansuensis endophyte on photosynthetic ability, the activity of nitrogen metabolism enzymes, nitrogen use efficiency, and biomass accumulation of Achnatherum inebrians growing under five NaCl concentrations. METHODS: A. inebrians plants with (E+) and without E. gansuensis (E−) were grown under different NaCl concentrations. Photosynthetic indexes, NO₃⁻ and NH₄⁺ content, nitrate reductase (NR), nitrite reductase (NiR), glutamine synthetase (GS) activity, nitrogen use efficiency and nitrogen content were determined. RESULTS: The plant total biomass, NO₃⁻ and N content, NR, NiR and GS activity, total N accumulation (TNA), nitrogen utilization efficiency (NUtE) and nitrogen uptake efficiency (NUpE) were higher in leaves and roots of E+ than of E− plants under 300 and 400 mM NaCl concentrations, but NH₄⁺ content was lower in leaves and roots of E+ than of E− plants under 100, 200, 300 and 400 mM NaCl concentrations. However, there were almost no significant effects on these factors between E+ and E− plants under the 0 mM NaCl concentration. CONCLUSIONS: The endophyte improved the growth of plants under high NaCl concentration by improving photosynthetic ability, increasing the activity of nitrogen metabolism enzymes and nitrogen use efficiency.
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