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Growth-promoting effects of O. anthropi Mn1 and O. anthropi Mn1g with differential nitrogen supply (left) and N-fixing contribution in various tissues with medium nitrogen supply (right) at 40 DAI. NL, NM and NH stand for low, medium and high nitrogen level with (NH4)2SO4 supply of 0, 2 and 10 mmol l−1 respectively. %Ndfa, percentage of nitrogen derived from air, referring to the amount of nitrogen transferred to plant tissues via BNF as measured using 15N isotope dilution method.
