Depletion of the heaviest stable N isotope is associated with NH4+/NH3 toxicity in NH4+-fed plants.

BMC Plant Biol · 2011 · PMC3224212 · PMID 21575190

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In our study, we did not determine the net NH 4 + fluxes, but previous findings demonstrated that the root NH 4 + -induced efflux occurs in a broad range of plant species and are more or less significant depending on the NH 4 + sensitivity of the plant species [ 44 ].

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