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Correlation between the levels of ammonium and expression of GS in tobacco transgenic plants. The plants were incubated under moderate light (moderate PFD, 200 μmol cm−2 s−1) subirrigated with 0.5× Hoagland for 20 to 30 d. Ammonium was determined from leaf extracts of the tobacco transgenic lines as indicated. Results are in nanograms of NH4+ per microgram of protein ± se, n = 3 individual plants.
