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Effects of two microbial products on net influx and net efflux of 15N-containing compounds. Axenic alfalfa roots treated with 150 μm Z or 100 μm DAPG were tested for effects on influx of 15N-Ala (A) and, separately, for effects on efflux of 15N-containing compounds from seedlings labeled with (15NH4)2SO4 in the previous generation (B). Data are expressed as mean changes (+ se) over a 3-h period in atom % 15N excess, relative to a reference of 0.36679 atom % 15N.
