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A contribution to the repressing effect of ammonium on nitrate uptake |
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| Authors: | Josef Wieneke |
| Abstract: | The instantaneous impairing effect of 0.5 mM NH4+ on 13NO3? influx/net uptake and the early kinetics of 13NH4+ influx are demonstrated in experiments with barley and squash seedlings. Barley was found to have a high constitutive NH4+ uptake capacity in contrast to squash where NH4+ pretreatment appeared to accelerate the uptake after a certain lag phase. |
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