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A contribution to the repressing effect of ammonium on nitrate uptake
Author(s) -
Wieneke Josef
Publication year - 1995
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19951580416
Subject(s) - squash , ammonium , nitrate , chemistry , kinetics , hordeum vulgare , ammonium nitrate , biophysics , horticulture , nuclear chemistry , botany , biology , poaceae , organic chemistry , physics , quantum mechanics
The instantaneous impairing effect of 0.5 mM NH 4 + on 13 NO 3 − influx/net uptake and the early kinetics of 13 NH 4 + influx are demonstrated in experiments with barley and squash seedlings. Barley was found to have a high constitutive NH 4 + uptake capacity in contrast to squash where NH 4 + pretreatment appeared to accelerate the uptake after a certain lag phase.