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Influence of 2,4‐D and low pH on potassium, ammonium and nitrate uptake by rice roots
Author(s) -
Haunold Ernst
Publication year - 1982
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1982.tb00578.x
Subject(s) - oryza sativa , chemistry , potassium , ammonium , auxin , incubation , potassium nitrate , nitrate , ion transporter , cell permeability , 1 naphthaleneacetic acid , membrane , rice plant , membrane permeability , biophysics , nuclear chemistry , horticulture , biochemistry , biology , cytokinin , gene , organic chemistry
The uptake of the auxin type herbicide 2,4‐D into rice seedlings ( Oryza sativa L. cv. Dunghan Shali) and its effects on the K + , NH + 4 and NO 3 ion uptake and the K + content were investigated at different pH values. A short incubation of the roots in 0.01 m M 2,4‐D caused a marked ion uptake inhibition only at low pH. The non‐auxin type herbicide benthiocarb did not produce such an inhibitory effect. Lowering of the pH in the external medium led to an increased 2,4‐D uptake by the roots. These results can be explained by the increased H + permeability of the membranes, allowing a more rapid entrance of 2,4‐D into the root cells, thereby inhibiting the active ion uptake. Rice roots not subjected to 2,4‐D treatment responded to H + stress with an increased anomalous K + uptake and a decreased K + content. With reference to the effects of pH changes on the ion and 2,4‐D uptake, possible transport mechanism of NH + 4 and 2,4‐D are briefly discussed.