Chloride (Cl⁻) is required for photosynthesis and regulates osmotic balance. However, excess Cl⁻ application negatively interacts with nitrate (\({\mathrm{NO}}_{3}^{-}\)) uptake, although its effect on \({\mathrm{NO}}_{3}^{-}\) metabolism remains unclear. The aim was to test whether Cl⁻ stress disturbs nitrate reductase activity (NRA). A maize variety (Zea mays L. cv. LG 30215) was hydroponically cultured in a greenhouse under the following conditions: control (2 mM CaCl₂), moderate Cl⁻ (10 mM CaCl₂), high Cl⁻ (60 mM CaCl₂). To substantiate the effect of Cl⁻ stress further, an osmotic stress with lower intensity was induced by 60 g polyethylene glycol (PEG) 6000 L⁻¹ + 2 mM CaCl₂), which was 57% of the osmotic pressure being produced by 60 mM CaCl₂. Results show that high Cl⁻ and PEG-induced osmotic stress significantly reduced shoot biomass, stomatal conductance and transpiration rate, but NRA was only decreased by high Cl⁻ stress. The interference of NRA in chloride-stressed maize is supposed to be primarily caused by the antagonistic uptake of Cl⁻ and \({\mathrm{NO}}_{3}^{-}\).

氯化物（CL ^- ）所需的光合作用和调节渗透压平衡。然而，过量的氯^-应用负硝酸盐相互作用（\（{\ mathrm {NO}} _ {3} ^ { - } \） ）的摄取，尽管其上作用\（{\ mathrm {NO}} _ {3} ^ {-} \）代谢仍不清楚。其目的是测试是否氯^-硝酸盐应力会干扰还原酶活性（NRA）。甲玉米品种（玉蜀黍。L. CV LG 30215）在温室中水培在以下条件下：控制（2毫米氯化钙₂），中度氯^-（10毫米氯化钙₂），高氯^-（60毫米氯化钙₂）。证实Cl组成的效果^-进一步应力，具有较低强度的渗透胁迫诱导60克聚乙二醇（PEG）6000大号^-1  + 2毫米氯化钙₂），这是渗透压的57％是由60mM的产生氯化钙₂。结果表明，高氯^-和PEG诱导的渗透胁迫显著减少枝条生物量，气孔导度和蒸腾速率，但NRA只减少高氯^-应力。NRA的在氯乙烯-强调玉米的干扰应该被主要由Cl组成的拮抗摄取引起^-和\（{\ mathrm {NO}} _ {3} ^ { - } \） 。