Soil contamination by cadmium (Cd) and degradation by salinity are likely to become one of the most important problems hindering food production and human health. However, their combined effect on crops is still ambiguous. A hydroponic study was made to investigate the separate and combined exposure of 100 µM Cd and 150 µM NaCl on soybeans (Glycine max L.) growth, photosynthetic pigment, and antioxidant systems for 7 days. Both Cd and NaCl, applied separately decreased the seedlings growth, chlorophyll contents and caused oxidative stress. However, the toxic effects of salinity applied alone were more pronounced. Interestingly, combined exposure of Cd and NaCl induced higher decreases in all growth parameters and lipid peroxidation than single exposure suggesting synergistic effects. The results implicate that the phytotoxicity of both stressors can be associated with redox status imbalance. Our finding may provide insight into the physiological mechanisms of heavy metal exposure and salinity stress tolerance in soybeans and suggest that saline stress changes the effects of Cd toxicity on crops in Cd-salt-polluted soils.

土壤镉（Cd）污染和盐分退化可能成为阻碍粮食生产和人类健康的最重要问题之一。然而，它们对农作物的综合影响仍然不明确。进行了一项水培研究，以研究 100 µM Cd 和 150 µM NaCl 单独和联合暴露7 天对大豆 ( Glycine max L.) 生长、光合色素和抗氧化系统的影响。单独施用镉和氯化钠都会降低幼苗的生长、叶绿素含量并引起氧化应激。然而，单独使用盐度的毒性作用更为明显。有趣的是，与单一暴露相比，镉和氯化钠的联合暴露导致所有生长参数和脂质过氧化的降低程度更高，这表明存在协同效应。结果表明，两种应激源的植物毒性可能与氧化还原状态失衡有关。我们的发现可能有助于深入了解大豆重金属暴露和盐胁迫耐受性的生理机制，并表明盐胁迫改变镉毒性对镉盐污染土壤中作物的影响。