Xiao-Fang Yu , Zhi-Wen Wang , Feng-Lian Chen , Mao-Lin Chen , Xin-Yu Zhang , Jun-Rui Zhang , Wen-Yu Ji , Xue Xiao , Li-Juan Yang , Ting Lei , Xi Li , Ming-Yan Jiang
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引用次数: 0
摘要
镉(Cd)是一种广泛分布的剧毒重金属,对土壤肥力和植物生长构成严重威胁。柠檬酸(CA)是一种小型有机酸分子,在减轻重金属对植物的毒性方面发挥着至关重要的作用。然而,CA 如何组织和减轻重金属对植物细胞造成的损害的具体机制仍不清楚。因此,我们研究了外源 CA 对鸢尾镉诱导胁迫的影响。结果表明,添加外源 CA 能显著提高抗氧化酶的活性,并改变铁、锌、钙和锰等矿物质元素的含量。值得注意的是,与纯镉处理相比,CA存在时根系细胞壁中镉的比例增加了14%,这种增加是由于CA能够调节根系细胞壁中多糖成分的含量。CA 影响了果胶酯酶(PME)的活性,改变了果胶酯化程度(PMD),增强了根细胞壁结合镉的能力,从而降低了地上部组织中的镉含量,减轻了植物的重金属毒性。总之,这项研究提供了有力的证据,支持使用 CA 提高城市土壤修复的效率。
The mitigation of citric acid on cadmium toxicity in Iris tectorum and its effects on the composition of cell walls
Cadmium (Cd), a widely distributed and highly toxic heavy metal, poses a severe threat to soil fertility and plant growth. Citric acid (CA), a small organic acid molecule, plays a crucial role in alleviating heavy metal toxicity in plants. However, the specific mechanism underlying how CA organizes and mitigates the damage caused by heavy metals to plant cells remains unclear. Therefore, we studied the impact of exogenous CA on Cd-induced stress in Iris tectorum. The results showed that the addition of exogenous CA significantly increased the activity of antioxidant enzymes and altered the content of mineral elements including Fe, Zn, Ca, and Mn. Notably, compared to the Cd-only treatment, the proportion of Cd in the root cell walls increased by 14% in the presence of CA, and this increase was due to the ability of CA to regulate the amount of polysaccharide components in the root cell walls. CA affected the activity of pectinesterase (PME), changed the degree of pectinesterification (PMD), and enhanced the root cell walls’ ability to bind Cd, thereby reducing the Cd content in the above-ground tissues and alleviating heavy metal toxicity in plants. In summary, this study provides robust evidence that supports the use of CA to improve the efficiency of urban soil remediation.
期刊介绍:
International Biodeterioration and Biodegradation publishes original research papers and reviews on the biological causes of deterioration or degradation.