Abstract：
Vegetable cultivation under sewage irrigation is a common practice mostly in developing countries due to a lack of freshwater. Long-term usage provokes heavy metals accumulation in soil and ultimately hinders the growth and physiology of crop plants and deteriorates the quality of food. A study was performed to investigate the role of brassinosteroid (BRs) and silicon (Si) on lettuce, spinach, and cabbage under lead (Pb) and cadmium (Cd) contaminated sewage water. The experiment comprises three treatments (control, BRs, and Si) applied under a completely randomized design (CRD) in a growth chamber. BRs and Si application resulted in the highest increase of growth, physiology, and antioxidant enzyme activities when applied under canal water followed by distilled water and sewage water. However, BRs and Si increased the above-determined attributes under the sewage water by reducing the Pb and Cd uptake as compared to the control. It\'s concluded that sewerage water adversely affected the growth and development of vegetables by increasing Pb and Cd, and foliar spray of Si and BRs could have great potential to mitigate the adverse effects of heavy metals and improve the growth. The long-term alleviating effect of BRs and Si will be evaluated in the field conditions at different ecological zones.
摘要：
由于缺乏淡水，在污水灌溉下种植蔬菜是一种常见的做法，主要是在发展中国家。长期使用会引起土壤中重金属的积累，并最终阻碍作物的生长和生理，并恶化食物的质量。进行了一项研究，以研究油菜素类固醇（BRs）和硅（Si）对生菜的作用，菠菜,和白菜下铅（Pb）和镉（Cd）污染的污水。实验包括三种处理(对照，BRs,和Si）在生长室中的完全随机设计（CRD）下应用。BR和Si的应用导致了最高的增长，生理学,和抗氧化酶活性，当在运河水，然后是蒸馏水和污水下施用时。然而,与对照相比，BRs和Si通过减少Pb和Cd的吸收，增加了污水下的上述属性。结论:污水通过增加铅和镉对蔬菜的生长发育产生不利影响,Si和BRs的叶面喷雾可以减轻重金属的不利影响并改善生长。将在不同生态区的田间条件下评估BRs和Si的长期缓解效果。
