Rizwan Muhammad, Ali Shafaqat, Hussain Afzal, Ali Qasim, Shakoor Muhammad Bilal, Zia-Ur-Rehman Muhammad, Farid Mujahid, Asma Maliha
Department of Environmental Sciences and Engineering, Government College University, Allama Iqbal Road, 38000, Faisalabad, Pakistan.
Department of Environmental Sciences and Engineering, Government College University, Allama Iqbal Road, 38000, Faisalabad, Pakistan; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
Chemosphere. 2017 Nov;187:35-42. doi: 10.1016/j.chemosphere.2017.08.071. Epub 2017 Aug 18.
Cadmium (Cd) is among the most widespread toxic trace elements found in agricultural soils due to various anthropogenic activities. The role of micronutrient-amino chelates on reducing Cd toxicity in crop plants is recently introduced. The current study was conducted to highlight the role of foliar application of zinc-lysine (Zn-lys) complex on biochemical and growth parameters and Cd uptake in wheat (Triticum aestivum) grown in aged Cd-contaminated soil. Foliar concentration of Zn-lys (0, 10, 20, and 30 mg L) was applied at different time intervals (2nd, 3rd, 5th and 7th week of sowing) and plants were harvested at maturity. Folliar application of Zinc-lys significantly increased the photosynthesis, grain yield, enzyme activities and Zn contents in different plant tissues. Zinc-lys reduced Cd contents in grains, shoot and root as well as reduced the oxidative stress in wheat linearly in a dose-additive manner. Taken together, Zn-lys chelate efficiently improved wheat growth and fortified Zn contents while reduced Cd concentration in plant in a Zn-deficient Cd-contaminated soil. Although, health risk index (HRI) from the soil sampling area seems to be lower than <1 for Cd but may exceed due to long-term consumption of grains produced from such contaminated soil. Foliar applied Zn-lys reduced HRI which may help to reduce health risks associated with Cd.
由于各种人为活动，镉（Cd）是农业土壤中分布最广泛的有毒微量元素之一。近年来，人们开始关注微量营养素-氨基酸螯合物在降低作物镉毒性方面的作用。本研究旨在探讨叶面喷施锌-赖氨酸（Zn-lys）络合物对老化镉污染土壤中小麦（Triticum aestivum）生化和生长参数以及镉吸收的影响。在不同时间间隔（播种后第2、3、5和7周）喷施不同浓度（0、10、20和30 mg L）的Zn-lys，成熟时收获植株。叶面喷施锌-赖氨酸显著提高了不同植物组织的光合作用、籽粒产量、酶活性和锌含量。锌-赖氨酸以剂量加和的方式线性降低了籽粒、地上部和根部的镉含量以及小麦的氧化应激。综上所述，在缺锌镉污染土壤中，Zn-lys螯合物有效促进了小麦生长，增加了锌含量，同时降低了植株中的镉浓度。虽然土壤采样区域的健康风险指数（HRI）对于镉似乎低于<1，但由于长期食用受此类污染土壤生产的谷物，该指数可能会超过安全值。叶面喷施Zn-lys降低了HRI，这可能有助于降低与镉相关的健康风险。
