Laboratoire des Plantes Extrêmphiles, Centre de Biotechnologies, Technopole Borj Cedria, Hammam Lif, Tunisia.
J Hazard Mater. 2011 Jul 15;191(1-3):373-9. doi: 10.1016/j.jhazmat.2011.04.092. Epub 2011 May 6.
Organic wastes were successfully used as soil amendment to improve agrosystems productivity. Yet, the effectiveness of this practice to enhance plant antioxidant capacities has received little attention. Here, we assess the effect of municipal solid waste (MSW) compost (at 40 t ha(-1)) on growth, polyphenol contents and antioxidant activities of Mesembryanthemum edule. MSW compost application significantly increased the soil contents of carbon, nitrogen, calcium, phosphorus and potassium. This was associated with higher nutrient (N, P, and K) uptake, which likely led to the significant improvement of the plant biomass and relative growth rate (RGR) (+93% on average) as compared to the control. In the same way, the fertilizing effect of the added organic matter significantly enhanced the antioxidant potential M. edule, assessed by radical scavenging activity, iron reducing power and β-carotene bleaching capacity. This was associated with significantly higher antioxidant contents, mainly total phenols and flavonoids. Heavy metal (Pb, Cd, Cu, and Zn) concentrations were slightly increased upon compost application, but remained lower than phytotoxic values. Overall, our results point out that short-term MSW compost application at 40 t ha(-1) is efficient in enhancing the productivity together with the antioxidant potentiality of M. edule without any adverse environmental impact.
有机废物被成功地用作土壤改良剂来提高农业系统的生产力。然而，这种做法对增强植物抗氧化能力的有效性却很少受到关注。在这里，我们评估了城市固体废物（MSW）堆肥（40 t ha(-1))对生石花（Mesembryanthemum edule）生长、多酚含量和抗氧化活性的影响。MSW 堆肥的应用显著增加了土壤中碳、氮、钙、磷和钾的含量。这与更高的养分（N、P 和 K）吸收有关，这可能导致植物生物量和相对生长率（RGR）显著提高（平均提高 93%），与对照相比。同样，添加有机物的施肥效应显著增强了生石花的抗氧化潜力，通过自由基清除活性、铁还原能力和β-胡萝卜素漂白能力来评估。这与显著更高的抗氧化含量有关，主要是总酚类和类黄酮。堆肥应用后重金属（Pb、Cd、Cu 和 Zn）浓度略有增加，但仍低于植物毒性值。总的来说，我们的结果表明，短期 40 t ha(-1)的 MSW 堆肥应用在提高生产力的同时，不会对环境造成任何不利影响，还能增强生石花的抗氧化能力。
