Huan Luo, Chipeng Zhang, Shunyuan Zhang, Wansheng Song, Han Chen
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引用次数: 0
Abstract
Wheat could become poisoned when grown in soil with high arsenic (As) content. It is worthwhile to investigate the potential use of sulfur (S) and selenium (Se) for crop protection while detoxifying heavy metal(loid)s. In this study, a pot experiment was conducted under both single and combined application of the two elements. Their effects on wheat growth were analyzed based on As distribution in subcellular tissues and the variation in physiological and biochemical indicators. Despite wheat absorbing and enriching As under S and Se application, its growth status improved. Cell wall and vacuole sequestered majority of elevated As. Phytochelatins (PCs) content increased significantly in the roots, particularly when Se was applied alone. They could chelate with As using thiol groups. Superoxide dismutase (SOD) activity was found to be considerably lower in leaves and without any discernible increase in roots. Peroxidase (POD) activity in roots/stems and/or catalase (CAT) activity in stems increased, and exerted antioxidant effects. The leaf was well protected, and its chlorophyll content significantly increased. The application of S alone had a relatively weaker effect on reducing As content in grains, but the mixed application of Se could induce an inhibitory effect.
在砷(As)含量较高的土壤中种植小麦可能会中毒。研究硫(S)和硒(Se)在解毒的同时保护作物的潜力是值得的。在本研究中,我们进行了一次盆栽实验,实验条件是单一施用和联合施用这两种元素。根据 As 在亚细胞组织中的分布以及生理生化指标的变化,分析了这两种元素对小麦生长的影响。尽管小麦在施用 S 和 Se 的情况下吸收并富集了 As,但其生长状况有所改善。细胞壁和液泡螯合了大部分升高的 As。根部的植物螯合素(PCs)含量显著增加,尤其是在单独施用 Se 的情况下。它们可以利用硫醇基与砷螯合。研究发现,叶片中的超氧化物歧化酶(SOD)活性明显降低,而根中的活性没有明显提高。根/茎中的过氧化物酶(POD)活性和/或茎中的过氧化氢酶(CAT)活性增加,发挥了抗氧化作用。叶片受到很好的保护,叶绿素含量明显增加。单独施用 S 对降低谷物中 As 含量的作用相对较弱,但混合施用 Se 可产生抑制作用。
期刊介绍:
Ecotoxicology and Environmental Safety is a multi-disciplinary journal that focuses on understanding the exposure and effects of environmental contamination on organisms including human health. The scope of the journal covers three main themes. The topics within these themes, indicated below, include (but are not limited to) the following: Ecotoxicology、Environmental Chemistry、Environmental Safety etc.