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Sequenced ascorbate-proline-glutathione seed treatment elevates cadmium tolerance in cucumber transplants
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2018-02-22 , DOI: 10.1016/j.ecoenv.2018.02.036
Wael M. Semida , Khaulood A. Hemida , Mostafa M. Rady

During its life cycle, plant has to cope with a number of abiotic stresses including cadmium stress. Cadmium (Cd) is highly toxic to plant and greatly influences its growth and entire metabolism. Antioxidants have to enable plant to beat such stresses. Therefore, effects of ascorbate (AsA), proline (Pro) and glutathione (GSH) applied, as seed soaking solutions, singly or in a sequence on cucumber transplant growth, physio-biochemical attributes and antioxidant defense system activity were investigated under 2 mM Cd stress. Adding Cd to transplants in irrigation water reduced photosynthetic efficiency, and nutrient (K+ and Ca2+) contents, while increased the activity of defense systems (non-enzymatic and enzymatic antioxidants) and Cd2+ contents in roots and leaves. Exogenous AsA, Pro and GSH applied singly or in a sequence improved transplant growth (e.g., shoot length, leaf area, shoot fresh weight and shoot dry weight), photosynthetic efficiency (i.e., SPAD chlorophyll, Fv/Fm and PI), transplant health (i.e., increased leaf MSI and RWC, and decreased root and leaf Cd2+ contents), antioxidant defense systems activity (enzymatic; superoxide dismutase, catalase, glutathione reductase and ascorbate peroxidase, and non-enzymatic; Pro, AsA and GSH antioxidants) and nutrient (K+ and Ca2+) contents. These positive results were obtained under irrigation with or without Cd, AsA. Sequenced AsA-Pro-GSH was the best treatment of which this study recommends to use, followed by GSH treatment, for growing cucumber transplants under Cd stress.



中文翻译:

顺序抗坏血酸-脯氨酸-谷胱甘肽种子处理可提高黄瓜移植物中对镉的耐受性

在其生命周期中,植物必须应对许多非生物胁迫,包括镉胁迫。镉(Cd)对植物有剧毒,并极大地影响其生长和整个新陈代谢。抗氧化剂必须使植物能够克服这种压力。因此,在2 mM Cd下研究了抗坏血酸(AsA),脯氨酸(Pro)和谷胱甘肽(GSH)作为种子浸种溶液对黄瓜移植生长,生理生化特性和抗氧化防御系统活性的影响。压力。在灌溉水中向移植物中添加Cd会降低光合作用效率和养分(K +和Ca 2+)含量,同时会增加防御系统(非酶和酶抗氧化剂)和Cd 2+的活性。根和叶中的含量。单独或按顺序施用外源AsA,Pro和GSH可以改善移植物的生长(例如,枝条长度,叶面积,枝条鲜重和枝干重),光合效率(即SPAD叶绿素,Fv / Fm和PI),移植健康(即,提高叶片MSI和RWC,降低根和叶片Cd 2+含量),抗氧化防御系统活性(酶促;超氧化物歧化酶,过氧化氢酶,谷胱甘肽还原酶和抗坏血酸过氧化物酶,以及非酶促; Pro,AsA和GSH抗氧化剂)和养分(K +和Ca 2+) 内容。这些积极的结果是在有或没有Cd,AsA的灌溉条件下获得的。测序的AsA-Pro-GSH是本研究推荐的最佳处理方法,随后是GSH处理,用于Cd胁迫下生长的黄瓜移植。

更新日期:2018-02-22
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