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Rhizobacteria and plant symbiosis in heavy metal uptake and its implications for soil bioremediation

机译：重金属摄取的根瘤菌和植物共生及其对土壤生物修复的影响

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摘要

Certain species of plants can benefit from synergistic effects with plant growth-promoting rhizobacteria (PGPR) that improve plant growth and metal accumulation, mitigating toxic effects on plants and increasing their tolerance to heavy metals. The application of PGPR as biofertilizers and atmospheric nitrogen fixators contributes considerably to the intensification of the phytoremediation process. In this paper, we have built a system consisting of rhizospheric Azotobacter microbial populations and Lepidium sativum plants, growing in solutions containing heavy metals in various concentrations. We examined the ability of the organisms to grow in symbiosis so as to stimulate the plant growth and enhance its tolerance to Cr(VI) and Cd(II), to ultimately provide a reliable phytoremediation system. The study was developed at the laboratory level and, at this stage, does not assess the inherent interactions under real conditions occurring in contaminated fields with autochthonous microflora and under different pedoclimatic conditions and environmental stresses. Azotobacter sp. bacteria could indeed stimulate the average germination efficiency of Lepidium sativum by almost 7%, average root length by 22%, average stem length by 34% and dry biomass by 53%. The growth of L. sativum has been affected to a greater extent in Cd(II) solutions due its higher toxicity compared to that of Cr(VI). The reduced tolerance index (TI, %) indicated that plant growth in symbiosis with PGPR was however affected by heavy metal toxicity, while the tolerance of the plant to heavy metals was enhanced in the bacteria-plant system.
机译：某些种类的植物可以从植物生长促进的根瘤菌（PGPR）中受益于改善植物生长和金属积累，减轻对植物的毒性作用并增加对重金属的耐受性。 PGPR作为生物元体和大气氮固定剂的应用有很大贡献植物化方法的增强。在本文中，我们建立了一种由根茎偶氮杆菌微生物种群和唾液植物组成的系统，在含有各种浓度的重金属的溶液中生长。我们检查了生物体在共生中生长的能力，以刺激植物生长，并增强其对Cr（VI）和CD（II）的耐受性，最终提供可靠的植物修复体系。该研究在实验室水平开发，在此阶段，不评估在污染的田间发生的真实条件下的固有相互作用，并在不同的小细胞条件和环境应力下进行污染的田间发生。 Azotobacter sp。细菌确实可以刺激唾液酸肝肝的平均萌发效率近7％，平均根长度为22％，平均茎长34％，干生物量为53％。与Cr（VI）相比，L.Sativum的生长受到CD（II）溶液的更大程度的影响。降低的耐受性指数（Ti，％）表明，PGPR的植物生长受到重质金属毒性的影响，而在细菌 - 植物系统中，植物对重金属的耐受性得到增强。

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  • 来源
    《New biotechnology》 |2017年第1期|共10页
  • 作者

    Sobariu Dana Luminita; Fertu Daniela Ionela Tudorache; Diaconu Mariana; Pavel Lucian Vasile; Hlihor Raluca-Maria; Dragoi Elena Niculina; Curteanu Silvia; Lenz Markus; Corvinid Philippe Francois-Xavier; Gavrilescu Maria;

  • 作者单位

    Gheorghe Asachi Tech Univ Iasi Fac Chem Engn &

    Environm Protect Dept Environm Engn &

    Management 73 Prof Dr D Docent Mangeron St Iasi 700050 Romania;

    Gheorghe Asachi Tech Univ Iasi Fac Chem Engn &

    Environm Protect Dept Environm Engn &

    Management 73 Prof Dr D Docent Mangeron St Iasi 700050 Romania;

    Gheorghe Asachi Tech Univ Iasi Fac Chem Engn &

    Environm Protect Dept Environm Engn &

    Management 73 Prof Dr D Docent Mangeron St Iasi 700050 Romania;

    Gheorghe Asachi Tech Univ Iasi Fac Chem Engn &

    Environm Protect Dept Environm Engn &

    Management 73 Prof Dr D Docent Mangeron St Iasi 700050 Romania;

    Gheorghe Asachi Tech Univ Iasi Fac Chem Engn &

    Environm Protect Dept Environm Engn &

    Management 73 Prof Dr D Docent Mangeron St Iasi 700050 Romania;

    Gheorghe Asachi Tech Univ Iasi Fac Chem Engn &

    Environm Protect Dept Chem Engn 73 Prof Dr D Docent Mangeron St Iasi 700050 Romania;

    Gheorghe Asachi Tech Univ Iasi Fac Chem Engn &

    Environm Protect Dept Chem Engn 73 Prof Dr D Docent Mangeron St Iasi 700050 Romania;

    Univ Appl Sci &

    Arts Northwestern Switzerland Inst Ecopreneurship Sch Life Sci Gruendenstr 40 CH-4132 Muttenz Switzerland;

    Univ Appl Sci &

    Arts Northwestern Switzerland Inst Ecopreneurship Sch Life Sci Gruendenstr 40 CH-4132 Muttenz Switzerland;

    Gheorghe Asachi Tech Univ Iasi Fac Chem Engn &

    Environm Protect Dept Environm Engn &

    Management 73 Prof Dr D Docent Mangeron St Iasi 700050 Romania;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 普通生物学;
  • 关键词

    Azotobacter sp.; Cadmium; Chromium; Lepidium sativum; Rhizobacteria; Tolerance;

    机译：偶氮杆菌sp。;镉;铬;Lepidium sativum;relizobacteria;耐受性;

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