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۱Impact of Biofertilizer Trichoderma harzianum Rifai and the Biomarker Changes in Eruca Sativa L. Plant Grown in Metal–Polluted Soils
نویسنده(ها): ،
اطلاعات انتشار: World Applied Sciences Journal، بيست و دوم،شماره۲، ۲۰۱۳، سال
تعداد صفحات: ۱۰
This study was designed to elucidate the role of Trichoderma harzianum Rifai as biofertilizer for improving the Eruca sativa plant growth in the presence of metals mixture. At the same time using the changes in plant metabolism as biomarker for evaluating the toxicity of metals on plant in the presence of these biofertilizers. E. sativa plants cultivated in soil inoculated with T. harzianum as a biofertilizer and were exposed to different concentrations (50, 100 and 200 ppm) of copper and zinc mixture as sulfate salts. The fatty acidcomposition of Eruca sativa could be used as an additional biomarker of soil contaminationby metals mixture. Saturated (Palmitic and stearic acid) and unsaturated (oleic acid) fatty acid contents could be detected in the plant cultivated in soil at different treatments with T. harzianum in presence of different mixtures of copper and zinc concentrations, while other fatty acids were found to be affected by metals in the soil. Behenic acid was detected only at high concentration (100 and 200 ppm) in absence of T. harzianum inoculation. Stearic, arachidic and lignoceric acids could be detected at high concentrations with T. harzianum inoculation. Inoculation of T. harzianum in the soil improved the plant growth and minimizes the toxic effect of metals mixture. At the same time an increase in the content of chlorophyll (a) and (b) could be detected. Addition of T. harzianum to cultivated soil minimizes the absorbed amount of metals in plant, where the percentage of copper was 6.04 and 4.69% with uninoculation and inoculation of T. harzianum, respectively. On the other hand, copper and zinc mixture decreased the percentage of Mg metal in plant and +2 the addition of T. harzianum increased their percentage, where their percentage was 4.92% in presence of 100 ppm of metals mixture without T. harzianum and becoming 7.08% with T. harzianum. Exposure of Eruca sativa plant to high concentrations of metals mixture (100 ppm) without T. harzianum induced a significant increase in catalase and peroxidase enzymes activities.
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