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Influence of mycorrhizae fungies on photosynthetic pigments of Thymus daenensis medicinal plant in a soil contaminated with heavy metals
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Zeynab Mohkami *   , Fatemeh Bidarnamani , Hasan Ghorbani Ghozhdi , Zahra Ghaffari Moghadam |
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Abstract: (4250 Views) |
Abstract
Introduction: Using plants is one of the new and low cost methods for refining contaminated soils (Phytoremediation). Phytoremediation is an emerging technology that utilizes plants and microorganisms found in rhizosphere used to delete, modify or limit the toxic chemicals in soil, sediments, groundwater, surface water and even the atmosphere. Therefore, aim of this project is effect investigation of phytoremediation ability of Thymus daenensis medicinal plant symbiotic with mycorrhizae fungi on photosynthetic pigments in polluted soils of lead and cadmium.
Materials and Methods: This experiment was conducted in a factorial based on randomized complete design with three replications at greenhouse of Agricultural Institute of Zabol University. The first factor was four levels of heavy metals (control (zero), lead (100 mg/kg), cadmium (15 mg/kg) and lead + cadmium) and the second factor was fungal treatments in five levels (control (non-inoculated), G. intraradices, G. Mosseae, G. fasciculatum and combination of all three species.
Results: The results showed that different treatments containing lead and cadmium heavy metals and mycorrhizael fungi have significant effect on chlorophyll a, chlorophyll index and carotenoids; while there was no significant effect on chlorophyll b. According to the results, maximum amount of chlorophyll a (0.354 mg/g FW) was obtained in control (non-application of heavy metals and mycorrhizae symbiosis), maximum of chlorophyll index (0.39 mg/g FW) was observed in treatment of polluted soil by cadmium and inoculated with G. fasiculatum and high level of carotenoids (1.95 mg/g FW) was obtained in contaminated soil with lead and inoculated with three fungus spices.
Conclusion: The results of this study showed that mycorrhizae fungus had a significant effect on the concentration of lead and cadmium in shoots and roots of Thymus daenensis medicinal plant. In general, symbiosis with mycorrhizael fungi improved the toxicant effects of heavy metals on photosynthetic pigments and reduces their toxicity.
Keywords: Photosynthetic pigments, Heavy metals, Mycorrhizael fungi, Phytoremediation |
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Full-Text [PDF 1156 kb]
(1108 Downloads)
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Type of Study: Research |
Subject:
Ecophysiology
Received: 2017/11/20 | Accepted: 2017/11/20 | Published: 2017/11/20
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