scholarly journals Heavy metal accumulation and antioxidant properties of Nephrolepis biserrata growing in heavy metal-contaminated soil

2015 ◽  
Vol 17 (3) ◽  
pp. 544-554 ◽  
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Defense Mechanisms ◽  
Antioxidant Properties ◽  
Heavy Metal Stress ◽  
Industrial Area ◽  
Heavy Metal Accumulation ◽  
Metal Stress ◽  
Contaminated Site ◽  
Soil P

<div> <p>Antioxidant defense mechanisms are crucial for plants to survive under stress conditions. We investigated the capacity of a wild fern species, <em>Nephrolepis biserrata,</em> growing in the vicinity of industrial land to accumulate heavy metals, and assessed its antioxidative response under metal stress. The soils in this particular area were highly contaminated with zinc followed by lead and copper. As control, <em>N. biserrata</em> located 10 km away from the industrial area were collected and assessed. <em>N. biserrata</em> from the contaminated sites accumulated metals in their tissues in similar descending order of zinc&gt;lead&gt;copper. The values of bioaccumulation factor between 0 to 0.1 indicate <em>N. biserrata</em> as a moderate accumulator for the tested metals. For the enzymatic antioxidant assays, the activities of catalase and ascorbate peroxidase were significantly higher in <em>N. biserrata</em> from contaminated soil compared to control, while the activity of superoxide dismutase was not differ significantly in plants from both sites. We also detected higher contents of total phenolics and total flavonoids in <em>N. biserrata</em> collected from contaminated site compared to control. Our HPLC analysis revealed higher levels of myricetin and kaempferol in plant samples from the contaminated area. Our study verified the capacity of <em>N. biserrata</em> to scavenge oxygen radicals when exposed to heavy metal stress. Such ability to tolerate stressful condition suggests that the plant is a potential metal phytoremediator.&nbsp;</p> </div> <p>&nbsp;</p>

scholarly journals Melatonin Confers Heavy Metal Tolerance of a Dark Septate Endophyte (DSE) Exophiala Pisciphila Via Lowering Oxidative Stress and Heavy Metal Accumulation

2020 ◽  
Author(s):  
Yang Yu ◽  
Zhaowei Teng ◽  
Zongmin Mou ◽  
Yan Lv ◽  
Tao Li ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Heavy Metal ◽  
Metal Accumulation ◽  
Metal Tolerance ◽  
Heavy Metal Tolerance ◽  
Heavy Metal Stress ◽  
Heavy Metal Accumulation ◽  
Metal Stress ◽  
Dark Septate Endophyte ◽  
Exophiala Pisciphila

Abstract Background: The high antioxidant capacity of melatonin contributing to heavy metal tolerance for plants and animals is widely studied, while researches on microorganisms especially in filamentous fungi are rare. One typical dark septate endophyte (DSE), Exophiala pisciphila, showed significant resistance to heavy metals.Results: In this study, exogenous melatonin was verified to reduce heavy metal damage via relieving oxidative stress, activating antioxidant systems, and decreasing heavy metal accumulation in E. pisciphila. Melatonin biosynthesis enzyme genes were upregulated under heavy metal stress. Furthermore, the overexpression of E. pisciphila TDC1 (EpTDC1) and E. pisciphila ASMT1 (EpASMT1) responsible for melatonin biosynthesis in Escherichia coli and Arabidopsis thaliana, enhanced heavy metal stress tolerance for the two organisms by lowering the oxidative stress and reducing the Cd accumulation in the whole plants, especially in the roots.Conclusions: Our results indicate that melatonin confers heavy metal resistance in E. pisciphila by lowering oxidative stress and heavy metal accumulation.

scholarly journals Arbuscular Mycorrhizal Fungi as Potential Agents in Ameliorating Heavy Metal Stress in Plants

Agronomy ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 815 ◽  
Author(s):  
Rajni Dhalaria ◽  
Dinesh Kumar ◽  
Harsh Kumar ◽  
Eugenie Nepovimova ◽  
Kamil Kuča ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Environmental Pollutants ◽  
Arbuscular Mycorrhizal ◽  
Heavy Metal Stress ◽  
Antioxidant Response ◽  
Heavy Metal Accumulation ◽  
Metal Stress

Heavy metal accumulation in plants is a severe environmental problem, rising at an expeditious rate. Heavy metals such as cadmium, arsenic, mercury and lead are known environmental pollutants that exert noxious effects on the morpho-physiological and biological attributes of a plant. Due to their mobile nature, they have become an extended part of the food chain and affect human health. Arbuscular mycorrhizal fungi ameliorate metal toxicity as they intensify the plant’s ability to tolerate metal stress. Mycorrhizal fungi have vesicles, which are analogous to fungal vacuoles and accumulate massive amount of heavy metals in them. With the help of a pervasive hyphal network, arbuscular mycorrhizal fungi help in the uptake of water and nutrients, thereby abating the use of chemical fertilizers on the plants. They also promote resistance parameters in the plants, secrete a glycoprotein named glomalin that reduces the metal uptake in plants by forming glycoprotein–metal complexes, and improve the quality of the soil. They also assist plants in phytoremediation by increasing the absorptive area, increase the antioxidant response, chelate heavy metals and stimulate genes for protein synthesis that reduce the damage caused by free radicals. The current manuscript focuses on the uptake of heavy metals, accumulation, and arbuscular mycorrhizal impact in ameliorating heavy metal stress in plants.

Effects of Metal Stress on Visible/Near-Infrared Reflectance Spectra of Vegetation

2011 ◽  
Vol 347-353 ◽  
pp. 2735-2738 ◽  
Author(s):  
Guang Yu Chi ◽  
Yi Shi ◽  
Xin Chen ◽  
Jian Ma ◽  
Tai Hui Zheng
Keyword(s):  
Heavy Metal ◽  
Structural Changes ◽  
Near Infrared ◽  
Leaf Surface ◽  
Spectral Response ◽  
Spectral Characteristics ◽  
Surface Characteristics ◽  
Heavy Metal Stress ◽  
Metal Stress ◽  
Near Infrared Reflectance

Vegetation which suffers from heavy metal stresses can cause changes of leaf color, shape and structural changes. The spectral characteristics of vegetation leaves is related to leaf thickness, leaf surface characteristics, the content of water, chlorophyll and other pigments. So the eco-physiology changes of plants can be reflected by spectral reflectance. Studies on the spectral response of vegetation to heavy metal stress can provide a theoretical basis for remote sensing monitoring of metal pollution in soils. In recent decades, there are substantial amounts of literature exploring the effects of heavy metals on vegetation spectra.

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