Microbial populations and enzyme activity in soil treated with heavy metals

Hemida, S. K.; Omar, S. A.; Abdel-Mallek, A. Y.

doi:10.1007/bf02406152

Cited by 51 publications

(34 citation statements)

References 36 publications

(26 reference statements)

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“…The viable amounts of bacteria, fungi, and actinomycetes in this experiment fluctuated with increasing of nickel concentration in soil, which may be related to the test method. When using a selective media, these results ought to belong to normal data (Hemida et al, 1997;Scragg, 1999). Therefore, phytoextraction made soil microbial species more abundant and microbial populations much higher.…”

Section: Discussionmentioning

confidence: 96%

Response of microbial communities to phytoremediation of nickel contaminated soils

Cai

Qiu

Chen

et al. 2007

Front. Agric. China

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Through pot experiment, effects of phytoremediation on microbial communities in soils at different nickel treatment levels were studied. Two Ni hyperaccumulating and one Ni tolerant species were planted in paddy soils different in Ni concentration, ranging from 100 to 1 600 mg/kg. After 110 days of incubation, soil microbial activities were analyzed. Results showed that populations of bacteria, fungus, and actinomycetes and biomass of the microorganisms were stimulated when nickel was added at a rate of 100 mg/kg in non-rhizospheric soil. When the rate was over 100 mg/kg in the soil, adverse effects on the soil microbial communities were observed. The plantation of Ni hyperaccumulating species could increase both the population and biomass of soil microorganisms, because, by absorbing nickel from the soil and excreting root exudates, the plants reduced nickel toxicity and improved the living environment of the microbes. However, different plant species had different effects on microorganisms in soil.Randomly Amplified Polymorphic DNA (RAPD) with five primers was used in this study in 25 soil samples of four types of soils. A total of 947 amplified bands were obtained, including 888 polymorphic bands and 59 non-polymorphic bands. The results indicated that the composition of microbial DNA sequences had changed because of the addition of nickel to the treated soils. Shannon-Weaver index of soil microbial DNA sequences reduced in the nickel contaminated soils with increasing nickel concentration. The changes in ShannonWeaver index in the four types of soils ranged from 1.65 to 2.32 for Alyssum corsicum, 1.37 to 2.27 for Alyssum murale, 1.37 to 1.96 for Brassica juncea, and 1.19 to 1.85 for nonrhizospheric soil. With the same amount of nickel added to soils, the Shannon-Weaver index in rhizospheric soil with plants was higher than that in non-rhizospheric soil.

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Section: Discussionmentioning

confidence: 96%

Response of microbial communities to phytoremediation of nickel contaminated soils

Cai

Qiu

Chen

et al. 2007

Front. Agric. China

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“…2). One might suspect that metals should result in lower rather than higher enzyme activities (Kuperman and Carreiro, 1997) by causing protein denaturation, forming a complex with the substrate, interacting with the residues involved in enzyme function, or by reacting with the enzymeesubstrate complex (Hemida et al, 1997). However, after having conducted the control experiments where metals were added to the enzymatic assays and the ability of the soil itself to act as an inhibitor or activator was assessed, it is clear that the metals or the soil themselves are not simply activating the enzymes studied and that something else must be responsible for the high enzymatic activities observed at site 146.…”

Section: Discussionmentioning

confidence: 99%

Effect of metal contamination on microbial enzymatic activity in soil

Hagmann

Goodey

Mathieu

et al. 2015

Soil Biology and Biochemistry

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“…For instance, lead may persist in soil for about 150-5,000 years, while the average biological half-life of cadmium has been reported as 18 years (Forstner 1995). Apart from the effects of heavy metals on plants, numerous studies have also shown that long-term accumulation of heavy metal in soils deleteriously affects community diversity including those of denitrifying community (Sobolev and Begonia 2008) or soil microbial activities (Doelman and Haanstra 1984;Hemida et al 1997;Solanki and Dhankhar 2011) including those of hydrogenase activity of Rhizobium leguminosarum biovar viciae (Ureta et al 2005). For example, in a study, the impact of aluminum and heavy metals such as copper, iron, and molybdenum on growth and activity of enzymes of fast-and slow-growing rhizobial species was determined (Arora et al 2010).…”

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confidence: 99%

Toxic Effects of Heavy Metals on Germination and Physiological Processes of Plants

Wani

Khan

Zaidi

2012

Toxicity of Heavy Metals to Legumes and Bioremediation

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Pollution of the environment by toxic metals in recent years has accelerated dramatically due to rapid industrial progress. Heavy metals when taken up in amounts in excess of the normal concentration produce lethal effects on plants, on microbes, and directly or indirectly on the human health. Deleterious impact of metals on plants includes the reduction in germinability of seeds, inactivation of enzymes, damage to cells by acting as antimetabolites, or formation of precipitates or chelates with essential metabolites. Heavy metals also show unconstructive effects on other physiological processes like photosynthesis, gaseous exchange, water relations, and mineral/nutrient absorption by plants. These adverse effects may be due to the generation of reactive oxygen species which may cause oxidative stress. The impact of heavy metals on germination of legume seeds and different physiological events of plants with special reference to leguminous plants grown in distinct agroecological niches is highlighted.

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Microbial populations and enzyme activity in soil treated with heavy metals

Cited by 51 publications

References 36 publications

Response of microbial communities to phytoremediation of nickel contaminated soils

Response of microbial communities to phytoremediation of nickel contaminated soils

Effect of metal contamination on microbial enzymatic activity in soil

Toxic Effects of Heavy Metals on Germination and Physiological Processes of Plants

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