Bioaccumulation of Heavy Metals by Zinc Resistant Bacteria Isolated from Agricultural Soils Irrigated with Wastewater

Ahemad, Munees; Malik, Abdul

doi:10.3923/bj.2012.12.21

Cited by 138 publications

(59 citation statements)

References 21 publications

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“…auxin, cytokinins, ethylene, and abscisic acid and giberelins (Ahemad 2012). Indirectly, PGPR minimize or prevent the harmful effects of pathogenic organisms (Ahemad & Malik 2011), moreover, mobilize the nutrients in soils and improve the soil structure (Ahemad & Malik 2011). Inoculation of agricultural crops with PGPR results in multiple positive effects on plant, e.g.…”

Section: Introductionmentioning

confidence: 99%

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfoliumMill.)

Hassan

David

Bashir³

2014

Journal of Plant Interactions

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The study aimed to identify and select important plant growth-promoting rhizobacteria (PGPR) and examine the response of tomato growth upon inoculation. Inoculation with rhizobacterial isolates increased all the measured physical, chemical, and enzymatic growth parameters compared to control. However, the TAN1 isolate had the highest effect, and significantly (P < 0.05) increased the root length (8.25-fold), root fresh (8.36-fold) and dry (12.6-fold) weight, shoot length (6.92-fold), shoot fresh (7.18-fold) and dry (6.90-fold) weight, number of leaves (11.0-fold), chlorophyll a (6.25-fold), chlorophyll b (10.7-fold), carotenoid contents (8.80-fold), seedlings fresh (9.0-fold) and dry (8.71-fold) weight, plant macronutrient uptake, i.e. N (7.7-and 8.9-fold), P (10.5-and 11.4-fold), K (7.8-and 8.8-fold), , and Mg (12.6-and 9-fold) in shoot and root, plant micronutrient uptake, i.e. Zn (6.6-, 10.2-), Cu (9.3-, and 10.3-fold), Fe (7.7-and 10.7-fold), and Mn (4.7-and 5.7-fold) in shoot and root and plant antioxidant enzymes, i.e. glutathione S-transferase (10.7-fold), peroxidase (8.1-fold), and catalase (10.5-fold). Our results concluded that inoculation of agricultural crops with rhizobacteria is a very useful approach to increase the plant growth. The rhizobacteria having both 1-aminocyclopropane-1-carboxylate (ACC) deaminase and nitrogen-fixing activity are more effective than rhizobacteria possessing either ACC-deaminase or nitrogen-fixing activity alone for growth promotion of crops.Keywords: PGPR; ACC-deaminase; nitrogen fixation; ethylene and auxin; tomato IntroductionPlant growth-promoting rhizobacteria (PGPR) are free living microorganisms having beneficial effects on plants by colonizing their roots (Ahemad 2012). PGPR promote the plant growth by several direct and indirect ways (Ahemad 2012). Directly, PGPR provide the bacterium-synthesized compounds to the plants, facilitate the nutrient availability and uptake and production of certain phytohormones, e.g. auxin, cytokinins, ethylene, and abscisic acid and giberelins (Ahemad 2012). Indirectly, PGPR minimize or prevent the harmful effects of pathogenic organisms (Ahemad & Malik 2011), moreover, mobilize the nutrients in soils and improve the soil structure (Ahemad & Malik 2011). Inoculation of agricultural crops with PGPR results in multiple positive effects on plant, e.g. increase in the plant growth and vigor, increment in the chlorophyll, protein, proline, and antioxidant enzymes (e.g. peroxidase (POX), catalase, and glutathione reductase) activity that increase the plant immunity (Sahran & Nehra 2011). It has been observed that increased activity of antioxidant enzymes is correlated with resistance, against both biotic and abiotic stresses, in many plant species (Jan et al. 2011).At present, the use of microorganisms with the aim of improving crop production on sustainable basis has increased tremendously in various parts of the world (Glick 2012). This is due to the emerging demand for dependence diminishing of synthetic chemical products, to the grow...

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Section: Introductionmentioning

confidence: 99%

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfoliumMill.)

Hassan

David

Bashir³

2014

Journal of Plant Interactions

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“…However, in the present study, minimum inhibitory concentration against lead, cadmium and nickel was recorded to be 1200, 900 and 800 ppm respectively. Due to great affinity for various metal ions, microorganisms actively accumulate metals 16 and store them in different places like cell wall, carbohydrate and protein polyphosphate complex 10 . Table 1 shows the ability of the selected bacterial strain, A. phenanthrenivorans B2, to remediate heavy metals.…”

Section: Resultsmentioning

confidence: 99%

An Alternative Approach of Toxic Heavy Metal Removal by <i>Arthrobacter phenanthrenivorans</i>:Assessment of Surfactant Production and Oxidative Stress

et al. 2016

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The present study demonstrates the removal of three toxic heavy metals (lead, cadmium and nickel) by the bacterial strain Arthrobacter phenanthrenivorans from polluted water. The removal efficiency of heavy metals was recorded to be highest in case of lead (79.91%), followed by nickel (47.62%) and cadmium (34.05%). Furthermore, surfactant production by A. phenanthrenivorans was optimized, which is useful for different purposes like metal and oil removal from water. Partial characterization of the semi-purified surfactant was done for thermal stability, pH tolerance and metal ions sensitivity. Antioxidant enzyme activity (catalase and superoxide dismutase) and stress marker-malondialdehyde level were also determined in the presence of these three heavy metals.

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“…They stimulate plant growth through mobilizing nutrients in soils, producing numerous plant growth regulators, enhance resistance to stress, stabilize soil aggregates, and improve soil structure and organic matter content (Ahemad, 2012;Ahemad and Malik, 2011;Hayat et al, 2010;Rajkumar et al, 2010 andBraud et al, 2009). Indeed, the bacteria lodging around/in the plant roots (rhizobacteria) are more versatile in transforming, mobilizing, solubilizing the nutrients compared to those from bulk soils (Hayat et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of Fungal Bacterial Interactions as Biofilmed Biofertilizers on Enhancement of Root Growth of Hevea Seedlings

Hettiarachchi

Dharmakeerthi

Jayakody

et al. 2014

J Environ Prof Sri Lanka

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Bioaccumulation of Heavy Metals by Zinc Resistant Bacteria Isolated from Agricultural Soils Irrigated with Wastewater

Cited by 138 publications

References 21 publications

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfoliumMill.)

ACC-deaminase and/or nitrogen-fixing rhizobacteria and growth response of tomato (Lycopersicon pimpinellfoliumMill.)

An Alternative Approach of Toxic Heavy Metal Removal by <i>Arthrobacter phenanthrenivorans</i>:Assessment of Surfactant Production and Oxidative Stress

Effectiveness of Fungal Bacterial Interactions as Biofilmed Biofertilizers on Enhancement of Root Growth of Hevea Seedlings

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