Toxic effects of arsenic on Sinorhizobium–Medicago sativa symbiotic interaction

Pajuelo, Eloísa; Rodríguez‐Llorente, Ignacio D.; Dary, Mohammed; Palomares, Antonio J.

doi:10.1016/j.envpol.2007.10.015

Cited by 126 publications

(51 citation statements)

References 39 publications

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“…Similarly, metal tolerance by Rhizobium, Bradyrhizobium and Azotobacter (Pajuelo et al, 2008) and varying level of resistance among other PGPR (Bacillus and Pseudomonas) have also been reported (Yilmaz, 2003;Thacker et al, 2007;Wasi et al, 2008). Environ.…”

Section: Resultsmentioning

confidence: 99%

Bioreduction of Cr (VI) by Heavy Metal Resistant Pseudomonas Species

Wani¹,

Ayoola²

2015

J. of Environmental Science and Technology

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Chromium (VI) contamination has accelerated due to rapid industrialization worldwide. Aim of this study was to check the bacterial species for their tolerance towards multiple metals, antibiotics and further check whether these bacteria are reducing Cr (VI). Bacterial strains were isolated from the industrial area situated at Lagos-Abeokuta Road, Ile Ise Awo, Abeokuta, Ogun State, Nigeria. All of the isolates showed tolerance to lead, zinc and chromium (VI). Bacterial species also showed tolerance towards antibiotics, 100% of strains were resistant to ampicillin, cotrimoxazole, colistin and gentamycin, 66.6% to nitrofurantoin and nalidixic acid, 83.3% were resistant to streptomycin whereas, 50% were resistant to tetracycline. Among all the strains, only two strains Pseudomonas strain PH2 and PH4 were chosen for chromium (VI) reduction as these strains showed maximum tolerance towards chromium (VI). Maximum reduction (60%) of chromium (VI) was observed at pH 6 by Pseudomonas spp. PH2, which was followed by pH 5 (50%) whereas, pH9 showed least reduction of 12.5%. Similarly, Pseudomonas spp. PH4 also reduced chromium considerably at pH 6 (60%), pH 5 (50%), pH 8 (37.5%) and at pH 9 (12.5%) respectively, at a concentration of 100 μg Cr mLG 1 after 120 h of incubation. The Pseudomonas species PH2 reduced chromium (VI) at concentration of 50 μg Cr mLG 1 (92%), 100 μg Cr mLG 1 (70%) and 150 μg Cr mLG 1 (50%), respectively at a pH of 6. Similarly, Pseudomonas species PH4 reduced chromium (VI) by 95% at 50 μg Cr mLG 1 , 70% at 100 μg Cr mLG 1 and 55% at 150 μg Cr mLG 1 at a pH of 6. Due to above properties strains could therefore, be used as bioremediators of metals in soils contaminated with heavy metals and can also increase the yield of various crops under heavy metal contamination.

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Section: Resultsmentioning

confidence: 99%

Bioreduction of Cr (VI) by Heavy Metal Resistant Pseudomonas Species

Wani¹,

Ayoola²

2015

J. of Environmental Science and Technology

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“…Furthermore, recent investigation by Pajuelo et al [15] demonstrated that a decreased number of root hairs and infection thread were affected drastically in the early step of nodulation.…”

Section: Resultsmentioning

confidence: 98%

“…Finally, Rhizobiumlegume symbiosis as an efficient system for soil nitrogen improvement. A few Rhizobium strains tolerant to arsenic toxicity and symbiotically effective have been reported [14,15]. We have previously isolated one Rhizobium strain, VMA301, from the root nodules of Vigna mungo, grown in arsenic contaminated field and characterized its several aspects to arsenic toxicity [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Arsenic on Nodulation and Nitrogen Fixation of Blackgram (Vigna mungo)

Mandal

Gouri

et al. 2011

Indian J Microbiol

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Rhizobium-legume symbiotic interaction is an efficient model system for soil remediation and reclamation. We earlier isolated an arsenic (As) (2.8 mM arsenate) tolerant and symbiotically effective Rhizobium strain, VMA301 from Vigna mungo and in this study we further characterized its efficacy for arsenic removal from the soil and its nitrogen fixation capacity. Although nodule formation is delayed in plants with As-treated composite when the inoculum was prepared without arsenic in culture medium, whereas it attains the significant number of nodules compare to plant grown in As-free soil when the inoculum was prepared with arsenic supplemented medium. Arsenic accumulation was higher in roots than root nodules. Nitrogenase activity is reduced to almost 2 fold in plants with As-treated soil but not abolished. These results suggest that this strain, VMA301, has been able to establish an effective symbiotic interaction in V. mungo in As-contaminated soil and can perform dual role of arsenic bioremediation as well as soil nitrogen improvement.

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Section: + 2+mentioning

confidence: 99%

Chromium (Vi) Reduction by Streptococcus Species Isolated from the Industrial Area of Abeokuta, Ogun State, Nigeria

Wani¹,

Zainab²,

Wasiu³

et al. 2015

Research J. of Microbiology

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Chromium (VI) contamination has accelerated due to rapid industrialization worldwide. Aim of this study is to check the bacterial species for their tolerance towards multiple metals, antibiotics and plant growth promoting activity and further check whether these bacteria are reducing Cr (VI). Bacterial strains were isolated from metal contaminated soils of Abeokuta. All of the isolates showed tolerance to lead, zinc and chromium (VI). Bacterial specie also showed tolerance towards antibiotics, 100% of the isolates were tolerant to Septrin, Chloramphenicol, Sparfloxacin, Amoxicillin, Augmentin, Tarivid and Streptomycin, whereas 83.33% were tolerant to Gentamycin and Pefloxacin and 33.33% were resistant to Ciprofloxacin. All bacterial species were positive to ammonia, whereas strain PZ3 and PZ4 were found to be positive to HCN. Among all the strains, only Streptococcus spp. PZ4 showed reduction of Chromium (VI). Maximum reduction (85%) of chromium (VI) was observed at pH 7 by Streptococcus spp. PZ4. Similarly, Streptococcus spp. PZ4 reduced the chromium considerably at pH 5 (51.25%), pH 6 (72.5%), pH 8 (67.5%) and at pH 9 (45%), at a concentration of 100 µg Cr mLG after 120 h of incubation. Streptococcus spp. PZ4 1 reduced chromium (VI) at a concentration of 50 µg Cr mLG (47.5%), 100 µg Cr mLG (91.25%) and 1 1 150 µg Cr mLG (134.17%). Due to above properties strains could therefore be used a s 1 bioremediators of metals in soils contaminated with heavy metals and can also increase the yield of various crops under heavy metal contamination.

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Toxic effects of arsenic on Sinorhizobium–Medicago sativa symbiotic interaction

Cited by 126 publications

References 39 publications

Bioreduction of Cr (VI) by Heavy Metal Resistant Pseudomonas Species

Bioreduction of Cr (VI) by Heavy Metal Resistant Pseudomonas Species

Effect of Arsenic on Nodulation and Nitrogen Fixation of Blackgram (Vigna mungo)

Chromium (Vi) Reduction by Streptococcus Species Isolated from the Industrial Area of Abeokuta, Ogun State, Nigeria

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