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Two bacterial strains isolated from a Zn-polluted soil enhance plant growth and mycorrhizal efficiency under Zn-toxicity.
Chemosphere. 2006 Mar; 62(9):1523-33.C

Abstract

In this study we investigated the interactions among plant, rhizosphere microorganisms and Zn pollution. We tested the influence of two bacterial strains isolated from a Zn-polluted soil on plant growth and on the symbiotic efficiency of native arbuscular mycorrhizal fungi (AMF) under Zn toxicity. The two bacterial strains exhibited Zn tolerance when cultivated under increasing Zn levels in the medium. However, strain B-I showed a higher Zn tolerance than strain B-II at the two highest Zn levels in the medium (75 and 100 mg l(-1) Zn). Molecular identification placed the strain B-I within the genus Brevibacillus. Our results showed that bacterial strain B-I consistently enhanced plant growth, N and P accumulation, as well as nodule number and mycorrhizal infection which demonstrated its plant-growth promoting (PGP) activity. This strain B-I has been shown to produce IAA (3.95 microg ml) and to accumulate 5.6% of Zn from the growing medium. The enhanced growth and nutrition of plants dually inoculated with the AMF and bacterium B-I was observed at three Zn levels assayed. This effect can be related to the stimulation of symbiotic structures (nodules and AMF colonization) and a decreased Zn concentration in plant tissues. The amount of Zn acquired per root weight unit was reduced by each one of these bacterial strains or AMF and particularly by the mixed bacterium-AMF inocula. These mechanisms explain the alleviation of Zn toxicity by selected microorganisms and indicate that metal-adapted bacteria and AMF play a key role enhancing plant growth under soil Zn contamination.

Authors+Show Affiliations

Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Prof. Albareda, 1, 18008 Granada, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16098559

Citation

Vivas, A, et al. "Two Bacterial Strains Isolated From a Zn-polluted Soil Enhance Plant Growth and Mycorrhizal Efficiency Under Zn-toxicity." Chemosphere, vol. 62, no. 9, 2006, pp. 1523-33.
Vivas A, Biró B, Ruíz-Lozano JM, et al. Two bacterial strains isolated from a Zn-polluted soil enhance plant growth and mycorrhizal efficiency under Zn-toxicity. Chemosphere. 2006;62(9):1523-33.
Vivas, A., Biró, B., Ruíz-Lozano, J. M., Barea, J. M., & Azcón, R. (2006). Two bacterial strains isolated from a Zn-polluted soil enhance plant growth and mycorrhizal efficiency under Zn-toxicity. Chemosphere, 62(9), 1523-33.
Vivas A, et al. Two Bacterial Strains Isolated From a Zn-polluted Soil Enhance Plant Growth and Mycorrhizal Efficiency Under Zn-toxicity. Chemosphere. 2006;62(9):1523-33. PubMed PMID: 16098559.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Two bacterial strains isolated from a Zn-polluted soil enhance plant growth and mycorrhizal efficiency under Zn-toxicity. AU - Vivas,A, AU - Biró,B, AU - Ruíz-Lozano,J M, AU - Barea,J M, AU - Azcón,R, Y1 - 2005/08/10/ PY - 2005/04/25/received PY - 2005/06/15/revised PY - 2005/06/22/accepted PY - 2005/8/16/pubmed PY - 2006/4/15/medline PY - 2005/8/16/entrez SP - 1523 EP - 33 JF - Chemosphere JO - Chemosphere VL - 62 IS - 9 N2 - In this study we investigated the interactions among plant, rhizosphere microorganisms and Zn pollution. We tested the influence of two bacterial strains isolated from a Zn-polluted soil on plant growth and on the symbiotic efficiency of native arbuscular mycorrhizal fungi (AMF) under Zn toxicity. The two bacterial strains exhibited Zn tolerance when cultivated under increasing Zn levels in the medium. However, strain B-I showed a higher Zn tolerance than strain B-II at the two highest Zn levels in the medium (75 and 100 mg l(-1) Zn). Molecular identification placed the strain B-I within the genus Brevibacillus. Our results showed that bacterial strain B-I consistently enhanced plant growth, N and P accumulation, as well as nodule number and mycorrhizal infection which demonstrated its plant-growth promoting (PGP) activity. This strain B-I has been shown to produce IAA (3.95 microg ml) and to accumulate 5.6% of Zn from the growing medium. The enhanced growth and nutrition of plants dually inoculated with the AMF and bacterium B-I was observed at three Zn levels assayed. This effect can be related to the stimulation of symbiotic structures (nodules and AMF colonization) and a decreased Zn concentration in plant tissues. The amount of Zn acquired per root weight unit was reduced by each one of these bacterial strains or AMF and particularly by the mixed bacterium-AMF inocula. These mechanisms explain the alleviation of Zn toxicity by selected microorganisms and indicate that metal-adapted bacteria and AMF play a key role enhancing plant growth under soil Zn contamination. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/16098559/Two_bacterial_strains_isolated_from_a_Zn_polluted_soil_enhance_plant_growth_and_mycorrhizal_efficiency_under_Zn_toxicity_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(05)00878-7 DB - PRIME DP - Unbound Medicine ER -