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In Vitro and In Vivo Plant Growth Promoting Activities and DNA Fingerprinting of Antagonistic Endophytic Actinomycetes Associates with Medicinal Plants.

Passari AK, Mishra VK, Gupta VK, Yadav MK, Saikia R, Singh BP - PLoS ONE (2015)

Bottom Line: Twenty-two isolates which showed the inhibitory activity against at least one pathogen were subsequently tested for their plant-growth promoting activities and were compared genotypically using DNA based fingerprinting, including enterobacterial repetitive intergenic consensus (ERIC) and BOX repetitive elements.The two potential strains Streptomyces sp. (BPSAC34) and Leifsonia xyli (BPSAC24) were tested in vivo and improved a range of growth parameters in chilli (Capsicum annuum L.) under greenhouse conditions.These results clearly suggest the possibility of using endophytic actinomycetes as bioinoculant for plant growth promotion, nutrient mobilization or as biocontrol agent against fungal phytopathogens for sustainable agriculture.

View Article: PubMed Central - PubMed

Affiliation: Molecular Microbiology and Systematic Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India.

ABSTRACT
Endophytic actinomycetes have shown unique plant growth promoting as well as antagonistic activity against fungal phytopathogens. In the present study forty-two endophytic actinomycetes recovered from medicinal plants were evaluated for their antagonistic potential and plant growth-promoting abilities. Twenty-two isolates which showed the inhibitory activity against at least one pathogen were subsequently tested for their plant-growth promoting activities and were compared genotypically using DNA based fingerprinting, including enterobacterial repetitive intergenic consensus (ERIC) and BOX repetitive elements. Genetic relatedness based on both ERIC and BOX-PCR generates specific patterns corresponding to particular genotypes. Exponentially grown antagonistic isolates were used to evaluate phosphate solubilization, siderophores, HCN, ammonia, chitinase, indole-3-acetic acid production, as well as antifungal activities. Out of 22 isolates, the amount of indole-3-acetic acid (IAA) ranging between 10-32 μg/ml was produced by 20 isolates and all isolates were positive for ammonia production ranging between 5.2 to 54 mg/ml. Among 22 isolates tested, the amount of hydroxamate-type siderophores were produced by 16 isolates ranging between 5.2 to 36.4 μg/ml, while catechols-type siderophores produced by 5 isolates ranging from 3.2 to 5.4 μg/ml. Fourteen isolates showed the solubilisation of inorganic phosphorous ranging from 3.2 to 32.6 mg/100ml. Chitinase and HCN production was shown by 19 and 15 different isolates, respectively. In addition, genes of indole acetic acid (iaaM) and chitinase (chiC) were successively amplified from 20 and 19 isolates respectively. The two potential strains Streptomyces sp. (BPSAC34) and Leifsonia xyli (BPSAC24) were tested in vivo and improved a range of growth parameters in chilli (Capsicum annuum L.) under greenhouse conditions. This study is the first published report that actinomycetes can be isolated as endophytes from within these plants and were shown to have antagonistic and plant growth promoting abilities. These results clearly suggest the possibility of using endophytic actinomycetes as bioinoculant for plant growth promotion, nutrient mobilization or as biocontrol agent against fungal phytopathogens for sustainable agriculture.

No MeSH data available.


PCR amplification of (A) iaaM gene and (B) chiC gene for endophytic actinomycetes isolates. M: low range (100bp -3 kb) molecular marker; N: negative control; numerical numbers represents different isolates.
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pone.0139468.g002: PCR amplification of (A) iaaM gene and (B) chiC gene for endophytic actinomycetes isolates. M: low range (100bp -3 kb) molecular marker; N: negative control; numerical numbers represents different isolates.

Mentions: Out of 22 isolates 20 endophytic actinomycetes (90.9%) were positive for IAA production, among them the 14 isolates belongs to Streptomyces sp. Quantitative range of IAA production was found from 10–32 μg/ml (Table 2). Leifsonia xyli 24 and Streptomyces sp. 34 produce the most IAA, with 30.5 and 32 μg/ml, respectively. The results of PCR amplification of IAA gene demonstrated the presence of 150 bp fragment in all the 20 positive isolates (Fig 2A).


In Vitro and In Vivo Plant Growth Promoting Activities and DNA Fingerprinting of Antagonistic Endophytic Actinomycetes Associates with Medicinal Plants.

Passari AK, Mishra VK, Gupta VK, Yadav MK, Saikia R, Singh BP - PLoS ONE (2015)

PCR amplification of (A) iaaM gene and (B) chiC gene for endophytic actinomycetes isolates. M: low range (100bp -3 kb) molecular marker; N: negative control; numerical numbers represents different isolates.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4589368&req=5

pone.0139468.g002: PCR amplification of (A) iaaM gene and (B) chiC gene for endophytic actinomycetes isolates. M: low range (100bp -3 kb) molecular marker; N: negative control; numerical numbers represents different isolates.
Mentions: Out of 22 isolates 20 endophytic actinomycetes (90.9%) were positive for IAA production, among them the 14 isolates belongs to Streptomyces sp. Quantitative range of IAA production was found from 10–32 μg/ml (Table 2). Leifsonia xyli 24 and Streptomyces sp. 34 produce the most IAA, with 30.5 and 32 μg/ml, respectively. The results of PCR amplification of IAA gene demonstrated the presence of 150 bp fragment in all the 20 positive isolates (Fig 2A).

Bottom Line: Twenty-two isolates which showed the inhibitory activity against at least one pathogen were subsequently tested for their plant-growth promoting activities and were compared genotypically using DNA based fingerprinting, including enterobacterial repetitive intergenic consensus (ERIC) and BOX repetitive elements.The two potential strains Streptomyces sp. (BPSAC34) and Leifsonia xyli (BPSAC24) were tested in vivo and improved a range of growth parameters in chilli (Capsicum annuum L.) under greenhouse conditions.These results clearly suggest the possibility of using endophytic actinomycetes as bioinoculant for plant growth promotion, nutrient mobilization or as biocontrol agent against fungal phytopathogens for sustainable agriculture.

View Article: PubMed Central - PubMed

Affiliation: Molecular Microbiology and Systematic Laboratory, Department of Biotechnology, Aizawl, Mizoram University, Mizoram, 796004, India.

ABSTRACT
Endophytic actinomycetes have shown unique plant growth promoting as well as antagonistic activity against fungal phytopathogens. In the present study forty-two endophytic actinomycetes recovered from medicinal plants were evaluated for their antagonistic potential and plant growth-promoting abilities. Twenty-two isolates which showed the inhibitory activity against at least one pathogen were subsequently tested for their plant-growth promoting activities and were compared genotypically using DNA based fingerprinting, including enterobacterial repetitive intergenic consensus (ERIC) and BOX repetitive elements. Genetic relatedness based on both ERIC and BOX-PCR generates specific patterns corresponding to particular genotypes. Exponentially grown antagonistic isolates were used to evaluate phosphate solubilization, siderophores, HCN, ammonia, chitinase, indole-3-acetic acid production, as well as antifungal activities. Out of 22 isolates, the amount of indole-3-acetic acid (IAA) ranging between 10-32 μg/ml was produced by 20 isolates and all isolates were positive for ammonia production ranging between 5.2 to 54 mg/ml. Among 22 isolates tested, the amount of hydroxamate-type siderophores were produced by 16 isolates ranging between 5.2 to 36.4 μg/ml, while catechols-type siderophores produced by 5 isolates ranging from 3.2 to 5.4 μg/ml. Fourteen isolates showed the solubilisation of inorganic phosphorous ranging from 3.2 to 32.6 mg/100ml. Chitinase and HCN production was shown by 19 and 15 different isolates, respectively. In addition, genes of indole acetic acid (iaaM) and chitinase (chiC) were successively amplified from 20 and 19 isolates respectively. The two potential strains Streptomyces sp. (BPSAC34) and Leifsonia xyli (BPSAC24) were tested in vivo and improved a range of growth parameters in chilli (Capsicum annuum L.) under greenhouse conditions. This study is the first published report that actinomycetes can be isolated as endophytes from within these plants and were shown to have antagonistic and plant growth promoting abilities. These results clearly suggest the possibility of using endophytic actinomycetes as bioinoculant for plant growth promotion, nutrient mobilization or as biocontrol agent against fungal phytopathogens for sustainable agriculture.

No MeSH data available.