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Augmentation of metal tolerant bacteria elevate growth and reduce metal toxicity in Spinach.

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Title Augmentation of metal tolerant bacteria elevate growth and reduce metal toxicity in Spinach.
 
Creator 37. Renu S , Khan Sarim, Upasana Sahu, Manish Bhoyar, Dhananjaya Singh, Udai Singh, Asha Sahu, Amrita Gupta, Asit Mandal, Jyoti Thakur & M. Manna
 
Subject Bioremediation; heavy metal; heavy metal-tolerant bacteria; minimum inhibitory concentration; plant growth promotion; toxicity
 
Description Not Available
Heavy metal contamination poses a serious threat to both the ecosystem and human and
requires expensive cleanup costs. Bioremediation based on microorganisms, plants, or other
biological systems offers cost-effective and environment friendly metal clean-up methods.
Studies on bacterial diversity in heavy metal contaminated sites have demonstrated a high
diversity of microorganisms that are adapted to the new environment. Bacteria that are
resistant to and grow on metals play an important role in the biogeochemical cycling of
those metal ions. In pursuit to identify bacteria that are tolerant to different heavy metals
and can have a potential in bioremediation, surveys, and collection of samples from several
presumptive heavy metal-polluted sites of India were carried out. A total of 77 bacterial
morphotypes were obtained, and based on minimum inhibitory concentrations (MIC) of different
heavy metals, that is Pbþ2, Niþ2, Cdþ2, Crþ3, Hgþ2, Cuþ2, Znþ2, Coþ2, and Asþ2, thirteen
potential bacterial isolates were identified possessing very high and multiple heavy
metal tolerance like arsenic (50–1100mg kg 1), lead (100–2000mg kg 1), chromium
(250–500mg kg 1), cadmium (50–100mg kg 1), and other heavy metals. All potential bacteria
were morphologically characterized, identified based on the 16 s rRNA gene sequences,
and studied for plant growth promoting attributes. Bacterial strains were found to be phosphate
solubilizers, siderophore and ammonia producers, and nitrate reducers. Bacillus cereus
MB1, Bacillus amyloliquefaciens RD4, Bacillus megaterium MF7, and E. cloacae MC4 were evaluated
for alleviation of As, Cr, Ni, and Pb toxicity, respectively in spinach. The inoculation of
plants with respective heavy metal-tolerant bacteria under study gave higher records of all
estimated growth parameters, total chlorophyll content and antioxidant enzyme, superoxide
dismutase, activity and differential response in proline biosynthesis when compared to
respective uninoculated heavy metal controls. Overall selected plant growth-promoting
heavy metal-tolerant bacterial inoculations were found to promote growth and reduce the
respective heavy metal toxicity in spinach plant. Since heavy metal contamination in agricultural
lands is becoming serious environmental concern, the heavy metal-tolerant plant
growth-promoting strains reported in this study can offer suitable economical and ecofriendly
base for development of the bioremediation strategies.
Not Available
 
Date 2023-09-19T10:03:13Z
2023-09-19T10:03:13Z
2020-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/80535
 
Language English
 
Relation Not Available;
 
Publisher Taylor and Francis