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Characterization of bacterial diversity and ice-nucleating ability during different monsoon seasons over a southern tropical Indian region
M. Akila, Hema Priyamvada, Raghunathan Ravikrishna,
Published in Elsevier Ltd
2018
Volume: 191
   
Pages: 387 - 394
Abstract
Bioaerosols abundantly found in the atmosphere can potentially influence the climate by acting as ice nuclei and thus profoundly influencing the hydrological cycle. As the first attempt over India, we report the diversity, abundance, and ice nucleating ability of bacteria present in the rainwater collected at Chennai, during summer and two contrasting monsoon seasons. Diverse bacterial communities were present in all the twenty rainwater samples and predominantly belonged to Actinobacteria (6%), Alpha proteobacter (9%), Bacilli (29%), Betaproterobacteria (14%), Flavobacteria (3%), and Gammaproteobacteria (39%). The most efficient ice nucleating bacteria such as Pseudomonas sp. and Pantoea sp. were present in our precipitation samples and they contributed to 8.4% and 9.4% of the total cultivable bacterial species obtained. The relative abundance of Pseudomonas was highest during the south-west monsoon (75%) whereas Pantoea was abundant in the north-east monsoon (51.8%). The dominant bacteria belonging to the known ice nucleating genera Pseudomonas, Pantoea, and Bacillus were chosen for the determination of their freezing temperatures using tube freeze assay technique. The onset freezing temperature of species belonging to Pseudomonas and Pantoea was recorded as −12 °C and for those species belonging to Bacillus it was found to be −14 °C. Further, the number of bacterial cells making up an ice nucleus was estimated at the temperatures ranging from −18 °C to −12 °C for all the ice nucleating bacteria and it was found to vary from 106 to 109 (cells/nucleus). © 2018 Elsevier Ltd
About the journal
JournalData powered by TypesetAtmospheric Environment
PublisherData powered by TypesetElsevier Ltd
ISSN13522310
Open AccessNo
Concepts (58)
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    Aerosols
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    Atmospheric thermodynamics
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    Bacteriology
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    Freezing
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    Ice
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    Tropics
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    Bioaerosols
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    Freezing temperatures
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    GAMMAPROTEOBACTERIA
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    HYDROLOGICAL CYCLES
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    Indian monsoon
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    PANTOEA
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    PRECIPITATION SAMPLES
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    Pseudomonas
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    Bacteria
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    Rain
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    Aerosol
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    Bacterium
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    Microbial activity
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    Monsoon
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    Nucleation
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    RAINWATER
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    Relative abundance
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    Species diversity
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    Temperature
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    TROPICAL REGION
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    Actinobacteria
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    ALPHAPROTEOBACTERIA
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    Article
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    BACILLI
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    Bacillus
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    Bacterial cell
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    BACTERIUM IDENTIFICATION
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    BETAPROTEROBACTERIA
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    FLAVOBACTERIA
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    GAMMAPROTEOBACTERIA
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    ICE NUCLEATING BACTERIUM
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    India
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    Microbial community
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    MICROBIAL DIVERSITY
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    MONSOON SEASON
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    Nonhuman
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    PANTOEA
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    Precipitation
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    Priority journal
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    Season
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    Summer
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    WATER SAMPLING
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    CHENNAI
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    Tamil nadu
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    BACILLI (CLASS)
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    BACILLUS (BACTERIUM)
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    Bacteria (microorganisms)
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    FLAVOBACTERIA
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    GAMMAPROTEOBACTERIA
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    PANTOEA
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    PANTOEA SP.
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    Pseudomonas sp.