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Effect of Extracellular Factors on Growth and Dimorphism of Rhizopus oryzae with Multiple Enzyme Synthesizing Ability

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Abstract

Rhizopus oryzae PR7 MTCC 9642 was a dimorphic fungus that showed a regular 90 days cycle of filament (mycelium) to pellet (yeast) transformation through a distinct bottom dwelling intermediate state and the pellets never revert back to filamentous form. Apart from the normal cycle, high temperature (37°C and above) and extreme pH also induced the yeast formation. Among the ions tested, calcium and chloride ions were found to restore the filamentous morphology, even in extreme pH and temperature. Cysteine HCl also played noteworthy role in maintaining mycelial growth even at adverse condition. Immobilized spores showed the appearance of intermediate form instead of typical yeast form even at high temperature. The strain could produce a number of extracellular hydrolytic enzymes like cellulolytic, xylanolytic, pectinolytic and amylolytic enzymes. The pellet and mycelial forms were found to be a better producer of cellulase–lignocellulase enzymes and amylolytic enzymes respectively, which might be correlated with their infectivity. Increase in inoculum size, agitation during cultivation, change in carbon and nitrogen source failed to induce mycelial growth in extreme conditions, which might be explained as irreversible change of configuration of protein responsible for mycelial development.

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Acknowledgment

The authors wish to thank the University Grants Commission, New Delhi for the financial assistance.

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Authors and Affiliations

  1. Microbiology Research Laboratory, Post Graduate Department of Zoology, Molecular Biology and Genetics, Presidency University, 86/1, College Street, Kolkata, 700 073, India

    Moumita Karmakar, Barnita Ghosh & Rina Rani Ray

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  1. Moumita Karmakar
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  2. Barnita Ghosh
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  3. Rina Rani Ray
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Correspondence to Rina Rani Ray.

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Karmakar, M., Ghosh, B. & Ray, R.R. Effect of Extracellular Factors on Growth and Dimorphism of Rhizopus oryzae with Multiple Enzyme Synthesizing Ability. Indian J Microbiol 52, 215–221 (2012). https://doi.org/10.1007/s12088-011-0197-z

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  • DOI: https://doi.org/10.1007/s12088-011-0197-z

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