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Interspecies variation in survival and growth of filamentous heterotrophic bacteria in response to UVC radiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
29676 44429 2011 9 PDF Available
Title
Interspecies variation in survival and growth of filamentous heterotrophic bacteria in response to UVC radiation
Abstract

Ultraviolet radiation is an important environmental constraint on the evolution of life. In addition to its harmful effects, ultraviolet radiation plays an important role in generating genetic polymorphisms and acting as a selective agent. Understanding how prokaryotes cope with high radiation can give insights on the evolution of life on Earth. Four representative filamentous bacteria from the family Cytophagaceae with different pigmentation were selected and exposed to different doses of UVC radiation (15–32,400 J m−2). The effect of UVC radiation on bacterial survival, growth and morphology were investigated. Results showed high survival in response to UVC for Rudanella lutea and Fibrisoma limi, whereas low survival was observed for Fibrella aestuarina and Spirosoma linguale. S. linguale showed slow growth recovery after ultraviolet exposure, R. lutea and F. limi showed intermediate growth recovery, while F. aestuarina had the fastest recovery among the four tested bacteria. In terms of survival, S. linguale was the most sensitive bacterium whereas R. lutea and F. limi were better at coping with UVC stress. The latter two resumed growth even after 2 h exposure (∼10,800 J m−2). Additionally, the ability to form multicellular filaments after exposure was tested using two bacteria: one representative of the high (R. lutea) and one of the low (F. aestuarina) survival rates. The ability to elongate filaments due to cell division was preserved but modified. In R. lutea 10 min exposure reduced the average filament length. The opposite was observed in F. aestuarina, where the 5 and 10 min exposures increased the average filament length. R. lutea and F. limi are potential candidates for further research into survival and resistance to ultraviolet radiation stress.

► Effect of UVC on survival, growth and morphology differed in a family of filamentous bacteria. ► Survival rates and growth were affected by the duration of UVC exposure. ► Two species were able to resume growth even after 2 h UVC exposure (∼10,800 J m−2). ► Multicellular filamentation ability was preserved but modified.

Keywords
UVC radiation; Filamentous bacteria; Cytophagaceae; Growth; Resistance
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Interspecies variation in survival and growth of filamentous heterotrophic bacteria in response to UVC radiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 103, Issue 3, 2 June 2011, Pages 234–242
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us