The UV responses of bacterioneuston and bacterioplankton isolates depend on the physiological condition and involve a metabolic shift

FEMS Microbiology Ecology
Ana L SantosÂngela Cunha

Abstract

Bacteria from the surface microlayer (bacterioneuston) and underlying waters (bacterioplankton) were isolated upon exposure to UV-B radiation, and their individual UV sensitivity in terms of CFU numbers, activity (leucine and thymidine incorporation), sole-carbon source use profiles, repair potential (light-dependent and independent), and photoadaptation potential, under different physiological conditions, was compared. Colony counts were 11.5-16.2% more reduced by UV-B exposure in bacterioplankton isolates (P < 0.05). Inhibition of leucine incorporation in bacterioneuston isolates was 10.9-11.5% higher than in bacterioplankton (P < 0.05). These effects were accompanied by a shift in sole-carbon source use profiles, assessed with Biolog(®) EcoPlates, with a reduction in consumption of amines and amino acids and increased use of polymers, particularly in bacterioneuston isolates. Recovery under starvation was generally enhanced compared with nourished conditions, especially in bacterioneuston isolates. Overall, only insignificant increases in the induction of antibiotic resistant mutant phenotypes (Rif(R) and Nal(R) ) were observed. In general, a potential for photoadaptation could not be detected among the tested isolates. Thes...Continue Reading

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Citations

Oct 24, 2012·Archives of Microbiology·Ana L SantosÂngela Cunha
Oct 3, 2012·Journal of Photochemistry and Photobiology. B, Biology·Ana L SantosÂngela Cunha
Nov 11, 2015·Environmental Pollution·Jacinta M M OliveiraInês Domingues
Jan 8, 2018·Environmental Science and Pollution Research International·Javier Moreno-AndrésEnrique Nebot
Mar 16, 2013·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Ana L SantosAngela Cunha

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