Document Detail


Preliminary evidence on photoreactivation of Frankia spores with visible light after exposure to UV-C radiation.
MedLine Citation:
PMID:  21715279     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Spores of four Frankia strains, the nitrogen-fixing actinomycete, were exposed to short wavelength UV-C radiation of 254 nm at 1 lux cm2 (0.24 mw cm2 of energy) for 10 min. The used strains were HFP020203, UGL020604, UGL020602q and ORS021001. Exposure to UV was followed by reactivation with visible white light at 327.4 lux cm2 for the same period of time. Spore germination percentage, spore protein content, and cell growth were damaged by this treatment. The lower and higher percentages of reduction in spore germination were 32 and 63% and, for the same strains, the recovery by white light was 7.2 and 37%. The lower percentages of UV damage and subsequent low recovery were recorded for strain ORS021001 that is considered more resistant to UV than the other strains. The higher percentages were recorded for strain HFP020203 that is more sensitive to UV but having more efficient repairing mechanisms. All the tested strains showed repairing activity induced by white light as indicated from the increase in their spore germination, protein content and almost restoring the normal shape of Frankia hyphae, after being damaged, as revealed by scanning electron microscope. This is the first evidence that photo-repairing systems are present in Frankia strains although there are variations in their response to both UV-C and photoreactivation by white light.
Authors:
W F Sayed
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta microbiologica et immunologica Hungarica     Volume:  58     ISSN:  1217-8950     ISO Abbreviation:  Acta Microbiol Immunol Hung     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-06-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9434021     Medline TA:  Acta Microbiol Immunol Hung     Country:  Hungary    
Other Details:
Languages:  eng     Pagination:  93-103     Citation Subset:  IM    
Affiliation:
South Valley University Department of Botany, Faculty of Science Qena Egypt.
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