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dc.contributor.authorSchaven, Kristin S.
dc.date.accessioned2013-12-15T15:29:43Z
dc.date.available2014-04-15T09:00:06Z
dc.date.issued2013-12-15
dc.identifier.urihttp://hdl.handle.net/10464/5127
dc.description.abstractPoikilohydric organisms have developed mechanisms to protect their photosynthetic machinery during times of desiccation. In hydrated conditions nonphotochemical quenching (NPQ) mechanisms are able to safely dissipate excess excitation energy as heat, but mechanisms of NPQ associated with desiccation tolerance are still largely unclear. In the lichen Parmelia sulcata, photosystem protection has been associated with an energy quenching energetically coupled to PSII and characterized by a fast-fluorescence decay lifetime, and long-wavelength emission. The present study compares the relative ability of green algae and lichens to recover photosynthetic activity after periods of desiccation using steady state fluorescence emission spectroscopy, and picosecond time-resolved fluorescence decay measurements. It was determined that desiccation induced quenching involves an antenna quenching mechanism with similar characteristics appearing in both P. sulcata and green algae. Algae isolated from lichens suggest symbiosis in the lichen appears to enhance this naturally occurring phenomenon and provide greater protection during desiccation.en_US
dc.language.isoengen_US
dc.publisherBrock Universityen_US
dc.subjectChlorophyll Fluorescence, Photosystem II, Nonphotochemical Quenching, Desiccation Toleranceen_US
dc.titleFluorescence Studies of Photosystem II Fluorescence Quenching During Desiccationen_US
dc.typeElectronic Thesis or Dissertationen_US
dc.degree.nameM.Sc. Biological Sciencesen_US
dc.degree.levelMastersen_US
dc.contributor.departmentDepartment of Biological Sciencesen_US
dc.degree.disciplineFaculty of Mathematics and Scienceen_US
dc.embargo.terms4 Monthsen_US


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