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Permanent link (DOI): https://doi.org/10.7939/R34J0B430

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Seasonal photosynthetic activity in evergreen conifer leaves monitored with spectral reflectance Open Access

Descriptions

Other title
Subject/Keyword
Photochemical Reflectance Index (PRI)
Acclimation
Cold Stress
Chlorophyll Fluorescence
Pigments
Conifers
Photosynthesis
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wong, Christopher Yet San
Supervisor and department
Gamon, John (Earth and Atmospheric Sciences)
Examining committee member and department
Hik, David (Biological Sciences)
Vinebrooke, Rolf (Biological Sciences)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2014-03-31T13:24:45Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
Annual trends of the Photochemical Reflectance Index (PRI) and pigment content in evergreen conifer leaves were monitored over two years from 2011 to 2013. During the second year, chlorophyll fluorescence and gas exchange were included to examine the spring recovery of photosynthesis. All the metrics indicated large seasonal changes in photosynthetic activity, with a sharp transition in the spring and a more gradual transition in the autumn. The PRI was primarily driven by changes in carotenoid:chlorophyll pigment levels (constitutive processes) that correlated with seasonal photosynthetic activity, with a much smaller variation caused by diurnal changes in xanthophyll cycle activity (facultative processes). Additionally, a previously unrecognized shift in spectral reflectance also affected the PRI under deep cold temperatures. Together, these findings indicate that evergreen conifers photosynthetic system possesses a remarkable degree of resilience in response to large temperature changes across seasons, and that optical remote sensing can be used to observe the seasonal effects on photosynthesis and productivity.
Language
English
DOI
doi:10.7939/R34J0B430
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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