UBC Undergraduate Research

The effects of environmental changes on the photosynthesis and transpiration rates for the evergreen and deciduous trees during the spring and summer season Sekhon, Harleen


In this study, the photosynthesis and transpiration rates of two evergreen tree species: Thuja plicata (Western Red Cedar), Chamaecyparis lawsoniana (Lawson Cypress); and two deciduous tree species: Acer rubrum (Red Maple), Quercus rubra (Red Oak) were compared using the Licor photosynthesis System and an Infra-red Gas Analyzer (IRGA). The morphological, physiological and biochemical analyses were conducted during the spring and summer season. Environmental factors such as light intensity, temperature and precipitation were also recorded. The leaf samples were also subjected to gel electrophoresis for protein profiling, and the SDS gels for all the samples showed significant expression in the protein Rubisco (ribulose-1,5 bisphosphate carboxylase/oxygenase) and moderate expressions in the light-harvesting complex proteins. The average photosynthesis rate was highest in the Red Oak species and typically lowest in the Evergreen Lawson Cypress species. The average transpiration rate was just the opposite. These research findings will contribute information on plant sustainability based on the species, and the role of plants in CO₂ sequestration. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”

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