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http://dx.doi.org/10.5532/KJAFM.2014.16.1.22

Photosynthetic Responses of Populus alba×glandulosa to Elevated CO2 Concentration and Air Temperature  

Lee, Solji (School of Ecology and Environmental System, Kyungpook National University)
Oh, Chang-Young (Department of Forest Genetic Resources, Korea Forest Research Institute)
Han, Sim-Hee (Department of Forest Genetic Resources, Korea Forest Research Institute)
Kim, Ki Woo (School of Ecology and Environmental System, Kyungpook National University)
Kim, Pan-Gi (School of Ecology and Environmental System, Kyungpook National University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.16, no.1, 2014 , pp. 22-28 More about this Journal
Abstract
This study was conducted to investigate the photosynthetic characters of Populus alba${\times}$glandulosa cuttings in response to elevated $CO_2$ concentration and air temperature for selecting tree species adaptive to climate change. The cuttings were grown in environment controlled growth chambers with two combinations of $CO_2$ concentration and air temperature conditions: (i) $22^{\circ}C$ + $CO_2$ 380 ${\mu}mol$ $mol^{-1}$ (control) and (ii) $27^{\circ}C$ + $CO_2$ 770 ${\mu}mol$ $mol^{-1}$ (elevated) for almost three months. The cuttings under the elevated treatment showed reduced tree height and photosynthetic pigment contents such as chlorophyll and carotenoid. In particular, the elevated treatment resulted in a marked reduction in the chlorophyll a closely associated with $CO_2$ fixative reaction system. Different levels of reduction in photosynthetic characters were found under the elevated treatment. A decrease was noted in photochemical reaction system parameters: net apparent quantum yield (7%) and photosynthetic electron transport rate (14%). Moreover, a significant reduction was obvious in $CO_2$ fixative reaction system parameters: carboxylation efficiency (52%) and ribulose-1,5-bisphosphate(RuBP) regeneration rate (24%). These results suggest that the low level of photosynthetic capacity may be attributed to the decreased $CO_2$ fixative reaction system rather than photochemical reaction system.
Keywords
Elevated carbon dioxide; Elevated air temperature; Global warming; Photosynthesis; Populus alba ${\times}$ glandulosa;
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