Temperature Dependency of Photosynthesis of Sphagnum spp. Distributed in the Warm-Temperate and the Cool-Temperate Mires of Japan
Akira Haraguchi, Nanae Yamada
DOI: 10.4236/ajps.2011.25086   PDF    HTML     4,884 Downloads   8,585 Views   Citations


We investigated the temperature dependency of photosynthetic rates for five Sphagnum species: Sphagnum palustre, S. fimbriatum in the Tadewara mire (south-western Japan in a warm-temperate zone) and S. papillosum, S. fuscum, S. fallax in the East Ochiishi mire (north-eastern Japan in a cool-temperate zone) measuring photosynthetic light response within a temperature range between 5 and 40C. The maximum photosynthetic rate was obtained at T = 35C for S. palustre, S. fuscum and S. papillosum, and at T = 30C for S. fimbriatum and S. fallax. Photosynthetic rates of all these species showed a maximum at 300 - 500 μmol·m-2·s-1 of PPFD and it decreased at higher PPFD (>500 μmol·m-2·s-1) under low temperature (5C - 10C). These results imply that Sphagnum species are not fully physiologically adapted to low temperature environments, although Sphagnum species distribute mostly in the circumpolar region.

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A. Haraguchi and N. Yamada, "Temperature Dependency of Photosynthesis of Sphagnum spp. Distributed in the Warm-Temperate and the Cool-Temperate Mires of Japan," American Journal of Plant Sciences, Vol. 2 No. 5, 2011, pp. 716-725. doi: 10.4236/ajps.2011.25086.

Conflicts of Interest

The authors declare no conflicts of interest.


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