The effect of PAR and temperature on the photosynthetic performance of a freshwater red alga, Thorea gaudichaudii (Thoreales) from Kagoshima, Japan

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• 作者：Ryuta Terada ; Yuki Watanabe ; Midori Fujimoto…
• 关键词：Freshwater red alga ; Photosynthesis ; Pulse amplitude ; modulated chlorophyll fluorometry ; Thorea gaudichaudii ; Thoreales
• 刊名：Journal of Applied Phycology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：28
• 期：2
• 页码：1255-1263
• 全文大小：712 KB
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• 作者单位：Ryuta Terada (1)
  Yuki Watanabe (1)
  Midori Fujimoto (1)
  Iori Tatamidani (1)
  Shogo Kokubu (1)
  Gregory N. Nishihara (2)
  
  1. Faculty of Fisheries, Kagoshima University, Kagoshima, 890-0056, Japan
  2. Institute for East China Sea Research, Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Nagasaki, 851-2213, Japan
  
• 刊物主题：Plant Sciences; Freshwater & Marine Ecology; Plant Physiology; Ecology;
• 出版者：Springer Netherlands
• ISSN：1573-5176

文摘

The effect of photosynthetically active radiation (PAR) and temperature on the photosynthesis of an endangered freshwater red alga, Thorea gaudichaudii C. Agardh (Thoreales), was determined by laboratory and field measurements. This species was found in a freshwater spring habitat that was mostly shaded from direct sunlight and under almost undetectable seasonal fluctuations in water temperature (23.0 ± 0.31 °C, ±SD). A net oxygenic photosynthesis–PAR model revealed that the net photosynthetic rate quickly saturated, with a saturating PAR (E _k) and compensation PAR (E _c) of 12 μmol photons m−2 s−1 (9–16, 95 % Bayesian credible interval (BCI)) and 7 μmol photons m−2 s−1 (5–9, 95 % BCI), respectively. A temperature-dependent (i.e., 12–44 °C range) dome-shaped model of gross photosynthesis and dark respiration was fitted to reveal that the gross photosynthetic rate, 190 μg O₂ g_ww −1 min−1 (175–208, 95 % BCI), was highest at 34.9 °C (33.5–36.0, 95 % BCI) and decreased sharply above this temperature. The dark respiration rate was also dome shaped in response to temperature, with a peak of 66 μg O₂ g_ww −1 min−1 (59–76) at 32.2 °C (28.2–40.2) and then slow decay in rates at higher temperatures. In contrast, the effective quantum yield only gradually decreased with increases in PAR and the maximum quantum yield was weakly dome shaped with respect to temperature. Indeed, the highest value of maximum quantum yield of 0.596 (0.592–0.599, 95 % BCI) occurred at 24.1 °C (22.0–26.2, 95 % BCI). This species appears to be well adapted to the heavily shaded and relatively stable temperature conditions of its environment.