Photosynthetica 2012, 50(1):141-151 | DOI: 10.1007/s11099-012-0014-x

Acclimation of photosynthesis in a boreal grass (Phalaris arundinacea L.) under different temperature, CO2, and soil water regimes

Z. M. Ge1,*, X. Zhou1, S. Kellomäki1, H. Peltola1, P. J. Martikainen2, K. Y. Wang1
1 School of Forest Sciences, University of Eastern Finland, Joensuu, Finland
2 Department of Environmental Science, University of Eastern Finland, Kuopio, Finland

The aim of this work was to study the acclimation of photosynthesis in a boreal grass (Phalaris arundinacea L.) grown in controlled environment chambers under elevated temperature (ambient + 3.5°C) and CO2 (700 μmol mol-1) with varying soil water regimes. More specifically, we studied, during two development stages (early: heading; late: florescence completed), how the temperature response of light-saturated net photosynthetic rate (P sat), maximum rate of ribulose-1,5-bisphosphate carboxylase/oxygenase activity (V cmax) and potential rate of electron transport (J max) acclimatized to the changed environment. During the early growing period, we found a greater temperature-induced enhancement of P sat at higher measurement temperatures, which disappeared during the late stage. Under elevated growth temperature, V cmax and J max at lower measurement temperatures (5-15°C) were lower than those under ambient growth temperature during the early period. When the measurements were done at 20-30°C, the situation was the opposite. During the late growing period, V cmax and J max under elevated growth temperature were consistently lower across measurement temperatures. CO2 enrichment significantly increased P sat with higher intercellular CO2 compared to ambient CO2 treatment, however, elevated CO2 slightly decreased V cmax and J max across measurement temperatures, probably due to down-regulation acclimation. For two growing periods, soil water availability affected the variation in photosynthesis and biochemical parameters much more than climatic treatment did. Over two growing periods, V cmax and J max were on average 36.4 and 30.6%, respectively, lower with low water availability compared to high water availability across measurement temperatures. During the late growing period, elevated growth temperature further reduced the photosynthesis under low water availability. V cmax and J max declined along with the decrease in nitrogen content of leaves as growing period progressed, regardless of climatic treatment and water regime. We suggest that, for grass species, seasonal acclimation of the photosynthetic parameters under varying environmental conditions needed to be identified to fairly estimate the whole-life photosynthesis.

Additional key words: acclimation of photosynthesis; carbon dioxide; carboxylation efficiency; electron transport; temperature; water deficit

Received: April 12, 2011; Accepted: January 9, 2012; Published: March 1, 2012  Show citation

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Ge, Z.M., Zhou, X., Kellomäki, S., Peltola, H., Martikainen, P.J., & Wang, K.Y. (2012). Acclimation of photosynthesis in a boreal grass (Phalaris arundinacea L.) under different temperature, CO2, and soil water regimes. Photosynthetica, 50(1), 141-151. doi: 10.1007/s11099-012-0014-x
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