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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (5): 1371-1376    DOI: 10.7522/j.issn.1000-694X.2013.00201
Biology and Soil     
Effects of Heat Stress on Photosystem II in Karelinia caspica
CHEN Feng-li1,2, JIN Zheng-zhong1, LI Sheng-yu1, XU Xin-wen1, LI Lei1,2,3
1.State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China;
3.Cele National Station of Observation and Research For Desert-grass Land Ecosystem in Xinjiang, Cele 848300, Xinjiang, China
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Abstract  

To assess effect of high temperature on photosynthesis of Karelinia caspica, an experiment was conducted at the southern fringe of the Taklimakan desert. We investigated the chlorophyll a fluorescence induction kinetics underlying heat-induced inhibition of photosystem II (PSⅡ) of K. caspica after 15 min heat stress treatment. The result indicated that the maximum fluorescence (Fm), the maximum photochemical efficiency of PSⅡ (Fv/Fm), the number of active reaction centers per cross-section (RC/CSo), performance index on absorption basis (PIABS) and chlorophyll fluorescence transients changed little at 35-42 ℃, and drastically at 45-55 ℃. Moreover, at 45 ℃ showed a clear “K” step in the chlorophyll fluorescence transients of K. caspica, and become inactivity at 55 ℃. We conclude that the temperature sensitivity point of K. caspica is 45 ℃ and inactivity point is 52 ℃.

Key words:  photosystem II      chlorophyll fluorescence transient      heat stress      Karelinia caspica      Taklamakan desert     
Received:  17 August 2012      Published:  12 September 2012
ZTFLH:  Q945.79  

Cite this article: 

CHEN Feng-li1,2, JIN Zheng-zhong1, LI Sheng-yu1, XU Xin-wen1, LI Lei1,2,3. Effects of Heat Stress on Photosystem II in Karelinia caspica. JOURNAL OF DESERT RESEARCH, 2013, 33(5): 1371-1376.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00201     OR     http://www.desert.ac.cn/EN/Y2013/V33/I5/1371

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