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Chinese Journal of Applied Ecology ›› 2011, Vol. 22 ›› Issue (10): 2599-2603.

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Photosystem  Ⅱ characteristics of nine Gramineae  species in southern Taklamakan Desert.

LI Lei1,2,3, LI Xiang-yi1,3, LIN Li-sha1,3, WANG Ying-ju1,2,3, XUE Wei1,2,3   

  1. 1State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3Xinjiang Cele National Field Scientific Observation and Research Station of Desertification and Grassland Ecosystem, Cele 848300, Xinjiang, China
  • Online:2011-10-18 Published:2011-10-18

Abstract: Taking the Gramineae species Elytrigia intermedia, Avena sativa, Bromus inermis, Elymus sibiricus, Leymus tianschanicus, Elymus dahuricus, Festuca elata, Agropyron cristatum, and Puccinellia distans at the edge of Cele Oasis in southern Taklimakan Desert as test objects, this paper monitored their fast chlorophyll fluorescence kinetics after 20 minutes adaptation in darkness, compared their photosystem Ⅱ (PSⅡ) characteristics, and analyzed their adaptability to the local environment. Among the nine Gramineae species, L. tianschanicus and E. dahuricus had markedly higher values of maximum fluorescence yield (Fm), maximum photochemical efficiency of PSⅡ (Fv/Fm), and active reaction centers per cross-section (RC/CSo), but lower values of minimum fluorescence yield (Fo), absorption flux per reaction center (ABC/RC), maximal trapping flux per reaction center (TRo/RC), flux of dissipated excitation energy per reaction center (DIo/RC), and initial slope of fluorescence intensity (Mo), as compared to F. elata, A. cristatum, and P. distans, whereas E. intermedia, A. sativa, B. inermis, and E. sibiricus had a medium level of the values. These results suggested that all the test pasture species were suffered from the severe environmental conditions of Cele Oasis to some extent, as indicated by the inactivation of PSⅡ reaction center and the depression of electron transport chain. L. tianschanicus and E. dahuricus were least impacted, while F. elata, A. cristatum, and P. distans were most impacted.