title: [Photosystem II characteristics of nine Gramineae species in southern Taklamakan Desert].
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 (PS II) 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 (F(m)), maximum photochemical efficiency of PS II (F(v)/F(m)), and active reaction centers per cross-section (RC/CS0), but lower values of minimum fluorescence yield (F0), absorption flux per reaction center (ABC/RC), maximal trapping flux per reaction center (TR0/RC), flux of dissipated excitation energy per reaction center (DI0/RC), and initial slope of fluorescence intensity (M0), 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 PS II 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.
authors.affiliation: State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China. llll0991@sina.com
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.forename: Xiang-yi
authors.initials: XY
authors.lastname: Li
authors.forename: Li-sha
authors.initials: LS
authors.lastname: Lin
authors.forename: Ying-ju
authors.initials: YJ
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Xue
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology*; D002681:China; D002980:Climate; D003624:Darkness; D003889:Desert Climate; D045332:Photosystem II Protein Complex / Q000378:metabolism / Q000502:physiology*; D006109:Poaceae / Q000145:classification* / Q000378:metabolism / Q000502:physiology*; D013045:Species Specificity
chemical_list: D045332:Photosystem II Protein Complex