应用生态学报2011，Vol.22Issue(10)：2599-2603,5.
塔克拉玛干沙漠南缘9种禾本科牧草光系统Ⅱ特性
Photosystem Ⅱ characteristics of nine Gramineae species in southern Taklamakan Desert
摘要
Abstract
Taking the Gramineae species Elytrigia intermedia, Avena sativa, Bromus inermis, Ely-mus 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 H ) 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 PS II (Fy/Fm), and active reaction centers per cross-section (RC/Csa), but lower values of minimum fluorescence yield (Fo) , 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.关键词
光系统Ⅱ/叶绿素荧光参数/牧草/塔克拉玛干沙漠Key words
PSII / chlorophyll fluorescence parameter/ pasture/ Taklamakan Desert.分类
农业科技引用本文复制引用
李磊,李向义,林丽莎,王迎菊,薛伟..塔克拉玛干沙漠南缘9种禾本科牧草光系统Ⅱ特性[J].应用生态学报,2011,22(10):2599-2603,5.基金项目
新疆维吾尔自治区科技计划项目(200933125)资助. （200933125）
