A Comparative Study on Function and Membrane Proteins of Chloroplasts of Three Species of Cephalotaxus in Late Winter |
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Authors: | Ma Hong Zhang Zheng-Dong Li Liang-Bi Ma Gui-Zhi Zhai Xiao-Jing Zhou Pei-Zhen |
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Abstract: | Three species of evergreen Cephalotaxus (C. fortunei Hook. f., C. sinensis Li andC. harringtonia cv. Fastigiata) were used as materials to study some functional properties ofchloroplasts. It is found that the oxygenevolving capacity of the chloroplasts from these plantsis inhibited but partial reaction of PS-II and effect of Mg2+ on energy distribution betweentwo photosystems are detectable during the winter. Seasonal effects on the functional propertiesof chloroplasts from evergreen Cephalotaxus are similar to that of conifer chloroplasts. The ratio between F685, F695 and F735 of fluorescence emission spectra at 77°K of chloroplasts is different among these three species. It is found by using SDS-PAGE that the number of polypeptide resolved from thylakoid membrane of C. harringtonia cv. Fastigiata substantially differs from that of C. fortunei Hook.f. and C. sinensis Li. The result shows that thefluorescence emission spectrum feature and polypeptide composition of thylakoid membrane maybe used as a tool for systematics of the genus Cephalotaxus. |
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Keywords: | Cephalotaxus Photosystem I Photosystem II variable fluorescence low temperature fluorescene chloroplast polypeptide |
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