Excitation energy distribution between two photosystems in Porphyra yezoensis and its significance in photosynthesis evolution  

作　　者：PAN Jie SHI Dingji CHEN Jianxin PENG Guohong ZENG Chengkui ZHANG Qiyuan 

机构地区：[1]State Key Laboratory for the Structure of Unstable and Stable Species,Center for Molecular Science,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080,China [2]Photosynthesis Research Center,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [3]Laboratory of Experimental Marine Biology,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China

出　　处：《Chinese Science Bulletin》2001年第1期49-52,共4页

基　　金：This work was supported by the State Key Basic Research and Development Plan (Grant No. 1998010100); and the National Natural Science Foundation of China (Grant Nos. 39890390 and 29733100).

摘　　要：Comparative investigation on energy distribution between two photosystems were carried out in the sporo-phytes and gametophytes of Porphyra yezoensis. By performing 77 K fluorescence spectra, we suggested that there probably existed a pathway for energy transfer from PS II to PS I to redistribute the absorbed energy in gametophytes, while no such a way or at minor level in sporophytes. Electron transfer inhibitor DCMU blocked the energy transfer from PS II to PS I in gametophytes, but no obvious effects on sporophytes. These indicated that excitation energy distribution between two photosystems in gametophytes was more cooperative than that in sporophytes. These data in ontogenesis reflected the evolution process of photosynthetic organisms and supported the hypothesis of independent evolution of each photosystem.Comparative investigation on energy distribution between two photosystems were carried out in the sporophytes and gametophytes ofPorphyra yezoensis. By performing 77 K fluorescence spectra, we suggested that there probably existed a pathway for energy transfer from PS II to PS I to redistribute the absorbed energy in gametophytes, while no such a way or at minor level in sporophytes. Electron transfer inhibitor DCMU blocked the energy transfer from PS II to PS I in gametophytes, but no obvious effects on sporophytes. These indicated that excitation energy distribution between two photosystems in gametophytes was more cooperative than that in sporophytes. These data in ontogenesis reflected the evolution process of photosynthetic organisms and supported the hypothesis of independent evolution of each photosystem.

关 键 词：EVOLUTION of PHOTOSYSTEMS excitation energy distribution PORPHYRA YEZOENSIS SPOROPHYTE and gametophyte. 

分 类 号：Q945.1[生物学—植物学]