title: ASSESSMENT OF PHOTOSYNTHETIC PERFORMANCE OF PORPHYRA YEZOENSIS (BANGIALES, RHODOPHYTA) IN CONCHOCELIS PHASE(1).
abstract: Photosynthetic characteristics of four Porphyra yezoensis Ueda [a taxonomic synonym of Pyropia yezoensis (Ueda) M. S. Hwang et H. G. Choi] strains in conchocelis phase were investigated and compared with one wildtype of P. yezoensis and two strains of Porphyra haitanensis T. J. Chang et B. F. Zheng [a taxonomic synonym of Pyropia haitanensis (T. J. Chang et B. F. Zheng) N. Kikuchi et M. Miyata]. Results showed that experimental strains had higher contents of chl a and carotenoids, but a lower content of total phycobiliproteins than the wildtype. Meanwhile, photochemical efficiency of PSII was measured using pulse amplitude modulation (PAM) fluorometry technology. The value of PSII photosynthetic parameters of P. yezoensis strains were all higher than the wild strain, and the maximal quantum yields (Fv /Fm ), effective quantum yields Y(II), and relative photosynthetic electron transport rates (rETR) of P. haitanensis were higher than those of P. yezoensis. The present study verified the possibility of selective breeding of P. yezoensis using the filamentous sporophyte instead of the gametophytic thallus, the advantages being (i) nonrequirement of control of life cycle and (ii) direct and rapid cultivar improvement by artificial selection. We consider the method to be a promising technique for selective breeding of P. yezoensis cultivars.
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, ChinaShandong Marine Fisheries Research Institute, Yantai 264006, ChinaChangshu Institute of Technology, Changshu 215500, ChinaQingdao University of Science & Technology, Qingdao 266042, China Qingdao Agricultural University, Qingdao 266109, China Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Xu
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, ChinaShandong Marine Fisheries Research Institute, Yantai 264006, ChinaChangshu Institute of Technology, Changshu 215500, ChinaQingdao University of Science & Technology, Qingdao 266042, China Qingdao Agricultural University, Qingdao 266109, China Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
authors.forename: Hongjin
authors.initials: H
authors.lastname: Qiao
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, ChinaShandong Marine Fisheries Research Institute, Yantai 264006, ChinaChangshu Institute of Technology, Changshu 215500, ChinaQingdao University of Science & Technology, Qingdao 266042, China Qingdao Agricultural University, Qingdao 266109, China Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
authors.forename: Jianyi
authors.initials: J
authors.lastname: Zhu
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, ChinaShandong Marine Fisheries Research Institute, Yantai 264006, ChinaChangshu Institute of Technology, Changshu 215500, ChinaQingdao University of Science & Technology, Qingdao 266042, China Qingdao Agricultural University, Qingdao 266109, China Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
authors.forename: Pu
authors.initials: P
authors.lastname: Xu
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, ChinaShandong Marine Fisheries Research Institute, Yantai 264006, ChinaChangshu Institute of Technology, Changshu 215500, ChinaQingdao University of Science & Technology, Qingdao 266042, China Qingdao Agricultural University, Qingdao 266109, China Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
authors.forename: Chengwei
authors.initials: C
authors.lastname: Liang
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, ChinaShandong Marine Fisheries Research Institute, Yantai 264006, ChinaChangshu Institute of Technology, Changshu 215500, ChinaQingdao University of Science & Technology, Qingdao 266042, China Qingdao Agricultural University, Qingdao 266109, China Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, ChinaShandong Marine Fisheries Research Institute, Yantai 264006, ChinaChangshu Institute of Technology, Changshu 215500, ChinaQingdao University of Science & Technology, Qingdao 266042, China Qingdao Agricultural University, Qingdao 266109, China Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
authors.forename: Naihao
authors.initials: N
authors.lastname: Ye
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, ChinaShandong Marine Fisheries Research Institute, Yantai 264006, ChinaChangshu Institute of Technology, Changshu 215500, ChinaQingdao University of Science & Technology, Qingdao 266042, China Qingdao Agricultural University, Qingdao 266109, China Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China.
authors.forename: Wanxin
authors.initials: W
authors.lastname: Yang
keywords: Porphyra yezoensis Ueda; conchocelis; light absorption; photosynthetic efficiency of PSII; pigment composition