Defensive physiological characters of Pyropia yezoensis resistant lines to the red rot disease

查看全文 作　　者：ZOU [1,2]Dandan;TANG [1,2]Xianghai;QIU [1,2]Liping;MAO [1,2]Yunxiang

机构地区：[1]College of Marine Life Sciences,Ocean University of China,Qingdao 266003,China;[2]Key Laboratory of Marine Genetics and Breeding of Ministry of Education,Ocean University of China,Qingdao 266003,China

出　　处：《Journal of Oceanology and Limnology》索引2020年第38卷第2期,共8页

基　　金：Supported by the National Natural Science Foundation of China(Nos.31372517,41006082) 摘　　要：To explore ef fective physiological indexes to distinguish the resistant lines and susceptible lines of Pyt hium porphyrae,the causal agent of red rot disease of Pyropia yezoensis,and establish the disease-resistance breeding strategy,we obtained and analyzed the candidate resistant and susceptible lines by population selection.Gametophytes of the candidate lines were cultured in seawater containing Pyt.porphyrae zoospores.Antioxidase activities,including superoxide dismutase(SOD),peroxidase(POD)and polyphenol oxidase(PPO),were measured and compared between the two lines before and after infection.In the resistant lines,SOD and POD activities increased and then decreased,but PPO activity rose with the prolongation of the infection time.The phenylalanine ammonia lyase(PAL)activities also increased and then decreased after infection,but it had significantly different expression in the two lines without pathogen attack.The synthesis rates ofβ-1,3-glucanase,and cell-wall degrading enzyme were different from each other between the two lines after infection of P yt.porphyrae.Comparison in the contents of malondialdehyde(MDA)and reactive oxygen species(ROS)in the two lines showed that,the two contents varied synchronously in response to the pathogen attack.Changes of these enzymes activities or contents demonstrated that Pyr.yezoensis could resist against the pathogen of P yt.porphyrae with the antioxidant defense capacity.In addition,β-1.3-glucanase content showed extremely significant dif ference between the two lines,and the PAL had consistent expression dif ference.Therefore,phenylalanine ammonia lyase(PAL)andβ-1,3-glucanase can be considered as an ef fective index to distinguish susceptible line and resistant line,with which the workload of the resistant breeding could be reduced in the future. 关键词：population selection resistant lines susceptible lines P yropia yezoensis Pythium porphyrae

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Defensive physiological characters of Pyropia yezoensis resistant lines to the red rot disease

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