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Antagonism between coral pathogen Vibrio coralliilyticus and other bacteria in the gastric cavity of scleractinian coral galaxea fascicularis

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Science China Earth Sciences 2020年第1期63卷 157-166页

作者： Kaihao TANG Waner ZHAN Yiqing ZHOU Tao XU Xiaoqing CHEN Weiquan WANG Zhenshun ZENG Yan WANG Xiaoxue WANG Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Key Laboratory of Marine Materia MedicaRNAM Center for Marine MicrobiologySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China Ocean College Hainan UniversityHaikou 570228China

Scleractinian corals host numerous microbial symbionts with different types of interactions. The gastric cavity of scleractinian coral, as a semiclosed subenvironment with distinct chemical characteristics(e.g., dissolved O2, pH, alkalinity, and nutrients), harbors a distinct microbial community and a diverse array of bacteria that can be pathogenic or beneficial. galaxea fascicularis is one of the dominant massive scleractinian coral species on inshore fringing reefs in the northern South China *** the abundance of coral-associated bacteria has been investigated in G. fascicularis, less is known about the microorganisms in the gastric cavity. In this study, we specially isolated cultivable bacterial strains from the gastric cavity of *** collected from Hainan Island using a noninvasive sampling approach. Among the 101 representative bacterial strains, one Vibrio coralliilyticus strain, SCSIO 43001, was found to be a temperature-dependent opportunistic pathogen of ***. The antagonistic activity between the 100 strains and V. coralliilyticus SCSIO 43001 was tested using a modified Burkholder diffusion assay. Our results showed that V. coralliilyticus SCSIO 43001 inhibits the growth of Erythrobacter flavus and Sphingomonas yabuuchiae. Additionally, we found that three Pseudoalteromonas strains showed moderate to high antibacterial activity against V. coralliilyticus SCSIO 43001 and several other coral-associated Gram-negative bacterial *** results suggest that competition between the coral pathogen and other bacteria also occurs in the gastric cavity of coral, and Pseudoalteromonas strains in the gastric cavity of G. fascicularis may provide a protective role in the defense against coinhabiting coral pathogens at elevated temperature.

关键词： Coral pathogen galaxea fascicularis Scleractinian coral Vibrio coralliilyticus

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Linking coral fluorescence phenotypes to thermal bleaching in the reef-building galaxea fascicularis from the northern South China Sea

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Marine Life Science & Technology 2024年第1期6卷 155-167页

作者： Sanqiang Gong Jiayuan Liang Gang Li Lijia Xu Yehui Tan Xinqing Zheng Xuejie Jin Kefu Yu Xiaomin Xia Key Laboratory of Tropical Marine Bio-Resources and Ecology&Guangdong Provincial Key Laboratory of Applied Marine Biology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 510301China Coral Reef Research Center of China Guangxi UniversityNanning 53004China South China Institute of Environmental Sciences The Ministry of Ecology and Environment of PRCGuangzhou 510530China Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China

Coral fluorescence phenotypes have been suggested as an adaptation to a broad range of environmental conditions,yet the mechanisms linking thermal bleaching tolerance in reef-building coral populations,associated with fluorescence phenotypes due to GFP-like proteins,remains *** this study,the relationship between the thermal sensitivity and phenotypic plasticity of corals was investigated using two phenotypes of galaxea fascicularis,green and *** results reveal that brown *** was more susceptible to bleaching than green *** when exposed to a higher growth temperature of 32℃.Both phenotypes of *** were associated with the thermotolerant Symbiodiniaceae symbiont,Durusdinium ***,the brown *** showed a significant decrease in Symbiodiniaceae cell density and a significant increase in pathogenic bacteria abundance when the growth temperature was raised from 29 to 32℃.The physiological traits and transcriptomic profiles of Symbiodiniaceae were not notably affected,but there were differences in the transcriptional levels of certain genes between the two phenotype hosts of *** heat stress of 32℃,the gene encoding green fluorescent protein(GFP)-like and chromosome-associated proteins,as well as genes related to oxidative phosphorylation,cell growth and death showed lower transcriptional levels in the brown *** compared to the green ***,the results demonstrate that the green form of *** is better able to tolerate ocean warming and defend against pathogenic bacteria,likely due to higher gene transcription levels and defense ability.

关键词： Fluorescence phenotype Thermal bleaching Microbiome galaxea fascicularis Ocean warming

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Identification of bacteria-derived urease in the coral gastric cavity

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Science China Earth Sciences 2020年第10期63卷 1553-1563页

作者： Yiqing ZHOU Kaihao TANG Pengxia WANG Weiquan WANG Yan WANG Xiaoxue WANG Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Key Laboratory of Marine Materia MedicaRNAM Center for Marine MicrobiologyInnovation Academy of South China Sea Ecology and Environmental EngineeringSouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Marine Resource Utilization in South China Sea College of Marine SciencesHainan UniversityHaikou 570228China

Nitrogen cycle is critical to maintain a healthy coral reef *** can provide a source of nitrogen for coral holobiont and is important for coral calcification through degradation by *** the involvement of coral-associated bacteria in nitrogen fixation,nitrification and denitrification are well recognized,to what extend urea degradation by bacteria contributing to the urea utilization by coral holobiont remains to be *** this study,we demonstrate that the urea utilization is a common feature of Halomonas *** is a dominant genus in cultivable coral-associated bacteria.A urease operon was characterized by genome sequencing and gene knock-out technique in Halomonas meridiana SCSIO 43005,isolated from the gastric cavity of healthy scleractinian coral galaxea *** showed high urease activity which was induced by urea and deletion of the urease operon reduced the capability to use urea as solo nitrogen ***,approximately 1/3 coral-associated bacteria in the IMG/M database possess complete urease operons indicating the involvement of bacteria-derived ureases in coral *** results suggest that urease from coral-associated bacteria might be important player in the nitrogen cycling of coral reefs.

关键词： Urease Nitrogen cycling galaxea fascicularis Scleractinian coral Halomonas

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An ocean acidification-simulated system and its application in coral physiological studies

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Acta Oceanologica Sinica 2018年第12期37卷 55-62页

作者： ZHENG Xinqing WANG Chenying HADI Tri Aryono YE Youyin PAN Ke Third Institute of Oceanography Ministry of Natural Resources Research Center for Oceanography Indonesian Institute of Sciences Institute for Advanced Study Shenzhen University

Due to the elevated atmospheric carbon dioxide, ocean acidification(OA) has recently emerged as a research theme in marine biology due to an expected deleterious effect of altered seawater chemistry on calcification. A system simulating future OA scenario is crucial for OA-related studies. Here, we designed an OA-simulated system(OASys) with three solenoid-controlled CO_2 gas channels. The OASys can adjust the pH of the seawater by bubbling CO_2 gas into seawaters via feedback systems. The OASys is very simple in structure with an integrated design and is new-user friendly with the instruction. Moreover, the OASys can monitor and record real-time pH values and can maintain pH levels within 0.02 pH unit. In a 15-d experiment, the OASys was applied to simulate OA in which the expected target pH values were 8.00, 7.80 and 7.60 to study the calcifying response of galaxea fascicularis. The results showed daily mean seawater pH values held at pH 8.00±0.01, 7.80±0.01 and 7.61±0.01 over15 d. Correspondingly, the coral calcification of G. fascicularis gradually decreased with reduced pH.

关键词： ocean acidification OASys coral galaxea fascicularis

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