アフィリエイトビー

入学希望の方一般・社会人の方研究者の方同窓生の方在学生の方教職員の方 日本語 (Japanese) Graduate School of Life Sciences, Tohoku University Access sitemap Link Tohoku University HOMEAbout UsAbout UsMessage from the DeanOrganizationMovieResearchLaboratories Department of Integrative Life Sciences Department of Ecological Developmental Adaptability Life Sciences Department of Molecular and Chemical Life SciencesResearchAwardEducationDegree ProgramsCourseSyllabusScheduleStudent LifeAdmissionAdmission InformationApplicationExamination Schedule and Application GuidelinesInformation Session(2024)Admission and Tuition FeesAdmission PolicyVoices from Graduates and Current StudentsAdmissions Q&AInquiries about Entrance ExaminationsFinancial SupportFor StudentsGraduate School&＃039;s Message Board for Students Information about Completion and Advancement to the Doctoral Course ProceduresCertificatesAbout Issuance of Various CertificatesNotice Regarding the Suspension of Operation of the Automatic Certificate Issuing MachinesLeave of absence/withdrawal from universityCampus Life, Various consultation servicesContactAccessLinkSitemapInformationAdmissionResearchAwardSeminarJobNewsAnnouncementOther MENU HOMEAbout UsAbout UsMessage from the DeanOrganizationMovieResearchLaboratoriesResearchAwardEducationDegree ProgramsCourseSyllabusScheduleStudent LifeAdmissionAdmission InformationApplicationExamination Schedule and Application GuidelinesInformation Session(2024)Admission and Tuition FeesAdmission PolicyVoices from Graduates and Current StudentsAdmissions Q&AInquiries about Entrance ExaminationsFinancial SupportFor StudentsGraduate School&＃039;s Message Board for Students Information about Completion and Advancement to the Doctoral Course ProceduresCertificatesLeave of absence/withdrawal from universityCampus Life, Various consultation servicesContactAccessLinkSitemapInformationAdmissionResearchAwardSeminarJobNewsAnnouncementOther 日本語 (Japanese) CLOSE Graduate School of Life Sciences, Tohoku University. Information Information Researchers Unearth a New Process By Which Algae Pass on Nurtirients to their Coral Host HOME Information Researchers Unearth a New Process By Which Algae Pass on Nurtirients to their Coral Host JAPANESE Researchers Unearth a New Process By Which Algae Pass on Nurtirients to their Coral Host 2023.08.23 11:00 Researchers have identified a new pathway by which sugar is released by symbiotic algae. This pathway involves the largely overlooked cell wall, showing that this structure not only protects the cell but plays an important role in symbiosis and carbon circulation in the ocean.   The findings were reported in the journal eLife on August 18, 2023.   It is widely known that microalgae enjoy a symbiotic relationship with cnidarians such as corals and sea anemones. The algae use the sun light to produce sugars and other carbohydrates and pass them on to the coral. In return, the coral provides nutrients and shelter to the algae. This fertile coral reefs form in the nutrient-poor tropical oceans and partially addresses the Darwin paradox.     Yet this symbiotic relationship is both delicate and complex; the slightest change in temperature, pollution or water chemistry can have adverse impacts, leading to coral bleaching or other negative effects on the ecosystem. Scientist still do not understand many of the intricate processes at play when it comes to this relationship, but doing so is crucial for the preservation of coral reefs and the biodiversity they support.     “We discovered that the release of sugar occurs when the algal cell begins degrading its own cell wall,” explains Shinichiro Maruyama, lead-author of the research and an associate professor at the University of Tokyo’s Graduate School of Frontier Sciences. “This breakdown of the cell wall happens even when a symbiotic host is absent and gets enhanced when conditions become more acidic.”     Symbiotic algae live in special compartments within coral cells - symbiosomes - or the guts of marine animals. These environments are generally acidic, and the researchers interpret the sugar release as the algal response to environmental changes in nature.     The researchers also found the sugar release is mediated by the enzyme cellulase, which is known for its usage in breaking down the cell walls in land plants. When the alga gets treated with a cellulase inhibitor, the amount of sugar released outside of the cell decreases, indicating that the degradation of sugar chains by cellulase is directly related to the increase in sugar release in acidic conditions.     “Our findings suggest that the algal-coral interaction is more complex than ever thought, providing an important piece of the jigsaw puzzle when it comes to carbon cycling in marine environments,” adds Maruyama.     For their next steps, Maruyama and his team will begin clarifying the molecular mechanisms of sugar release, cell wall maintenance, and regulation of enzymatic reactions. Already, they have embarked on a project to disclose the whole diversity of molecules secreted from symbiotic algae, which will further provide insights into what kind of ‘molecular language’ is exchanged between symbionts and hosts.   Coral reef ecosystem supported by symbiosis with microalgae    A model of the pathways of sugar secretion from coral symbiotic algae     Pocillopora coral in symbiosis with microalgae     Publication Details Title:Environmental pH signals the release of monosaccharides from cell wall in coral symbiotic alga Authors: Yuu Ishii, Hironori Ishii, Takeshi Kuroha, Ryusuke Yokoyama, Ryusaku Deguchi, Kazuhiko Nishitani, Jun Minagawa, Masakado Kawata, Shunichi Takahashi, Shinichiro Maruyama* Journal: eLife DOI: https://doi.org/10.7554/eLife.80628   Link Tohoku University Graduate School of Science and Faculty of Science Tohoku University Graduate School of frontier sciences, the University of Tokyo     Contact Name: Shinichiro Maruyama Affiliation: Laboratory of Integrated Biology Department of Integrated Biosciences Graduate School of Frontier Sciences The University of Tokyo Email: [email protected] Website: https://www.ib.k.u-tokyo.ac.jp/english/faculty/integrated_biology/       Prev INDEX Next InformationAdmissionResearchAwardSeminarJobNewsAnnouncementOther GO TOP Graduate School of Life SciencesTohoku University 2-1-1 Katahira, Aoba-Ku, Sendai 980-8577 Academic Affairs Section Tel : +81-22-217-5706 / Fax: +81-22-217-5704   General Affairs Section Tel : +81-22-217-5702 / Fax: +81-22-217-5704   Contact ・Privacy Policy HOMEAbout UsAbout UsMessage from the DeanOrganizationMovieResearchLaboratories Department of Integrative Life Sciences Department of Ecological Developmental Adaptability Life Sciences Department of Molecular and Chemical Life SciencesResearchAwardEducationDegree ProgramsCourseSyllabusScheduleStudent LifeAdmissionAdmission InformationApplicationExamination Schedule and Application GuidelinesInformation Session(2024)Admission and Tuition FeesAdmission PolicyVoices from Graduates and Current StudentsAdmissions Q&AInquiries about Entrance ExaminationsFinancial SupportFor StudentsGraduate School&＃039;s Message Board for Students Information about Completion and Advancement to the Doctoral Course ProceduresCertificatesAbout Issuance of Various CertificatesNotice Regarding the Suspension of Operation of the Automatic Certificate Issuing MachinesLeave of absence/withdrawal from universityCampus Life, Various consultation servicesContactAccessLinkSitemapInformationAdmissionResearchAwardSeminarJobNewsAnnouncementOther © 2004-2023 Graduate School of Life Sciences, Tohoku University no cache