DOI: 10.1111/gcb.14907
论文题名: Molecular mechanisms of acclimation to long-term elevated temperature exposure in marine symbioses
作者: Alves Monteiro H.J. ; Brahmi C. ; Mayfield A.B. ; Vidal-Dupiol J. ; Lapeyre B. ; Le Luyer J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2020
卷: 26, 期: 3 语种: 英语
英文关键词: co-expression network analysis
; giant clams
; metabarcoding
; RNA-Seq
; Symbiodiniaceae
; thermo-acclimation
Scopus关键词: acclimation
; bivalve
; molecular ecology
; network analysis
; physiological response
; RNA
; seawater
; symbiosis
; temperature effect
; water temperature
; French Polynesia
; Anthozoa
; Bivalvia
; Dinophyceae
; Pocillopora damicornis
; Symbiodiniaceae
英文摘要: Seawater temperature rise in French Polynesia has repeatedly resulted in the bleaching of corals and giant clams. Because giant clams possess distinctive ectosymbiotic features, they represent a unique and powerful model for comparing molecular pathways involved in (a) maintenance of symbiosis and (b) acquisition of thermotolerance among coral reef organisms. Herein, we explored the physiological and transcriptomic responses of the clam hosts and their photosynthetically active symbionts over a 65 day experiment in which clams were exposed to either normal or environmentally relevant elevated seawater temperatures. Additionally, we used metabarcoding data coupled with in situ sampling/survey data to explore the relative importance of holobiont adaptation (i.e., a symbiont community shift) versus acclimation (i.e., physiological changes at the molecular level) in the clams’ responses to environmental change. We finally compared transcriptomic data to publicly available genomic datasets for Symbiodiniaceae dinoflagellates (both cultured and in hospite with the coral Pocillopora damicornis) to better tease apart the responses of both hosts and specific symbiont genotypes in this mutualistic association. Gene module preservation analysis revealed that the function of the symbionts’ photosystem II was impaired at high temperature, and this response was also found across all holobionts and Symbiodiniaceae lineages examined. Similarly, epigenetic modulation appeared to be a key response mechanism for symbionts in hospite with giant clams exposed to high temperatures, and such modulation was able to distinguish thermotolerant from thermosensitive Cladocopium goreaui ecotypes; epigenetic processes may, then, represent a promising research avenue for those interested in coral reef conservation in this era of changing global climate. © 2019 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159116
Appears in Collections: 气候变化与战略
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作者单位: IFREMER, UMR Ecosystèmes Insulaires Océaniens, UPF, ILM, IRD, Tahiti, France; Université de la Polynésie Française, UMR Ecosystèmes Insulaires Océaniens, Ifremer, ILM, IRD, Tahiti, France; National Museum of Marine Biology and Aquarium, Checheng, Taiwan; Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, Miami, FL, United States; IHPE, Univ. Montpellier, CNRS, Univ. Perpignan Via Domitia, Montpellier, France; EPHE-CNRS-UPVD, USR3278-CRIOBE, Labex CORAIL, Moorea, France
Recommended Citation:
Alves Monteiro H.J.,Brahmi C.,Mayfield A.B.,et al. Molecular mechanisms of acclimation to long-term elevated temperature exposure in marine symbioses[J]. Global Change Biology,2020-01-01,26(3)