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首页> 外文期刊>The ISME journal emultidisciplinary journal of microbial ecology >Taxonomic and functional heterogeneity of the gill microbiome in a symbiotic coastal mangrove lucinid species
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Taxonomic and functional heterogeneity of the gill microbiome in a symbiotic coastal mangrove lucinid species

机译：共生沿海红树林唑酸盐物种中鳃微生物组的分类和功能异质性

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摘要

Lucinidae clams harbor gammaproteobacterial thioautotrophic gill endosymbionts that are environmentally acquired. Thioautotrophic lucinid symbionts are related to metabolically similar symbionts associated with diverse marine host taxa and fall into three distinct phylogenetic clades. Most studies on the lucinid-bacteria chemosymbiosis have been done with seagrass-dwelling hosts, whose symbionts belong to the largest phylogenetic clade. In this study, we examined the taxonomy and functional repertoire of bacterial endosymbionts at an unprecedented resolution from Phacoides pectinatus retrieved from mangrove-lined coastal sediments, which are underrepresented in chemosymbiosis studies. The P. pectinatus thioautotrophic endosymbiont expressed metabolic gene variants for thioautotrophy, respiration, and nitrogen assimilation distinct from previously characterized lucinid thioautotrophic symbionts and other marine symbionts. At least two other bacterial species with different metabolisms were also consistently identified in the P. pectinatus gill microbiome, including a Kistimonas-like species and a Spirochaeta-like species. Bacterial transcripts involved in adhesion, growth, and virulence and mixotrophy were highly expressed, as were host-related hemoglobin and lysozyme transcripts indicative of sulfide/oxygen/CO2 transport and bactericidal activity. This study suggests the potential roles of P. pectinatus and its gill microbiome species in mangrove sediment biogeochemistry and offers insights into host and microbe metabolisms in the habitat.
机译：满月蛤科蚬港对环境取得gammaproteobacterial thioautotrophic鳃共生。噻吩rocinic唑肽共生与与不同海洋宿主分类群相关的代谢类似的共生，并落入三个不同的系统发育型切片。大多数关于唑肽 - 细菌化学联胞外的研究已经用海草居住的宿主进行，其共生属于最大的系统发育人物。在这项研究中，我们在从红树林沿海沉积物中检索的Phacoides Pectinatus的前所未有的分辨率检查了细菌内联核的分类和功能性曲目。 P.Pectinatus硫代雌性嗜endosymbiont表达了从先前特征的唑类毒素植物共生和其他海洋Symbion中不同的硫代术，呼吸和氮同化的代谢基因变体。在P.Pectinatus鳃微生物组中也一致地鉴定出至少两种具有不同代谢的细菌物种，包括类似Kistimonas样物种和螺旋形物种。涉及粘附，生长和毒力和混纺术的细菌转录物高表达，与宿主相关的血红蛋白和溶菌酶转录物，其指示硫化物/氧/ CO2传输和杀菌活性。本研究表明，P.Pectinatus及其鳃微生物组种类在红树林沉积物生物地球化学中的潜在作用，并在栖息地中提供了宿主和微生物代谢的见解。

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