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364


Minisyncoccus archaeiphilus gen. nov., sp. nov., a mesophilic, obligate parasitic bacterium and proposal of Minisyncoccaceae fam. nov., Minisyncoccales ord. nov., Minisyncoccia class. nov. and Minisyncoccota phyl. nov. formerly referred to as Candidatus Patescibacteria or candidate phyla radiation

Citation
Nakajima et al. (2025). International Journal of Systematic and Evolutionary Microbiology 75 (2)
Names
Minisyncoccota Minisyncoccia Minisyncoccales Minisyncoccaceae Minisyncoccus Minisyncoccus archaeiphilus T Patescibacteriota
Abstract
In the domain Bacteria, one of the largest, most diverse and environmentally ubiquitous phylogenetic groups, Candidatus Patescibacteria (also known as candidate phyla radiation/CPR), remains poorly characterized, leaving a major knowledge gap in microbial ecology. We recently discovered a novel cross-domain symbiosis between Ca. Patescibacteria and Archaea in highly purified enrichment cultures and proposed Candidatus taxa for the characterized species, including Ca. Minisyncoccus archaeophilus

Comparison of qPCR protocols for quantification of “Candidatus Saccharibacteria”, belonging to the Candidate Phyla Radiation, suggests that 23S rRNA is a better target than 16S rRNA

Citation
Papaleo et al. (2024). PLOS ONE 19 (12)
Names
Ca. Saccharibacteria
Abstract
Background Candidate Phyla Radiation (CPR) is a large monophyletic group encompassing about 25% of bacterial diversity. Among CPR, “Candidatus Saccharibacteria” is one of the most clinically relevant phyla. Indeed, it is enriched in the oral microbiota of subjects suffering from immune-mediated disorders and it has been found to have immunomodulatory activities. For these reasons, it is crucial to have reliable methods to detect and quantify this bacterial lineage in human samples, including sa

Grove-Level Analysis of the Titer and Prevalence of ‘Candidatus Liberibacter asiaticus’ and Wolbachia in Diaphorina citri, Vector of Citrus Huanglongbing

Citation
Mann et al. (2024). Phytobiomes Journal 8 (4)
Names
Ca. Liberibacter asiaticus
Abstract
Huanglongbing (HLB, or citrus greening disease) affects all citrus varieties worldwide. In the United States, Asia, and South America, the causal agent is ‘ Candidatus Liberibacter asiaticus’ ( CLas), a phloem-limited, uncultured alphaproteobacterium. The hemipteran insect vector Diaphorina citri (Asian citrus psyllid) acquires and transmits CLas in a circulative, propagative manner. In addition to CLas, D. citri hosts multiple symbiotic bacterial species including Wolbachia (wDi). In D. citri,

Fidelibacter multiformis gen. nov., sp. nov., isolated from a deep subsurface aquifer and proposal of Fidelibacterota phyl. nov., formerly called Marine Group A, SAR406 or Candidatus Marinimicrobia

Citation
Katayama et al. (2024). International Journal of Systematic and Evolutionary Microbiology 74 (10)
Names
Fidelibacterota Fidelibacteria Fidelibacterales Fidelibacteraceae “Neomarinimicrobiota”
Abstract
A Gram-negative, obligatory anaerobic, chemoheterotrophic bacterium, designated strain IA91T, was isolated from sediments and formation water from deep aquifers in Japan. IA91T derives its peptidoglycan, energy and carbon from exogenous cell wall fragments, namely muropeptides, released from actively reproducing bacteria, and is dependent on other bacteria for cell wall formation, growth and even cell shape: IA91T is irregular rod-shaped but coccoids when muropeptide is absent. IA91T grew in a t

SDE19, a SEC-dependent effector from ‘Candidatus Liberibacter asiaticus’ suppresses plant immunity and targets Citrus sinensis Sec12 to interfere with vesicle trafficking

Citation
Huang et al. (2024). PLOS Pathogens 20 (9)
Names
Ca. Liberibacter asiaticus
Abstract
Citrus huanglongbing (HLB), which is caused by the phloem-colonizing bacteria Candidatus Liberibacter asiaticus (CLas), poses a significant threat to citrus production worldwide. The pathogenicity mechanism of HLB remains poorly understood. SEC-dependent effectors (SDEs) have been suggested to play critical roles in the interaction between citrus and CLas. Here, we explored the function of CLIBASIA_05320 (SDE19), a core SDE from CLas, and its interaction with its host target. Our data revealed t

Mycovorax composti gen. nov., sp. nov., a member of the family Chitinophagaceae isolated from button mushroom compost

Citation
Thai et al. (2024). International Journal of Systematic and Evolutionary Microbiology 74 (8)
Names
Mycovorax composti T
Abstract
Two Gram-stain-negative, aerobic, rod-shaped, orange-coloured bacterial strains, designated strain C216T and strain M2295, were isolated from mature mushroom compost from composting facilities in Victoria and South Australia, Australia, respectively. External structures such as flagella or pili were not observed on the cells under scanning electron microscopy. Optimal growth was found to occur at 45 °C, at pH 7.25 and in the absence of NaCl on Emerson’s 350 YpSs medium. The genome sequence of st

'Candidatus Phytoplasma vignae’, assigning a species description to a long-known phytoplasma occurring in northern Australia

Citation
Rodrigues Jardim et al. (2024). International Journal of Systematic and Evolutionary Microbiology 74 (8)
Names
Ca. Phytoplasma vignae Ca. Phytoplasma phoenicium Ca. Phytoplasma omanense Ca. Phytoplasma
Abstract
Gene- and genome-based approaches were used to determine whether Vigna little leaf (ViLL) phytoplasma, which occurs in northern Australia, is a distinct ‘Candidatus Phytoplasma’ species. The ViLL 16S rRNA gene sequences exhibited the highest known similarity to species in the 16SrXXIX-A and 16SrIX-D subgroups, namely ‘Candidatus Phytoplasma omanense’ (98.03–98.10%) and ‘Candidatus Phytoplasma phoenicium’ (96.87–97.20%), respectively. A total of 48 single-copy orthologue genes were identified to

Bocconia frutescens little leaf, a new plant disease associated to a ´Candidatus Phytoplasma pruni´ related strain in Costa Rica

Citation
Villalobos-Muller et al. (2024). Revista Mexicana de Fitopatología, Mexican Journal of Phytopathology 42 (3)
Names
Ca. Phytoplasma pruni
Abstract
Objective/Background. Bocconia frutescens (Papaveraceae) is a small tree distributed naturally from Mexico to Argentina and the Caribbean Bassin. Bocconia trees showing symptoms resembling phytoplasmas infection, such as little leaves and witches´-broom, were found in Cartago province, Costa Rica. Detection and identification of the potential phytoplasmas associated with B. frutescens little leaf symptoms was the objective out of this study. Materials and Methods. Evaluation of leaves tissue usi

Promethearchaeum syntrophicum gen. nov., sp. nov., an anaerobic, obligately syntrophic archaeon, the first isolate of the lineage ‘Asgard’ archaea, and proposal of the new archaeal phylum Promethearchaeota phyl. nov. and kingdom Promethearchaeati regn. nov

Citation
Imachi et al. (2024). International Journal of Systematic and Evolutionary Microbiology 74 (7)
Names
Promethearchaeum syntrophicum T Promethearchaeota Promethearchaeia Promethearchaeales Promethearchaeaceae Promethearchaeum
Abstract
An anaerobic, mesophilic, syntrophic, archaeon strain MK-D1T, was isolated as a pure co-culture with Methanogenium sp. strain MK-MG from deep-sea methane seep sediment. This organism is, to our knowledge, the first cultured representative of ‘Asgard’ archaea, an archaeal group closely related to eukaryotes. Here, we describe the detailed physiology and phylogeny of MK-D1T and propose Promethearchaeum syntrophicum gen. nov., sp. nov. to accommodate this strain. Cells were non-motile, small cocci,