Liberibacter
            crescens gen. nov., sp. nov., the first cultured member of the genus Liberibacter

Fagen, Jennie R.; Leonard, Michael T.; Coyle, Janelle F.; McCullough, Connor; Davis-Richardson, Austin G.; Davis, Michael J.; Triplett, Eric W.

doi:10.1099/ijs.0.063255-0

Cited by 83 publications

(88 citation statements)

References 29 publications

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“…Liberibacter solanacearum' ZC1, the causal agent of tomato psyllid yellows and potato zebra chip, and found a total of 207 genes of known functions and 238 hypothetical genes of unknown function unique to Lcr, some of which could contribute to its ability to grow in vitro. The CaL species lost the ability to synthesize proline, phenylalanine, tryptophan, cysteine, tyrosine and histidine as well as components of several systems that could compromise their ability to sense and adjust to environmental fluctuations, such as two-component regulatory systems, the stringent response, and an alternate cytochrome pathway [59]. In addition, Lai et al [62] using genome-wide transposon mutagenesis identified 314 protein-coding genes required for Lcr BT-1 growth in BM7 medium.…”

Section: 'Candidatus Liberibacter'mentioning

confidence: 99%

“…Recently, the bacterial isolate BT-1 was recovered in pure culture from the phloem sap of defoliating mountain papaya (Carica stipulata × C. pubescens) in Puerto Rico and shown to be closely related to CaLam and CaLas based on similarity of 16S rDNA and conserved protein sequences as well as on genome-wide ANI analysis [58,59]. The isolation and genome sequencing of this isolate, classified as Liberibacter crescens (Lcr), allowed for the first time a comprehensive description of the morphological, biochemical, and physiological characteristics of the genus Liberibacter [59].…”

Section: 'Candidatus Liberibacter'mentioning

confidence: 99%

“…[54][55][56][57][58][59], Lcr has become an important model to investigate biological aspects that could be relevant to grow in vitro and to control CaL species. Fagen et al [57] used RAST [60], KEGG [61] and manual annotation to compare the genome sequence of Lcr BT-1 with those of CaLas psy62 and 'Ca.…”

Section: 'Candidatus Liberibacter'mentioning

confidence: 99%

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Bacterial Citrus Diseases: Major Threats and Recent Progress

Jl¹

2017

JBMOA

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Citriculture is an important, highly organized, and competitive sector of the Brazilian economy. Nonetheless, citrus production is constantly threatened by pathogens that cause considerable economic losses and severe social impacts. Among the major citrus diseases are citrus canker (CCK), citrus variegated chlorosis (CVC), and Huanglongbing (HLB), caused by members of the bacterial species Xanthomonas citri (Xcc), Xylella fastidiosa (Xfa), and 'Candidatus Liberibacter' (CaL), respectively. During the last years, management practices for CVC and HLB in Brazil have provided good results, maintaining the disease incidence at low levels. In contrast, CCK re-emerged as the main citrus disease because of the inefficacy of the current eradication program. In this review, we discuss about the biology of the plant-pathogen interactions, several controversial aspects on the taxonomy of the causal agents, the molecular mechanisms they use to cause disease in citrus plants, the strategies used for disease management and their limitations, and some emerging control alternatives that may be available for commercial production in the future, including transgenic and genome-edited plants with enhanced resistance.

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Section: 'Candidatus Liberibacter'mentioning

confidence: 99%

Section: 'Candidatus Liberibacter'mentioning

confidence: 99%

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Bacterial Citrus Diseases: Major Threats and Recent Progress

Jl¹

2017

JBMOA

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“…The malformed names 'Candidatus Liberobacter asiaticum' and 'Candidatus Liberobacter africanum' [5] were later corrected to 'Candidatus Liberibacter asiaticus' and 'Candidatus Liberibacter africanus' [6]. After a member of the group was brought into pure culture, the genus name Liberibacter was validly published [7].…”

mentioning

confidence: 99%

A plea for linguistic accuracy – also for Candidatus taxa

Oren

2017

International Journal of Systematic and Evolutionary Microbiology

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While all names of new taxa submitted to the International Journal of Systematic and Evolutionary Microbiology, either in direct submissions or in validation requests for names effectively published elsewhere, are subject to nomenclatural review to ensure that they are acceptable based on the rules of the International Code of Nomenclature of Prokaryotes, the names of Candidatus taxa have not been subjected to such a review. Formally, this was not necessary because the rank of Candidatus is not covered by the Code, and the names lack the priority afforded validly published names. However, many Candidatus taxa of different ranks are widely discussed in the scientific literature, and a proposal to incorporate the nomenclature of uncultured prokaryotes under the provisions of the Code is currently pending. Therefore, an evaluation of the names of Candidatus taxa published thus far is very timely. Out of the~400 Candidatus names found in the literature, 120 contradict the current rules of the Code or are otherwise problematic. A list of those names of Candidatus taxa that need correction is presented here and alternative names that agree with the provisions of the Code are proposed.

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“…Liberibacter crescens (Lcr), as the only cultured species within the liberibacters, is the first representative of the new genus Liberibacter to be validly published and named [35]. This species has been isolated from expressed sap of a defoliating mountain papaya in Puerto Rico [35].…”

Section: Introductionmentioning

confidence: 99%

Intragenomic homogeneity on Liberibacter 16S rDNA confirms phylogeny and explains ecological strategy

Nelson

Wulff

Bové³

2015

Preprint

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Three of the five currently recognized "Candidatus Liberibacter" spp., "Ca. L. asiaticus" (Las), "Ca. L. americanus" (Lam) and "Ca. L. solanacearum", and the newly erected genus Liberibacter species, L. crescens (Lcr), have had their genomes sequenced. In all four cases there are three homogeneous copies of the 16S rRNA gene, one present as the reverse complement of the other two. 16S intragenic homogeneity is common within the α-Proteobacteria. The presence of three 16S rRNA copies indicates an advantage for a rapid response of population increase to favourable growth conditions. The metabolic cost of carrying multiple copies is avoided during periods of low cellular activity as this situation occurs at low temperatures, for example overwintering in deciduous plants or in a dormant insect host. A large insertion in the 16S rDNA sequence of three species compared to the other three species indicates a dichotomy in the Liberibacter genus and provides a phylogenetic signal of closeness to the proximal node within the Rhizobiaceae. In spite of similar symptoms in Citrus crops associated with Lam and Las infections, these species belong on either side of this dichotomy, thus confirming Lam as phylogenetically closer to the proximal node than Las.

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Liberibacter crescens gen. nov., sp. nov., the first cultured member of the genus Liberibacter

Cited by 83 publications

References 29 publications

Bacterial Citrus Diseases: Major Threats and Recent Progress

Bacterial Citrus Diseases: Major Threats and Recent Progress

A plea for linguistic accuracy – also for Candidatus taxa

Intragenomic homogeneity on Liberibacter 16S rDNA confirms phylogeny and explains ecological strategy

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