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Sunday, July 7, 2019

Genomes of ‘Candidatus Liberibacter solanacearum’ Haplotype A from New Zealand and the United States Suggest Significant Genome Plasticity in the Species.

‘Candidatus Liberibacter solanacearum’ contains two solanaceous crop-infecting haplotypes, A and B. Two haplotype A draft genomes were assembled and compared with ZC1 (haplotype B), revealing inversion and relocation genomic rearrangements, numerous single-nucleotide polymorphisms, and differences in phage-related regions. Differences in prophage location and sequence were seen both within and between haplotype comparisons. OrthoMCL and BLAST analyses identified 46 putative coding sequences present in haplotype A that were not present in haplotype B. Thirty-eight of these loci were not found in sequences from other Liberibacter spp. Quantitative polymerase chain reaction (qPCR) assays designed to amplify sequences from 15 of these loci…

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Sunday, July 7, 2019

The genome of the Saprophytic fungus Verticillium tricorpus reveals a complex effector repertoire resembling that of its pathogenic relatives.

Vascular wilts caused by Verticillium spp. are destructive plant diseases affecting hundreds of hosts. Only a few Verticillium spp. are causal agents of vascular wilt diseases, of which V. dahliae is the most notorious pathogen, and several V. dahliae genomes are available. In contrast, V. tricorpus is mainly known as a saprophyte and causal agent of opportunistic infections. Based on a hybrid approach that combines second and third generation sequencing, a near-gapless V. tricorpus genome assembly was obtained. With comparative genomics, we sought to identify genomic features in V. dahliae that confer the ability to cause vascular wilt disease. Unexpectedly,…

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Sunday, July 7, 2019

Complete genome sequence of Bacillus subtilis J-5, a potential biocontrol agent.

Bacillus subtilis J-5 was isolated from tomato rhizosphere soil and exhibited strong inhibitory activity against Botrytis cinerea To shed light on the molecular mechanism underlying the biological control on phytopathogens, the whole genome of this strain was sequenced. Genes encoding antimicrobial compounds and the regulatory systems were identified in the genome. Copyright © 2017 Jia et al.

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Sunday, July 7, 2019

Generation of a collection of mutant tomato lines using pooled CRISPR libraries.

The high efficiency of clustered regularly interspaced short palindromic repeats (CRISPR)-mediated mutagenesis in plants enables the development of high-throughput mutagenesis strategies. By transforming pooled CRISPR libraries into tomato (Solanum lycopersicum), collections of mutant lines were generated with minimal transformation attempts and in a relatively short period of time. Identification of the targeted gene(s) was easily determined by sequencing the incorporated guide RNA(s) in the primary transgenic events. From a single transformation with a CRISPR library targeting the immunity-associated leucine-rich repeat subfamily XII genes, heritable mutations were recovered in 15 of the 54 genes targeted. To increase throughput, a second CRISPR…

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Sunday, July 7, 2019

Genomic analysis of Clavibacter michiganensis reveals insight into virulence strategies and genetic diversity of a gram-positive bacterial pathogen.

Clavibacter michiganensis subsp. michiganensis is a gram-positive bacterial pathogen that proliferates in the xylem vessels of tomato, causing bacterial canker disease. In this study, we sequenced and assembled genomes of 11 C. michiganensis subsp. michiganensis strains isolated from infected tomato fields in California as well as five Clavibacter strains that colonize tomato endophytically but are not pathogenic in this host. The analysis of the C. michiganensis subsp. michiganensis genomes supported the monophyletic nature of this pathogen but revealed genetic diversity among strains, consistent with multiple introduction events. Two tomato endophytes that clustered phylogenetically with C. michiganensis strains capable of infecting…

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Sunday, July 7, 2019

Draft genome of Paraburkholderia caballeronis TNe-841T, a free-living, nitrogen-fixing, tomato plant-associated bacterium.

10.1601/nm.26956 caballeronis is a plant-associated bacterium. Strain TNe-841T was isolated from the rhizosphere of tomato (Solanum lycopersicum L. var. lycopersicum) growing in Nepantla Mexico State. Initially this bacterium was found to effectively nodulate Phaseolus vulgaris L. However, from an analysis of the genome of strain TNe-841T and from repeat inoculation experiments, we found that this strain did not nodulate bean and also lacked nodulation genes, suggesting that the genes were lost. The genome consists of 7,115,141 bp with a G?+?C content of 67.01%. The sequence includes 6251 protein-coding genes and 87 RNA genes.

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Sunday, July 7, 2019

In planta comparative transcriptomics of host-adapted strains of Ralstonia solanacearum.

Background. Ralstonia solanacearum is an economically important plant pathogen with an unusually large host range. The Moko (banana) and NPB (not pathogenic to banana) strain groups are closely related but are adapted to distinct hosts. Previous comparative genomics studies uncovered very few differences that could account for the host range difference between these pathotypes. To better understand the basis of this host specificity, we used RNAseq to profile the transcriptomes of an R. solanacearum Moko strain and an NPB strain under in vitro and in planta conditions. Results. RNAs were sequenced from bacteria grown in rich and minimal media, and from…

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Sunday, July 7, 2019

Complete genome sequence of Pseudomonas syringae pv. lapsa strain ATCC 10859, isolated from infected wheat.

Pseudomonas syringae pv. lapsa is a pathovar of Pseudomonas syringae that can infect wheat. The complete genome of P. syringae pv. lapsa strain ATCC 10859 contains a 5,918,899-bp circular chromosome with 4,973 coding sequences, 16 rRNAs, 69 tRNAs, and an average GC content of 59.13%. The analysis of this genome revealed several gene clusters that are related to pathogenesis and virulence. Copyright © 2016 Kong et al.

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