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Tuesday, April 21, 2020

Genome sequence resource for Ilyonectria mors-panacis, causing rusty root rot of Panax notoginseng.

Ilyonectria mors-panacis is a serious disease hampering the production of Panax notoginseng, an important Chinese medicinal herb, widely used for its anti-inflammatory, anti-fatigue, hepato-protective, and coronary heart disease prevention effects. Here, we report the first Illumina-Pacbio hybrid sequenced draft genome assembly of I. mors-panacis strain G3B and its annotation. The availability of this genome sequence not only represents an important tool toward understanding the genetics behind the infection mechanism of I. mors-panacis strain G3B but also will help illuminate the complexities of the taxonomy of this species.

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Tuesday, April 21, 2020

Genome data of Fusarium oxysporum f. sp. cubense race 1 and tropical race 4 isolates using long-read sequencing.

Fusarium wilt of banana is caused by the soil-borne fungal pathogen Fusarium oxysporum f. sp. cubense (Foc). We generated two chromosome-level assemblies of Foc race 1 and tropical race 4 strains using single-molecule real-time sequencing. The Foc1 and FocTR4 assemblies had 35 and 29 contigs with contig N50 lengths of 2.08 Mb and 4.28 Mb, respectively. These two new references genomes represent a greater than 100-fold improvement over the contig N50 statistics of the previous short read-based Foc assemblies. The two high-quality assemblies reported here will be a valuable resource for the comparative analysis of Foc races at the pathogenic…

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Tuesday, April 21, 2020

High-Quality Draft Genome Sequence of Fusarium oxysporum f. sp. cubense Strain 160527, a Causal Agent of Panama Disease.

Fusarium oxysporum f. sp. cubense is the causal agent of banana Fusarium wilt, also known as Panama disease. Here, we present a high-quality genome sequence of F. oxysporum f. sp. cubense strain 160527. The genome assembly is composed of 12 contigs with a total assembly length of 51,139,495?bp (N50 contig length, 4,884,632?bp). Copyright © 2019 Asai et al.

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Tuesday, April 21, 2020

Genome Sequence of a California Isolate of Fusarium oxysporum f. sp. lycopersici Race 3, a Fungus Causing Wilt Disease on Tomato.

Fusarium wilt of tomato, caused by the soilborne fungus Fusarium oxysporum f. sp. lycopersici, is an increasingly important disease of tomato. This paper reports the high-quality draft genome assembly of F. oxysporum f. sp. lycopersici isolate D11 (race 3), which consists of 39 scaffolds with 57,281,978?bp (GC content, 47.5%), an N50 of 4,408,267?bp, a mean read coverage of 99.8×, and 17,682 predicted genes. Copyright © 2019 Henry et al.

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Tuesday, April 21, 2020

The role of long-term mineral and organic fertilisation treatment in changing pathogen and symbiont community composition in soil

Application of organic fertilisers to soil prevents erosion, improves fertility and may suppress certain soil-borne plant pathogens, but it is still unclear how different trophic groups of fungi and oomycetes respond to long-term fertilisation treatment. The objective of the study was to examine the effect of different fertilisation regimes on fungal and oomycete pathogen- and mycorrhizal symbiont diversity and community structure in both soil and roots, using PacBio SMRT sequencing. The field experiment included three fertilisation treatments that have been applied since 1989: nitrogen fertilisation (WOM), nitrogen fertilisation with manure amendment (FYM) and alternative organic fertilisation (AOF), each applied at…

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Tuesday, April 21, 2020

Diversity of phytobeneficial traits revealed by whole-genome analysis of worldwide-isolated phenazine-producing Pseudomonas spp.

Plant-beneficial Pseudomonas spp. competitively colonize the rhizosphere and display plant-growth promotion and/or disease-suppression activities. Some strains within the P. fluorescens species complex produce phenazine derivatives, such as phenazine-1-carboxylic acid. These antimicrobial compounds are broadly inhibitory to numerous soil-dwelling plant pathogens and play a role in the ecological competence of phenazine-producing Pseudomonas spp. We assembled a collection encompassing 63 strains representative of the worldwide diversity of plant-beneficial phenazine-producing Pseudomonas spp. In this study, we report the sequencing of 58 complete genomes using PacBio RS II sequencing technology. Distributed among four subgroups within the P. fluorescens species complex, the diversity of our…

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Tuesday, April 21, 2020

Function and Distribution of a Lantipeptide in Strawberry Fusarium Wilt Disease-Suppressive Soils.

Streptomyces griseus S4-7 is representative of strains responsible for the specific soil suppressiveness of Fusarium wilt of strawberry caused by Fusarium oxysporum f. sp. fragariae. Members of the genus Streptomyces secrete diverse secondary metabolites including lantipeptides, heat-stable lanthionine-containing compounds that can exhibit antibiotic activity. In this study, a class II lantipeptide provisionally named grisin, of previously unknown biological function, was shown to inhibit F. oxysporum. The inhibitory activity of grisin distinguishes it from other class II lantipeptides from Streptomyces spp. Results of quantitative reverse transcription-polymerase chain reaction with lanM-specific primers showed that the density of grisin-producing Streptomyces spp. in the…

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Tuesday, April 21, 2020

Genomic Plasticity Mediated by Transposable Elements in the Plant Pathogenic Fungus Colletotrichum higginsianum.

Phytopathogen genomes are under constant pressure to change, as pathogens are locked in an evolutionary arms race with their hosts, where pathogens evolve effector genes to manipulate their hosts, whereas the hosts evolve immune components to recognize the products of these genes. Colletotrichum higginsianum (Ch), a fungal pathogen with no known sexual morph, infects Brassicaceae plants including Arabidopsis thaliana. Previous studies revealed that Ch differs in its virulence toward various Arabidopsis thaliana ecotypes, indicating the existence of coevolutionary selective pressures. However, between-strain genomic variations in Ch have not been studied. Here, we sequenced and assembled the genome of a Ch…

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Tuesday, April 21, 2020

Detection of Fusarium oxysporum f. sp. fragariae from Infected Strawberry Plants.

Isolates of the Fusarium oxysporum species complex have been characterized as plant pathogens that commonly cause vascular wilt, stunting, and yellowing of the leaves in a variety of hosts. F. oxysporum species complex isolates have been grouped into formae speciales based on their ability to cause disease on a specific host. F. oxysporum f. sp. fragariae is the causal agent of Fusarium wilt of strawberry and has become a threat to production as fumigation practices have changed in California. F. oxysporum f. sp. fragariae is polyphyletic and limited genetic markers are available for its detection. In this study, next-generation sequencing…

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