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Tuesday, April 21, 2020

The Chinese chestnut genome: a reference for species restoration

Forest tree species are increasingly subject to severe mortalities from exotic pests, diseases, and invasive organisms, accelerated by climate change. Forest health issues are threatening multiple species and ecosystem sustainability globally. While sources of resistance may be available in related species, or among surviving trees, introgression of resistance genes into threatened tree species in reasonable time frames requires genome-wide breeding tools. Asian species of chestnut (Castanea spp.) are being employed as donors of disease resistance genes to restore native chestnut species in North America and Europe. To aid in the restoration of threatened chestnut species, we present the assembly of…

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Tuesday, April 21, 2020

Genome Sequence Resource of a Puccinia striiformis Isolate infecting wheatgrass.

Stripe rust caused by Puccinia striiformis is a disastrous disease of cereal crops and various grasses. To date, fourteen stripe rust genomes are publicly available, including thirteen P. striiformis f. sp. tritici and one P. striiformis f. sp. hordei. In this study, one isolate (11-281) of P. striiformis collected from wheatgrass (Agropyron cristatum), which is avirulent to most of standard differential genotypes of wheat and barley, was sequenced, assembled, and annotated. The sequences were assembled to a draft genome of 84.75 Mb, which is comparable to previously sequenced P. striiformis f. sp. tritici and P. striiformis f. sp. hordei isolates.…

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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

A high-quality genome assembly from a single, field-collected spotted lanternfly (Lycorma delicatula) using the PacBio Sequel II system

Background A high-quality reference genome is an essential tool for applied and basic research on arthropods. Long-read sequencing technologies may be used to generate more complete and contiguous genome assemblies than alternate technologies; however, long-read methods have historically had greater input DNA requirements and higher costs than next-generation sequencing, which are barriers to their use on many samples. Here, we present a 2.3 Gb de novo genome assembly of a field-collected adult female spotted lanternfly (Lycorma delicatula) using a single Pacific Biosciences SMRT Cell. The spotted lanternfly is an invasive species recently discovered in the northeastern United States that threatens…

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Tuesday, April 21, 2020

Draft Genome Sequence of the Novonestmycin-Producing Strain Streptomyces sp. Z26, Isolated from Potato Rhizosphere in Morocco.

Streptomyces sp. strain Z26 exhibited antifungal activity and turned out to be a producer of the secondary metabolites novonestmycin A and B. The 6.5-Mb draft genome gives insight into the complete secondary metabolite production capacity and builds the basis to find and locate the biosynthetic gene cluster encoding the novonestmycins.

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Tuesday, April 21, 2020

Musa balbisiana genome reveals subgenome evolution and functional divergence.

Banana cultivars (Musa ssp.) are diploid, triploid and tetraploid hybrids derived from Musa acuminata and Musa balbisiana. We presented a high-quality draft genome assembly of M. balbisiana with 430?Mb (87%) assembled into 11?chromosomes. We identified that the recent divergence of M. acuminata (A-genome) and M. balbisiana (B-genome) occurred after lineage-specific whole-genome duplication, and that the B-genome may be more sensitive to the fractionation process compared to the A-genome. Homoeologous exchanges occurred frequently between A- and B-subgenomes in allopolyploids. Genomic variation within progenitors resulted in functional divergence of subgenomes. Global homoeologue expression dominance occurred between subgenomes of the allotriploid. Gene families…

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Tuesday, April 21, 2020

De novo genome assembly of the stress tolerant forest species Casuarina equisetifolia provides insight into secondary growth.

Casuarina equisetifolia (C. equisetifolia), a conifer-like angiosperm with resistance to typhoon and stress tolerance, is mainly cultivated in the coastal areas of Australasia. C. equisetifolia, making it a valuable model to study secondary growth associated genes and stress-tolerance traits. However, the genome sequence is unavailable and therefore wood-associated growth rate and stress resistance at the molecular level is largely unexplored. We therefore constructed a high-quality draft genome sequence of C. equisetifolia by a combination of Illumina second-generation sequencing reads and Pacific Biosciences single-molecule real-time (SMRT) long reads to advance the investigation of this species. Here, we report the genome assembly, which contains approximately…

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Tuesday, April 21, 2020

De novo assembly of white poplar genome and genetic diversity of white poplar population in Irtysh River basin in China.

The white poplar (Populus alba) is widely distributed in Central Asia and Europe. There are natural populations of white poplar in Irtysh River basin in China. It also can be cultivated and grown well in northern China. In this study, we sequenced the genome of P. alba by single-molecule real-time technology. De novo assembly of P. alba had a genome size of 415.99 Mb with a contig N50 of 1.18 Mb. A total of 32,963 protein-coding genes were identified. 45.16% of the genome was annotated as repetitive elements. Genome evolution analysis revealed that divergence between P. alba and Populus trichocarpa…

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Tuesday, April 21, 2020

A high-quality draft genome assembly of Sinella curviseta: A soil model organism (Collembola).

Sinella curviseta, among the most widespread springtails (Collembola) in Northern Hemisphere, has often been treated as a model organism in soil ecology and environmental toxicology. However, little information on its genetic knowledge severely hinders our understanding of its adaptations to the soil habitat. We present the largest genome assembly within Collembola using ~44.86?Gb (118X) of single-molecule real-time Pacific Bioscience Sequel sequencing. The final assembly of 599 scaffolds was ~381.46?Mb with a N50 length of 3.28?Mb, which captured 95.3% complete and 1.5% partial arthropod Benchmarking Universal Single-Copy Orthologs (n?=?1066). Transcripts and circularized mitochondrial genome were also assembled. We predicted 23,943 protein-coding…

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Tuesday, April 21, 2020

The red bayberry genome and genetic basis of sex determination.

Morella rubra, red bayberry, is an economically important fruit tree in south China. Here, we assembled the first high-quality genome for both a female and a male individual of red bayberry. The genome size was 313-Mb, and 90% sequences were assembled into eight pseudo chromosome molecules, with 32 493 predicted genes. By whole-genome comparison between the female and male and association analysis with sequences of bulked and individual DNA samples from female and male, a 59-Kb region determining female was identified and located on distal end of pseudochromosome 8, which contains abundant transposable element and seven putative genes, four of them…

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Tuesday, April 21, 2020

High Quality Draft Genome of Arogyapacha (Trichopus zeylanicus), an Important Medicinal Plant Endemic to Western Ghats of India.

Arogyapacha, the local name of Trichopus zeylanicus, is a rare, indigenous medicinal plant of India. This plant is famous for its traditional use as an instant energy stimulant. So far, no genomic resource is available for this important plant and hence its metabolic pathways are poorly understood. Here, we report on a high-quality draft assembly of approximately 713.4 Mb genome of T. zeylanicus, first draft genome from the genus Trichopus The assembly was generated in a hybrid approach using Illumina short-reads and Pacbio longer-reads. The total assembly comprised of 22601 scaffolds with an N50 value of 433.3 Kb. We predicted…

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Tuesday, April 21, 2020

A High-Quality Draft Genome Sequence of Colletotrichum gloeosporioides sensu stricto SMCG1#C, a Causal Agent of Anthracnose on Cunninghamia lanceolata in China.

Colletotrichum has a broad host range and causes major yield losses of crops. The fungus Colletotrichum gloeosporioides is associated with anthracnose on Chinese fir. In this study, we present a high-quality draft genome sequence of C. gloeosporioides sensu stricto SMCG1#C, providing a reference genomic data for further research on anthracnose of Chinese fir and other hosts.

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