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Pacific Biosciences
May 4, 2017

Sequencing and de novo assembly of a near complete indica rice genome.

A high-quality reference genome is critical for understanding genome structure, genetic variation and evolution of an organism. Here we report the de novo assembly of an indica rice genome Shuhui498 (R498) through the integration of single-molecule sequencing and mapping data, genetic map and fosmid sequence tags. The 390.3?Mb assembly is estimated to cover more than 99% of the R498 genome and is more continuous than the current reference genomes of japonica rice Nipponbare (MSU7) and Arabidopsis thaliana (TAIR10). We annotate high-quality protein-coding genes in R498 and identify genetic variations between R498 and Nipponbare and presence/absence variations by comparing them to…

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April 7, 2017

Complete genome sequence of Kosakonia oryzae type strain Ola 51(T).

Strain Ola 51(T) (=LMG 24251(T)?=?CGMCC 1.7012(T)) is the type strain of the species Kosakonia oryzae and was isolated from surface-sterilized roots of the wild rice species Oryza latifolia grown in Guangdong, China. Here we summarize the features of the strain Ola 51(T) and describe its complete genome sequence. The genome contains one circular chromosome of 5,303,342 nucleotides with 54.01% GC content, 4773 protein-coding genes, 16 rRNA genes, 76 tRNA genes, 13 ncRNA genes, 48 pseudo genes, and 1 CRISPR array.

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February 16, 2017

Genome sequence of a unique Magnaporthe oryzae RMg-Dl isolate from India that causes blast disease in diverse cereal crops, obtained using PacBio single-molecule and Illumina HiSeq2500 sequencing.

The whole-genome assembly of a unique rice isolate from India, Magnaporthe oryzae RMg-Dl that causes blast disease in diverse cereal crops is presented. Analysis of the 34.82 Mb genome sequence will aid in better understanding the genetic determinants of host range, host jump, survival, pathogenicity, and virulence factors of M. oryzae. Copyright © 2017 Kumar et al.

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January 16, 2017

PAG PacBio Workshop: Introducing 5 new high-quality PacBio genome assemblies for rice to help solve the 10-billion people question

At PAG 2017, Rod Wing presented five new, high-quality rice genome assemblies developed with SMRT Sequencing, including one that has eight complete chromosomes including centromeres. He also offered an early look at data generated with the Sequel System for a new assembly underway. This work is done with the goal of developing rice varieties that will be better suited to feeding a rapidly growing global population.

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October 15, 2016

Genome puzzle master (GPM): an integrated pipeline for building and editing pseudomolecules from fragmented sequences.

Next generation sequencing technologies have revolutionized our ability to rapidly and affordably generate vast quantities of sequence data. Once generated, raw sequences are assembled into contigs or scaffolds. However, these assemblies are mostly fragmented and inaccurate at the whole genome scale, largely due to the inability to integrate additional informative datasets (e.g. physical, optical and genetic maps). To address this problem, we developed a semi-automated software tool-Genome Puzzle Master (GPM)-that enables the integration of additional genomic signposts to edit and build 'new-gen-assemblies' that result in high-quality 'annotation-ready' pseudomolecules.With GPM, loaded datasets can be connected to each other via their logical…

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September 26, 2016

Effector diversification contributes to Xanthomonas oryzae pv. oryzae phenotypic adaptation in a semi-isolated environment.

Understanding the processes that shaped contemporary pathogen populations in agricultural landscapes is quite important to define appropriate management strategies and to support crop improvement efforts. Here, we took advantage of an historical record to examine the adaptation pathway of the rice pathogen Xanthomonas oryzae pv. oryzae (Xoo) in a semi-isolated environment represented in the Philippine archipelago. By comparing genomes of key Xoo groups we showed that modern populations derived from three Asian lineages. We also showed that diversification of virulence factors occurred within each lineage, most likely driven by host adaptation, and it was essential to shape contemporary pathogen races.…

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August 30, 2016

Extensive sequence divergence between the reference genomes of two elite indica rice varieties Zhenshan 97 and Minghui 63.

Asian cultivated rice consists of two subspecies: Oryza sativa subsp. indica and O. sativa subsp. japonica Despite the fact that indica rice accounts for over 70% of total rice production worldwide and is genetically much more diverse, a high-quality reference genome for indica rice has yet to be published. We conducted map-based sequencing of two indica rice lines, Zhenshan 97 (ZS97) and Minghui 63 (MH63), which represent the two major varietal groups of the indica subspecies and are the parents of an elite Chinese hybrid. The genome sequences were assembled into 237 (ZS97) and 181 (MH63) contigs, with an accuracy…

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June 10, 2016

Complete genome sequence of Pseudomonas azotoformans S4, a potential biocontrol bacterium.

Pseudomonas azotoformans is a Gram-negative bacterium and infects cereal grains, especially rice. P. azotoformans S4 from soil sample derived from Lijiang, Yunnan Province, China, appeared to be strong inhibitory activity against Fusarium fujikurio, a serious rice fungal pathogen. Here, we present the complete genome of P. azotoformans S4, which consists of 6,859,618bp with a circle chromosome, 5991 coding DNA sequences, 70 tRNA and 19 rRNA. The genomic analysis revealed that 9 candidate gene clusters are involved in the biosynthesis of secondary metabolites. Copyright © 2016. Published by Elsevier B.V.

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April 1, 2016

Single-molecule sequencing assists genome assembly improvement and structural variation inference.

Dear editor, The single-molecule real-time (SMRT) sequencing platform presented by Pacific Biosciences (PacBio) is regarded as a third-generation sequencing technology (Eid et al., 2009, Roberts et al., 2013). PacBio delivers long reads from several to tens of kilobases (kbs), which are ideal for filling unsequenced gaps due to unusual sequence contexts, such as high-GC content or repeat-rich regions (Bashir et al., 2012, Berlin et al., 2015, Chaisson et al., 2015). PacBio long reads are also favorable for detecting large DNA fragments harboring structural variations (SVs), such as inversions, translocations, duplications, and large insertions/deletions (indels) (Ritz et al., 2010, English et…

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March 16, 2016

Indica rice genome assembly, annotation and mining of blast disease resistance genes.

Rice is a major staple food crop in the world. Over 80 % of rice cultivation area is under indica rice. Currently, genomic resources are lacking for indica as compared to japonica rice. In this study, we generated deep-sequencing data (Illumina and Pacific Biosciences sequencing) for one of the indica rice cultivars, HR-12 from India.We assembled over 86 % (389 Mb) of rice genome and annotated 56,284 protein-coding genes from HR-12 genome using Illumina and PacBio sequencing. Comprehensive comparative analyses between indica and japonica subspecies genomes revealed a large number of indica specific variants including SSRs, SNPs and InDels. To mine disease resistance…

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February 15, 2016

AnnoTALE: bioinformatics tools for identification, annotation, and nomenclature of TALEs from Xanthomonas genomic sequences.

Transcription activator-like effectors (TALEs) are virulence factors, produced by the bacterial plant-pathogen Xanthomonas, that function as gene activators inside plant cells. Although the contribution of individual TALEs to infectivity has been shown, the specific roles of most TALEs, and the overall TALE diversity in Xanthomonas spp. is not known. TALEs possess a highly repetitive DNA-binding domain, which is notoriously difficult to sequence. Here, we describe an improved method for characterizing TALE genes by the use of PacBio sequencing. We present 'AnnoTALE', a suite of applications for the analysis and annotation of TALE genes from Xanthomonas genomes, and for grouping similar…

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February 11, 2016

Complete genome sequence of the African strain AXO1947 of Xanthomonas oryzae pv. oryzae.

Xanthomonas oryzae pv. oryzae is the etiological agent of bacterial rice blight. Three distinct clades of X. oryzae pv. oryzae are known. We present the complete annotated genome of the African clade strain AXO194 using long-read single-molecule PacBio sequencing technology. The genome comprises a single chromosome of 4,674,975 bp and encodes for nine transcriptional activator-like (TAL) effectors. The approach and data presented in this announcement provide information for complex bacterial genome organization and the discovery of new virulence effectors, and they facilitate target characterization of TAL effectors. Copyright © 2016 Huguet-Tapia et al.

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February 5, 2016

Genome of Cnaphalocrocis medinalis granulovirus, the first Crambidae-infecting betabaculovirus isolated from rice leaffolder to sequenced.

Cnaphalocrocis medinalis is a major pest of rice in South and South-East Asia. Insecticides are the major means farmers use for management. A naturally occurring baculovirus, C. medinalis granulovirus (CnmeGV), has been isolated from the larvae and this has the potential for use as microbial agent. Here, we described the complete genome sequence of CnmeGV and compared it to other baculovirus genomes. The genome of CnmeGV is 112,060 base pairs in length, has a G+C content of 35.2%. It contains 133 putative open reading frames (ORFs) of at least 150 nucleotides. A hundred and one (101) of these ORFs are…

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January 10, 2016

PAG Conference: Sequencing and assembly of the rice variety N22 (aus group) – A new reference genome to study comparative, evolutionary and functional genomics of rice

David Kudrna, Rod Wing, and the Arizona Genomics Institute (AGI) plan to fully sequence and annotate the genomes and transcriptomes of 3-4 accessions from each of the estimated 9-15 subpopulation of rice. These subpopulation-specific references will be used to map resequencing data of 3,000 individuals for variation discovery, GWAS, and genomic selection studies to address important traits such as biotic and abiotic stress tolerances, yield, and grain quality. Here Dr. Kudrna presents the first high-quality genome sequence of the rice variety Nagina22. AGI produced and assembled 65-fold coverage of SMRT Sequencing data, resulting in an assembly of 373 Mb with…

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