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January 10, 2016

PAG Conference: Wild rice genome sequences explain the evolution and domestication of Japonica and Indica rice

Robert Henry, Professor of Innovation in Agriculture and Director of the Queensland Alliance for Agriculture and Food Innovation at the University of Queensland, Australia, discusses how whole genome analysis of Australian wild rice is being used to better understand rice domestication, with the goal of making a diverse genetic resource available for increased rice food security worldwide. The wild "A genome" species represent an effective gene pool for rice. SMRT Sequencing and assembly of two taxon of wild Australian rice has allowed analysis of the relationships with this group. Domesticated rice (Oryza sativa ssp. japonica) nuclear genome shows close relationship…

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December 1, 2015

Transcriptome-wide investigation of circular RNAs in rice.

Various stable circular RNAs (circRNAs) are newly identified to be the abundance of noncoding RNAs in Archaea, Caenorhabditis elegans, mice, and humans through high-throughput deep sequencing coupled with analysis of massive transcriptional data. CircRNAs play important roles in miRNA function and transcriptional controlling by acting as competing endogenous RNAs or positive regulators on their parent coding genes. However, little is known regarding circRNAs in plants. Here, we report 2354 rice circRNAs that were identified through deep sequencing and computational analysis of ssRNA-seq data. Among them, 1356 are exonic circRNAs. Some circRNAs exhibit tissue-specific expression. Rice circRNAs have a considerable number…

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November 13, 2015

A knowledge-based molecular screen uncovers a broad-spectrum OsSWEET14 resistance allele to bacterial blight from wild rice.

Transcription activator-like (TAL) effectors are type III-delivered transcription factors that enhance the virulence of plant pathogenic Xanthomonas species through the activation of host susceptibility (S) genes. TAL effectors recognize their DNA target(s) via a partially degenerate code, whereby modular repeats in the TAL effector bind to nucleotide sequences in the host promoter. Although this knowledge has greatly facilitated our power to identify new S genes, it can also be easily used to screen plant genomes for variations in TAL effector target sequences and to predict for loss-of-function gene candidates in silico. In a proof-of-principle experiment, we screened a germplasm of…

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August 10, 2015

Full genome sequence of Brevibacillus laterosporus strain B9, a biological control strain isolated from Zhejiang, China.

Brevibacillus laterosporus was newly classified from Bacillus laterosporus, which has ability to be used as a biological control agent in crop field. B. laterosporus strain B9 is an aerobic, motile, Gram-positive, spore-forming rod that was isolated from a field of Oryza sativa in Zhejiang, China in 2011. This bacterium has been confirmed to be a strong antagonist against bacterial brown strip of rice caused by Acidovorex avenae subsp. avenae. Here we describe the features of B. laterosporus strain B9, together with the complete genome sequence and its annotation. The 5,272,435bp genome contains 4804 protein-coding genes and 227 RNA-only encoding genes…

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July 20, 2015

Genome sequence of Pseudomonas parafulva CRS01-1, an antagonistic bacterium isolated from rice field.

Pseudomonas parafulva (formerly known as Pseudomonas fulva) is an antagonistic bacterium against several rice bacterial and fungal diseases. The total genome size of P. parafulva CRS01-1 is 5,087,619bp with 4389 coding sequences (CDSs), 77 tRNAs, and 7 rRNAs. The annotated full genome sequence of the P. parafulva CRS01-1 strain might shed light on its role as an antagonistic bacterium. Copyright © 2015. Published by Elsevier B.V.

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July 1, 2015

Genome sequence of Xanthomonas sacchari R1, a biocontrol bacterium isolated from the rice seed.

Xanthomonas sacchari, was first identified as a pathogenic bacterium isolated from diseased sugarcane in Guadeloupe. In this study, R1 was first isolated from rice seed samples from Philippines in 2002. The antagonistic ability against several rice pathogens raises our attention. The genomic feature of this strain was described in this paper. The total genome size of X. sacchari R1 is 5,000,479bp with 4315 coding sequences (CDS), 59 tRNAs, 2rRNAs and one plasmid. Copyright © 2015. Published by Elsevier B.V.

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July 1, 2015

Complete genome sequence of Deinococcus soli N5(T), a gamma-radiation- resistant bacterium isolated from rice field in South Korea.

A Gram-negative, non-motile and short-rod shaped and gamma-radiation-resistant bacterium Deinococcus soli N5(T), isolated from a rice field soil in South Korea. The complete genome of D. soli N5(T) consists of a chromosome (3,236,984bp). The key enzymes for the central DNA repair mechanisms were present in the genome. The enzyme coding genes has been identified which is involving in the nucleotide excision repair (NER) pathway. The gene cluster in the genome sequence suggest that the D. soli N5(T) use (NER) pathways for efficient removal of pyrimidine dimers that are the most abundant type of UV- induced damage. Copyright © 2015 Elsevier…

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July 1, 2015

TAL effectors and activation of predicted host targets distinguish Asian from African strains of the rice pathogen Xanthomonas oryzae pv. oryzicola while strict conservation suggests universal importance of five TAL effectors.

Xanthomonas oryzae pv. oryzicola (Xoc) causes the increasingly important disease bacterial leaf streak of rice (BLS) in part by type III delivery of repeat-rich transcription activator-like (TAL) effectors to upregulate host susceptibility genes. By pathogen whole genome, single molecule, real-time sequencing and host RNA sequencing, we compared TAL effector content and rice transcriptional responses across 10 geographically diverse Xoc strains. TAL effector content is surprisingly conserved overall, yet distinguishes Asian from African isolates. Five TAL effectors are conserved across all strains. In a prior laboratory assay in rice cv. Nipponbare, only two contributed to virulence in strain BLS256 but the…

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May 26, 2015

Podcast: The 9 billion people problem – Rod Wing on plant genomics

By 2050, there will be 9 billion people on the planet. What will they eat? This is the question that led Rod Wing, Director of the Arizona Genomics Institute, into the field of plant genomics. What has been accomplished so far in the mission to come up with some super green crops? And how does Rod see anti-GMO sentiment and the recent trend toward gluten free diets factoring in? After answering these questions, he dives into a discussion on which sequencing instruments he has used for plant work. Unsurprisingly, Rod prefers the PacBio long reads even though the cost is…

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May 1, 2015

Gene targeting by the TAL effector PthXo2 reveals cryptic resistance gene for bacterial blight of rice.

Bacterial blight of rice is caused by the ?-proteobacterium Xanthomonas oryzae pv. oryzae, which utilizes a group of type III TAL (transcription activator-like) effectors to induce host gene expression and condition host susceptibility. Five SWEET genes are functionally redundant to support bacterial disease, but only two were experimentally proven targets of natural TAL effectors. Here, we report the identification of the sucrose transporter gene OsSWEET13 as the disease-susceptibility gene for PthXo2 and the existence of cryptic recessive resistance to PthXo2-dependent X. oryzae pv. oryzae due to promoter variations of OsSWEET13 in japonica rice. PthXo2-containing strains induce OsSWEET13 in indica rice IR24 due…

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April 17, 2015

Case Study: Scientists create gold standard plant and animal genomes with SMRT Sequencing

From crop improvement to breeding healthier livestock to modeling human disease, scientists are using PacBio Sequencing to advance understanding of plant and animal genomes. In this article, we look at four examples of plant and animal genome references improved or made possible with SMRT Sequencing, including an early example of transcriptome sequencing of a chicken for improved annotation. These examples highlight insights gained with SMRT Sequencing that are missed with short-read data, such as complex regions or novel genes.

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January 13, 2015

The resurgence of reference quality genome sequence.

Since the advent of Next-Generation Sequencing (NGS), the cost of de novo genome sequencing and assembly have dropped precipitately, which has spurred interest in genome sequencing overall. Unfortunately the contiguity of the NGS assembled sequences, as well as the accuracy of these assemblies have suffered. Additionally, most NGS de novo assemblies leave large portions of genomes unresolved, and repetitive regions are often collapsed. When compared to the reference quality genome sequences produced before the NGS era, the new sequences are highly fragmented and often prove to be difficult to properly annotate. In some cases the contiguous portions are smaller than…

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January 9, 2015

Rapid full-length Iso-Seq cDNA sequencing of rice mRNA to facilitate annotation and identify splice-site variation.

PacBio’s new Iso-Seq technology allows for rapid generation of full-length cDNA sequences without the need for assembly steps. The technology was tested on leaf mRNA from two model O. sativa ssp. indica cultivars – Minghui 63 and Zhenshan 97. Even though each transcriptome was not exhaustively sequenced, several thousand isoforms described genes over a wide size range, most of which are not present in any currently available FL cDNA collection. In addition, the lack of an assembly requirement provides direct and immediate access to complete mRNA sequences and rapid unraveling of biological novelties.

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July 27, 2014

The genome sequence of African rice (Oryza glaberrima) and evidence for independent domestication.

The cultivation of rice in Africa dates back more than 3,000 years. Interestingly, African rice is not of the same origin as Asian rice (Oryza sativa L.) but rather is an entirely different species (i.e., Oryza glaberrima Steud.). Here we present a high-quality assembly and annotation of the O. glaberrima genome and detailed analyses of its evolutionary history of domestication and selection. Population genomics analyses of 20 O. glaberrima and 94 Oryza barthii accessions support the hypothesis that O. glaberrima was domesticated in a single region along the Niger river as opposed to noncentric domestication events across Africa. We detected…

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