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Rescooped by bikai from Plant-Microbe Interaction!

Genome Announcements: Several plant pathogen genomes published in the issue of May/June 2013; 1 (3

Draft Genome Sequence of Botrytis cinerea BcDW1, Inoculum for Noble Rot of Grape Berries

Barbara Blanco-Ulate, Greg Allen, Ann L. T. Powell, and Dario CantuGenome Announc. May/June 2013 1:e00252-13; doi:10.1128/genomeA.00252-13


Draft Genome Sequence of the Grapevine Dieback Fungus Eutypa lata UCR-EL1

Barbara Blanco-Ulate, Philippe E. Rolshausen, and Dario CantuGenome Announc. May/June 2013 1:e00228-13; doi:10.1128/genomeA.00228-13


Draft Genome Sequence of Neofusicoccum parvum Isolate UCR-NP2, a Fungal Vascular Pathogen Associated with Grapevine Cankers

Barbara Blanco-Ulate, Philippe Rolshausen, and Dario CantuGenome Announc. May/June 2013 1:e00339-13; doi:10.1128/genomeA.00339-13


Draft Genome Sequence of the Ascomycete Phaeoacremonium aleophilum Strain UCR-PA7, a Causal Agent of the Esca Disease Complex in Grapevines

Barbara Blanco-Ulate, Philippe Rolshausen, and Dario CantuGenome Announc. May/June 2013 1:e00390-13; doi:10.1128/genomeA.00390-13


Genome Sequencing of Ralstonia solanacearum FQY_4, Isolated from a Bacterial Wilt Nursery Used for Breeding Crop Resistance

Yi Cao, Baoyu Tian, Yanxia Liu, Liuti Cai, Hancheng Wang, Ning Lu, Maosheng Wang, Shenghua Shang, Zhengyou Luo, and Junxiong ShiGenome Announc. May/June 2013 1:e00125-13; doi:10.1128/genomeA.00125-13


Draft Genome Sequence of Erwinia toletana, a Bacterium Associated with Olive Knots Caused by Pseudomonas savastanoi pv. Savastanoi

Daniel Passos da Silva, Giulia Devescovi, Konrad Paszkiewicz, Chiaraluce Moretti, Roberto Buonaurio, David J. Studholme, and Vittorio VenturiGenome Announc. May/June 2013 1:e00205-13; doi:10.1128/genomeA.00205-13


Genome Sequences of Pseudomonas spp. Isolated from Cereal CropsDonald M. Gardiner, Jiri Stiller, Lorenzo Covarelli, Magdalen Lindeberg, Roger G. Shivas, and John M. MannersGenome Announc. May/June 2013 1:e00209-13; doi:10.1128/genomeA.00209-13


Complete Genome Sequence of Xanthomonas citri subsp. citri Strain Aw12879, a Restricted-Host-Range Citrus Canker-Causing Bacterium

Neha Jalan, Dibyendu Kumar, Fahong Yu, Jeffrey B. Jones, James H. Graham, and Nian WangGenome Announc. May/June 2013 1:e00235-13; doi:10.1128/genomeA.00235-13


Genome Sequence of Xanthomonas arboricola pv. Corylina, Isolated from Turkish Filbert in Colorado

Jorge Ibarra Caballero, Marcelo M. Zerillo, Jacob Snelling, Christina Boucher, and Ned TisseratGenome Announc. May/June 2013 1:e00246-13; doi:10.1128/genomeA.00246-13


Genome Sequence of the Banana Pathogen Dickeya zeae Strain MS1, Which Causes Bacterial Soft Rot

Jing-Xin Zhang, Bi-Run Lin, Hui-Fang Shen, and Xiao-Ming PuGenome Announc. May/June 2013 1:e00317-13; doi:10.1128/genomeA.00317-13


Genome Sequence of the Pectobacterium atrosepticum Strain CFBP6276, Causing Blackleg and Soft Rot Diseases on Potato Plants and Tubers

Anthony Kwasiborski, Samuel Mondy, Amélie Beury-Cirou, and Denis FaureGenome Announc. May/June 2013 1:e00374-13; doi:10.1128/genomeA.00374-13


Complete Genome Sequences of Two Sweet Potato Chlorotic Stunt Virus Isolates from China

Yanhong Qin, Zhenchen Zhang, Qi Qiao, Desheng Zhang, Yuting Tian, Yongjiang Wang, and Shuang WangGenome Announc. May/June 2013 1:e00218-13; doi:10.1128/genomeA.00218-13

Via Nicolas Denancé, Guogen Yang
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Rescooped by bikai from Plant Pathogenomics!

Genome Research: The making of a new pathogen: Insights from comparative population genomics of the domesticated wheat pathogen Mycosphaerella graminicola and its wild sister species

The fungus Mycosphaerella graminicola emerged as a new pathogen of cultivated wheat during its domestication ∼11,000 yr ago. We assembled 12 high-quality full genome sequences to investigate the genetic footprints of selection in this wheat pathogen and closely related sister species that infect wild grasses. We demonstrate a strong effect of natural selection in shaping the pathogen genomes with only ∼3% of nonsynonymous mutations being effectively neutral. Forty percent of all fixed nonsynonymous substitutions, on the other hand, are driven by positive selection. Adaptive evolution has affected M. graminicola to the highest extent, consistent with recent host specialization. Positive selection has prominently altered genes encoding secreted proteins and putative pathogen effectors supporting the premise that molecular host–pathogen interaction is a strong driver of pathogen evolution. Recent divergence between pathogen sister species is attested by the high degree of incomplete lineage sorting (ILS) in their genomes. We exploit ILS to generate a genetic map of the species without any crossing data, document recent times of species divergence relative to genome divergence, and show that gene-rich regions or regions with low recombination experience stronger effects of natural selection on neutral diversity. Emergence of a new agricultural host selected a highly specialized and fast-evolving pathogen with unique evolutionary patterns compared with its wild relatives. The strong impact of natural selection, we document, is at odds with the small effective population sizes estimated and suggest that population sizes were historically large but likely unstable.

Via Kamoun Lab @ TSL
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