ABSTRACT
Here, we present the total genome sequence of Pantoea sp. strain paga, a plant-associated bacterium isolated from knots present on olive trees grown on the Adriatic Coast. The genome size of Pantoea sp. paga is 5.08 Mb, with a G+C content of 54%. The genome contains 4,776 predicted coding DNA sequences (CDSs), including 70 tRNA genes and 1 ribosomal operon. Obtained genome sequence data will provide insight on the physiology, ecology, and evolution of Pantoea spp.
ANNOUNCEMENT
Pantoea is a genus of Gram-negative bacteria belonging to phylum Proteobacteria, class Gammaproteobacteria, order Enterobacteriales, family Erwiniaceae. In the olive knot disease, the nonpathogenic bacterial species Pantoea agglomerans and Erwinia toletana, olive plant epiphytes and endophytes, coexist with the pathogenic bacterium Pseudomonas savastanoi pv. savastanoi, the causal agent of disease (1–3).
P. agglomerans strains inhabiting olive trees as nonpathogenic endophytes have been shown to cooperate with strains of P. savastanoi, forming a stable bacterial consortium that increases the severity of disease (1). It has been suggested that the indole-3-acetic acid (IAA) and cytokinins produced by P. agglomerans may increase the size of the knots on olive caused by P. savastanoi and also that the growth of P. agglomerans is apparently supported by the copresence of an actively growing population of P. savastanoi (2).
Bacterial cells were isolated from olive knots isolated in the central region of Dalmatia, Croatia (global positioning system [GPS] coordinates 43°30′19.6″N, 16°29′55.0″E). Fresh olive knots were surface sterilized by 75% ethanol, sliced with a sterile scalpel, and plated onto King’s medium agar plates (4). Plates were kept in the dark at 25°C for 48 h. An isolated single colony was transferred into 10 ml of liquid lysogeny broth (LB) medium and grown at 28°C for 24 h with shaking. DNA was isolated from bacterial cells using a microbial DNA kit (Macherey-Nagel, Hoerdt, France).
Two micrograms of genomic DNA was used for fragmentation and 300-bp library preparation using a Nextera XT DNA library prep kit and protocol (Illumina, Evry, France), and 2 × 150-bp paired-end sequencing was done using Illumina technology at GATC Biotech (Mulhouse, France). Quality controls were made with FastQC (5) and Trimmomatic (6). We obtained a total of 7,822,775 reads, with 462× coverage and a G+C content of 54%. Genome assembly was realized using Unicycler v0.4.3 software, and annotation was done with the MicroScope platform v3.10.0 using default parameters, with a minimum contig length of 200 bp (7–9). The Pantoea sp. genome is assembled in 52 contigs, with the largest contigs of 1,219,567 bp. The genome size has 5,077,592 bp, an N50 value of 580,527 bp, a G+C content of 54.58%, and 4,786 annotated genes.
Data availability.The complete genome sequence described here has been deposited at NCBI/GenBank under BioProject number PRJNA555164, BioSample number SAMN12302724, and GenBank accession number VLTF00000000. Raw reads were deposited at NCBI under SRA accession number SRX6799334. The version described in this paper is the first version. The Pantoea sp. paga strain is available on request from the Institute for Adriatic Crops (IAC).
ACKNOWLEDGMENTS
This work was supported by the Split-Dalmatia County grant for the project “Agents, transmitters and bio-control of olive knot disease in the olive groves of the Split-Dalmatia County” and by the Unity Through Knowledge Fund, collaboration grant 2017 (contract number 10/17) within the Research Cooperability Program. M.R. is a Ph.D. fellow supported by a French government scholarship in 2019/2020 announced by the Ministry of Science and Education of Republic of Croatia, Agency for Mobility and EU Programmes, and Embassy of the French Republic to the Republic of Croatia. The LABGeM (CEA/Genoscope and CNRS UMR8030) and the France Génomique and French Bioinformatics Institute National Infrastructures (funded as part of an Investissement d’Avenir program managed by the Agence Nationale pour la Recherche, contracts ANR-10-INBS-09 and ANR-11-INBS-0013) are acknowledged for support within the MicroScope annotation platform.
We thank platform Genomique Environnementale PGE, UMR, CNRS 5557, for technical support.
We declare no conflict of interest.
FOOTNOTES
- Received 13 August 2019.
- Accepted 1 October 2019.
- Published 17 October 2019.
- Copyright © 2019 Vuletin Selak et al.
This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.