Abstract
Paraburkholderia tropica (syn Burkholderia tropica) are nitrogen-fixing bacteria commonly found in sugarcane. The Paraburkholderia tropica strain Ppe8 is part of the sugarcane inoculant consortium that has a beneficial effect on yield. Here, we report a draft genome sequence of this strain elucidating the mechanisms involved in its interaction mainly with Poaceae. A genome size of approximately 8.75 Mb containing 7844 protein coding genes distributed in 526 subsystems was de novo assembled with ABySS and annotated by RAST. Genes related to the nitrogen fixation process, the secretion systems (I, II, III, IV, and VI), and related to a variety of metabolic traits, such as metabolism of carbohydrates, amino acids, vitamins, and proteins, were detected, suggesting a broad metabolic capacity and possible adaptation to plant association.
Keywords:
Diazotrophic; Next generation sequencing; Nitrogen-fixing; Secretion system
Genome announcement
The genus Burkholderia contains 96 species and was recently divided due to the creation of a new genus named Paraburkholderia.11 Sawana A, Adeolu M, Gupta RS. Molecular signatures and phylogenomic analysis of the genus Burkholderia: proposal for division of this genus into the emended genus Burkholderia containing pathogenic organisms and a new genus Paraburkholderia gen. nov. harboring environmental species. Front Genet. 2014;5:429.,22 Oren A, Garrity GM. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol. 2015;65:2017-2025. This new genus is composed of 46 species isolated mainly from rhizosphere soil and plant tissues11 Sawana A, Adeolu M, Gupta RS. Molecular signatures and phylogenomic analysis of the genus Burkholderia: proposal for division of this genus into the emended genus Burkholderia containing pathogenic organisms and a new genus Paraburkholderia gen. nov. harboring environmental species. Front Genet. 2014;5:429.,22 Oren A, Garrity GM. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol. 2015;65:2017-2025. and includes the older nitrogen-fixing species, B. tropica, B. unamae, and B. silvatlantica, which are all associated with non-legume plants.33 Reis VM, Estrada-de los Santos P, Tenorio-Salgado S, et al. Burkholderia tropica sp. nov., a novel nitrogen-fixing, plant-associated bacterium. Int J Syst Evol Microbiol. 2004;54:2155-2162.
4 Caballero-Mellado J, Martínez-Aguilar L, Paredes-Valdez G, Estrada-De-Los Santos P. Burkholderia unamae sp. nov., an N2-fixing rhizospheric and endophytic species. Int J Syst Evol Microbiol. 2004;54:1165-1172.-55 Perin L, Martínez-Aguilar L, Paredes-Valdez G, et al. Burkholderia silvatlantica sp. nov., a diazotrophic bacterium associated with sugar cane and maize. Int J Syst Evol Microbiol. 2006;56:1931-1937.
Paraburkholderia tropica (basonym: Burkholderia tropica33 Reis VM, Estrada-de los Santos P, Tenorio-Salgado S, et al. Burkholderia tropica sp. nov., a novel nitrogen-fixing, plant-associated bacterium. Int J Syst Evol Microbiol. 2004;54:2155-2162.) was first isolated from the sugarcane stem. In addition to nitrogen fixation, it is capable of promoting plant growth and acts as a biological control agent. P. tropica strain Ppe8 is part of the sugarcane consortium inoculant, developed by The Brazilian Agricultural Research Corporation (Embrapa), which promotes sugarcane yield increments in the field.66 Tenorio-Salgado S, Tinoco R, Vazquez-duhalt R, Caballero-Mellado J, Perez-Rueda E. Identification of volatile compounds produced by the bacterium Burkholderia tropica that inhibit the growth of fungal pathogens. Bioengineered. 2013;4:236-243.
7 Bernabeu PR, Pistorio M, Torres-Tejerizo G, et al. Colonization and plant growth-promotion of tomato by Burkholderia tropica. Sci Hortic. 2015;191:113-120.
8 Reis V, Baldani J, Urquiaga S. Recommendation of a Mixture of Five Nitrogen-Fixing Bacteria for Sugarcane Inoculation: Gluconacetobacter diazotrophicus (BR 11281), Herbaspirillum seropedicae (BR 113435), Herbaspirillum rubrisubalbicans (BR11504), Azospirillum amazonense (BR 11145) e Burkholderia tropica (BR 11366). Seropedica: Embrapa Agrobiology; 2009.-99 Schultz N, Morais RFD, Alves J, et al. Avaliação agronômica de variedades de cana-de-açúcar inoculadas com bactérias diazotróficas e adubadas com nitrogênio. Pesqui Agropecu Bras. 2012;47:261-268. Due to its agronomical importance and biotechnological potential, the genome of P. tropica strain Ppe8 was sequenced to identify genes potentially associated with these beneficial characteristics.
The P. tropica strain Ppe8 (BR11366) was provided by the Johanna Döbereiner Biological Resource Center (CRB-JD) at Embrapa Agrobiologia. Genomic DNA was prepared from an overnight (18 h) culture of P. tropica Ppe8 grown in JMV liquid medium using the Wizard® Genomic DNA Purification Kit (Promega, USA). The genome sequence of Ppe8 was performed by Macrogen Company (South Korea) using the 100 bp paired-end library in Illumina MiSeq platform. It generated 1,845,481,494 bases (1.8 Gb) of sequence data with an average genome coverage of 208X. The reads were trimmed using FASTX-Toolkit (http://hannonlab.cshl.edu/fastx_toolkit) and only bases with a quality above 20 (Q20) were used to assembly the genome. The ABySS software version 1.9.01010 Simpson J, Wong K, Jackman S. ABySS: a parallel assembler for short read sequence data. Genome Res. 2009;19:1117-1123. was used for de novo assembly and contigs shorter than 200 bp were eliminated. Annotation and identification of metabolic pathways for the draft genome was performed using the RAST version 2.0 server.1111 Overbeek R, Olson R, Pusch GD, et al. The SEED and the Rapid Annotation of microbial genomes using Subsystems Technology (RAST). Nucleic Acids Res. 2014;42:D206-D214.
The genome has approximately 8.75 Mb and contains 7844 Coding DNA Sequences (CDSs) distributed across 526 subsystems (functional metabolic pathway or cellular structure of a set of homologous genes in different genomes), G+C content of 64.7 (%) and 78 RNAs, including rRNAs, tRNAs and ncRNA. The most abundant subsystem was "amino acids and derivate" (789 genes), followed by "carbohydrates" (764 genes), "cofactors, vitamins, prosthetic groups, and pigments" (409 genes), "fatty acids, lipids, and isoprenoids" (334 genes), and "metabolism of proteins" (314 genes). The regulation of nitrogen metabolism is quite diverse with 56 genes involved in several processes, such as, allantoin utilization (6), nitrosative stress (3), amidase clustered with urea and nitrile hydratase functions (2), nitrate and nitrite ammonification (21), ammonia assimilation (18), nitrilase (2), and denitrification (4). In addition, the structural organization of 20 genes related to nitrogen fixation (nif genes) was very similar to other nitrogen-fixing Paraburkholderia species, such as P. kururiensis. Furthermore, 264 genes related to membrane transport, including different secretion systems such as type I (hlyD and tolC genes), II (ORFs _638, _4162 and others genes), III (epaP, epaO, hrpB2, sctV, sctS, sctL, sctU, stcC, sctD, and others), IV (virJ), and VI (liP2 and hsiJ2 genes), which are involved in fiber secretion system, type IV pilus, and conjugative transfer, were identified. ABC transports, cation transporters, and uni-, sym-, and anti-protons systems were also detected, suggesting that the bacteria have a broad capacity to transport different molecules.
The assembled contigs were deposited in the DDBJ/ENA/GenBank and published with the accession number MSDZ00000000.1; BioSample: SAMN06166932. The version described in this paper is the first version of the genome sequence deposited.
Acknowledgments
This work was partially funded by the projects CNPq/INCT-FBN (no. 573828/2008-3), CNPq-Universal (no. 476254/2013-2), FAPERJ-CNE (no. E26/102.312/2013), and Embrapa (no. 02.13.08.006.00.03.001). Paula Renata Alves da Silva was supported by fellowship from CAPES/EMBRAPA while Jean Luiz Simões-Araújo (no. 309170/2013-3) and José Ivo Baldani (no. 304750/2013) received fellowships from CNPq.
References
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1Sawana A, Adeolu M, Gupta RS. Molecular signatures and phylogenomic analysis of the genus Burkholderia: proposal for division of this genus into the emended genus Burkholderia containing pathogenic organisms and a new genus Paraburkholderia gen. nov. harboring environmental species. Front Genet. 2014;5:429.
-
2Oren A, Garrity GM. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol. 2015;65:2017-2025.
-
3Reis VM, Estrada-de los Santos P, Tenorio-Salgado S, et al. Burkholderia tropica sp. nov., a novel nitrogen-fixing, plant-associated bacterium. Int J Syst Evol Microbiol 2004;54:2155-2162.
-
4Caballero-Mellado J, Martínez-Aguilar L, Paredes-Valdez G, Estrada-De-Los Santos P. Burkholderia unamae sp. nov., an N2-fixing rhizospheric and endophytic species. Int J Syst Evol Microbiol 2004;54:1165-1172.
-
5Perin L, Martínez-Aguilar L, Paredes-Valdez G, et al. Burkholderia silvatlantica sp. nov., a diazotrophic bacterium associated with sugar cane and maize. Int J Syst Evol Microbiol. 2006;56:1931-1937.
-
6Tenorio-Salgado S, Tinoco R, Vazquez-duhalt R, Caballero-Mellado J, Perez-Rueda E. Identification of volatile compounds produced by the bacterium Burkholderia tropica that inhibit the growth of fungal pathogens. Bioengineered 2013;4:236-243.
-
7Bernabeu PR, Pistorio M, Torres-Tejerizo G, et al. Colonization and plant growth-promotion of tomato by Burkholderia tropica. Sci Hortic. 2015;191:113-120.
-
8Reis V, Baldani J, Urquiaga S. Recommendation of a Mixture of Five Nitrogen-Fixing Bacteria for Sugarcane Inoculation: Gluconacetobacter diazotrophicus (BR 11281), Herbaspirillum seropedicae (BR 113435), Herbaspirillum rubrisubalbicans (BR11504), Azospirillum amazonense (BR 11145) e Burkholderia tropica (BR 11366) Seropedica: Embrapa Agrobiology; 2009.
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9Schultz N, Morais RFD, Alves J, et al. Avaliação agronômica de variedades de cana-de-açúcar inoculadas com bactérias diazotróficas e adubadas com nitrogênio. Pesqui Agropecu Bras 2012;47:261-268.
-
10Simpson J, Wong K, Jackman S. ABySS: a parallel assembler for short read sequence data. Genome Res. 2009;19:1117-1123.
-
11Overbeek R, Olson R, Pusch GD, et al. The SEED and the Rapid Annotation of microbial genomes using Subsystems Technology (RAST). Nucleic Acids Res. 2014;42:D206-D214.
Publication Dates
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Publication in this collection
Apr-Jun 2018
History
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Received
24 Mar 2017 -
Accepted
26 July 2017