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Authors: Ramírez-Puebla, Shamayim T and Hernández, Marco A Rogel and Guerrero Ruiz, Gabriela and Ormeño-Orrillo, Ernesto and Martinez-Romero, Julio C and Servín-Garcidueñas, Luis Eduardo and Núñez-de la Mora, Alejandra and Amescua-Villela, Guadalupe and Negrete-Yankelevich, Simoneta and Martínez-Romero, Esperanza

Phaseolus dumosus is an endemic species from mountain tops in Mexico that was found in traditional agriculture areas in Veracruz, Mexico. P. dumosus plants were identified by ITS sequences and their nodules were collected from agricultural fields or from trap plant experiments in the laboratory. Bacteria from P. dumosus nodules were identified as belonging to the phaseoli-etli-leguminosarum (PEL) or to the tropici group by 16S rRNA gene sequences. We obtained complete closed genomes from two P. dumosus isolates CCGE531 and CCGE532 that were phylogenetically placed within the tropici group but with a distinctive phylogenomic position and low average nucleotide identity (ANI). CCGE531 and CCGE532 had common phenotypic characteristics with tropici type B rhizobial symbionts. Genome synteny analysis and ANI showed that P. dumosus isolates had different chromids and our analysis suggests that chromids have independently evolved in different lineages of the Rhizobium genus. Finally, we considered that P. dumosus and Phaseolus vulgaris plants belong to the same cross-inoculation group since they have conserved symbiotic affinites for rhizobia.Copyright © 2018 Elsevier GmbH. All rights reserved.

Journal: Systematic and applied microbiology
DOI: 10.1016/j.syapm.2018.12.007
Year: 2019

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