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4. Plasmids of the incompatibility group FIBKoccur in Klebsiella variicolafrom diverse ecological niches

Author

Duran-Bedolla, Josefina, Rodríguez-Medina, Nadia, Dunn, Michael, Mosqueda-García, Dalila, Barrios-Camacho, Humberto, Aguilar-Vera, Alejandro, Aguilar-Vera, Edgar, Suárez-Rodríguez, Ramón, Ramírez-Trujillo, José Augusto, and Garza-Ramos, Ulises

Abstract

Plasmids play a fundamental role in the evolution of bacteria by allowing them to adapt to different environments and acquire, through horizontal transfer, genes that confer resistance to different classes of antibiotics. Using the available in vitro and in silico plasmid typing systems, we analyzed a set of isolates and public genomes of K. variicolato study its plasmid diversity. The resistome, the plasmid multilocus sequence typing (pMLST), and molecular epidemiology using the MLST system were also studied. A high frequency of IncF plasmids from human isolates but lower frequency from plant isolates were found in our strain collection. In silico detection revealed 297 incompatibility (Inc) groups, but the IncFIBK(216/297) predominated in plasmids from human and environmental samples, followed by IncFIIK(89/297) and IncFIA/FIA(HI1) (75/297). These Inc groups were associated with clinically important ESBL (CTX-M-15), carbapenemases (KPC-2 and NDM-1), and colistin-resistant genes which were associated with major sequence types (ST): ST60, ST20, and ST10. In silico MOB typing showed 76% (311/404) of the genomes contained one or more of the six relaxase families with MOBFbeing most abundant. We identified untypeable plasmids carrying blaKPC-2, blaIMP-1, and blaSHV-187but for which a relaxase was found; this may suggest that novel plasmid structures could be emerging in this bacterial species. The plasmid content in K. variicolahas limited diversity, predominantly composed of IncFIBKplasmids dispersed in different STs. Plasmid detection using the replicon and MOB typing scheme provide a broader context of the plasmids in K. variicola. This study showed that whole-sequence-based typing provides current insights of the prevalence of plasmid types and their association with antimicrobial resistant genes in K. variicolaobtained from humans and environmental niches.

Published
2023
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8. Morphological and molecular evidence for a new rhabdochonid species, Rhabdochona (Nematoda: Rhabdochonidae), parasitizing Eugerres mexicanus (Perciformes: Gerreidae), from the Lacantún River in the Biosphere Reserve of Montes Azules, Chiapas, Mexico

Author

Caspeta-Mandujano, Juan Manuel, primary, Salinas-Ocampo, Julio César, additional, Suárez-Rodríguez, Ramón, additional, Martínez-Ramírez, Carlos, additional, and Matamoros, Wilfredo A., additional

Published
2021
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12. Oscheius myriophila (Nematoda: Rhabditida) isolated in sugar cane soils in Mexico with potential to be used as entomopathogenic nematode

Author

del Rocio Castro-Ortega, Iveth, primary, Caspeta-Mandujano, Juan Manuel, additional, Suárez-Rodríguez, Ramón, additional, Peña-Chora, Guadalupe, additional, Ramírez-Trujillo, José Augusto, additional, Cruz-Pérez, Karina, additional, Sosa, Iván Arenas, additional, and Hernández-Velázquez, Víctor Manuel, additional

Published
2020
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13. Overexpression of SlERF3b and SlERF5 in transgenic tomato alters fruit size, number of seeds and promotes early flowering, tolerance to abiotic stress and resistance to Botrytis cinerea infection.

Author

Álvarez‐Gómez, Tania Belen, Ramírez‐Trujillo, José Augusto, Ramírez‐Yáñez, Mario, and Suárez‐Rodríguez, Ramón

Subjects
ABIOTIC stress, BOTRYTIS cinerea, DROUGHT tolerance, FLOWERING time, CELLULAR signal transduction, TRANSGENIC plants, TOMATOES, SEEDS
Abstract

Ethylene response factors (ERFs) are a large family of plant‐specific transcription factors that have been implicated in positively regulating stress responses. The aim of this work was to study the expression pattern of ethylene response factors SlERF1, SlERF3b and SlERF5 in Solanum lycopersicum cv. Ailsa Craig, when subjected to different stress conditions, as well as to determine the overexpression effect in transgenic tomato when exposed to abiotic and biotic stress conditions. Here we report that SlERF1, SlERF3b and SlERF5 genes are differentially upregulated in tomato wild‐type plants grown under either simulated biotic (when trehalose was applied exogenously) and abiotic stress. SlERF5 and SlERF3b are mainly induced under dehydration and salinity conditions; SlERF1 and SlERF5 are upregulated in response to exogenous trehalose, while SlERF3b is downregulated. These results suggest that SlERF3b could be involved in modulating defence responses to abiotic and biotic stresses. The overexpression of SlERF3b and SlERF5 in transgenic tomato plants promotes abiotic stress tolerance as a result of upregulating genes involved to confer stress tolerance such as P5CS and APx, triggering a major cell membrane‐mediated protection against oxidative stress and avoiding chlorophyll degradation under salinity and drought conditions. Transgenic plants overexpressing SlERF3b positively regulates fruit development, seed production and early flowering; however, germination seeds are more sensitive to osmotic stress as compared to saline stress, while SlERF5 transgenic line has better germination rate in saline stress compared to osmotic stress. On the other hand, overexpression of SlERF5 and SlERF3b plays an important role in regulating the immune response against the pathogenic fungus Botrytis cinerea, by positively regulating JA/ET signalling pathways. [ABSTRACT FROM AUTHOR]

Published
2021
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14. Enhanced Tolerance against a Fungal Pathogen and Insect Resistance in Transgenic Tobacco Plants Overexpressing an Endochitinase Gene from Serratia marcescens

Author

Navarro-González, Samantha Sarai, primary, Ramírez-Trujillo, José Augusto, additional, Peña-Chora, Guadalupe, additional, Gaytán, Paul, additional, Roldán-Salgado, Abigail, additional, Corzo, Gerardo, additional, Lina-García, Laura Patricia, additional, Hernández-Velázquez, Víctor Manuel, additional, and Suárez-Rodríguez, Ramón, additional

Published
2019
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15. Morphological and molecular evidence for a new rhabdochonid species, Rhabdochona (Nematoda: Rhabdochonidae), parasitizing Eugerres mexicanus (Perciformes: Gerreidae), from the Lacantún River in the Biosphere Reserve of Montes Azules, Chiapas, Mexico.

Author

Manuel Caspeta-Mandujano, Juan, Cesar Salinas-Ocampo, Julio, Suárez-Rodríguez, Ramón, Martínez-Ramírez, Carlos, and Matamoros, Wilfredo A.

Subjects
BIOSPHERE reserves, PERCIFORMES, INCISORS, SPECIES, BAYESIAN analysis
Abstract

Copyright of Revista Mexicana de Biodiversidad is the property of Universidad Nacional Autonoma de Mexico, Instituto de Biologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2021
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16. Draft Genome Sequences of Endophytic Isolates of Klebsiella variicola and Klebsiella pneumoniae Obtained from the Same Sugarcane Plant

Author

Reyna-Flores, Fernando, primary, Barrios-Camacho, Humberto, additional, Dantán-González, Edgar, additional, Ramírez-Trujillo, José Augusto, additional, Lozano Aguirre Beltrán, Luis Fernando, additional, Rodríguez-Medina, Nadia, additional, Garza-Ramos, Ulises, additional, and Suárez-Rodríguez, Ramón, additional

Published
2018
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18. Estimación de parámetros genéticos y selección de líneas S1 en una población segregante de maíz tropical

Author

Rebolloza Hernández, Hermes, primary, Castillo Gutiérrez, Antonio, additional, Carapia Ruíz, Vicente Emilio, additional, Andrade Rodríguez, María, additional, Villegas Torres, Oscar Gabriel, additional, Núñez Valdés, María Eugenia, additional, Suárez Rodríguez, Ramón, additional, and Perdomo Roldán, Francisco, additional

Published
2017
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19. Variabilidad genética y asociación morfológica entre poblaciones nativas de maíz y sus cruzas F1

Author

Cervantes Adame, Yessica Flor, primary, Castillo Gutiérrez, Antonio, additional, Carapia Ruiz, Vicente Emilio, additional, Andrade Rodríguez, María, additional, Núñez Valdéz, María Eugenia, additional, Villegas Torres, Oscar Gabriel, additional, Perdomo Roldán, Francisco, additional, Suárez Rodríguez, Ramón, additional, and López Santillán, José Alberto, additional

Published
2017
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22. Oscheius myriophila(Nematoda: Rhabditida) isolated in sugar cane soils in Mexico with potential to be used as entomopathogenic nematode

Author

del Rocio Castro-Ortega, Iveth, Caspeta-Mandujano, Juan Manuel, Suárez-Rodríguez, Ramón, Peña-Chora, Guadalupe, Ramírez-Trujillo, José Augusto, Cruz-Pérez, Karina, Sosa, Iván Arenas, and Hernández-Velázquez, Víctor Manuel

Abstract

A survey of entomopathogenic nematodes was conducted in sugar cane crops in a total of 14 soils, and positive results were obtained for strain MC5-2014 in the municipality of Tepalcingo, Morelos, in soil with a sandy loam texture and a pH of 6.4. Species determination was performed via morphological and morphometric techniques by searching for a tubular stoma with a swollen cylindrical pharyngeal body and a metacorpus in the basal part. The range of body length (L) was 750 to 1200 μm in females and 720 to 910 μm in males, while the corresponding maximum widths (W) of the body were 30 to 60 μm and 20 to 30 μm, respectively. Males exhibited bursa with a 1 + 1 + 3 + 3 distribution of papillae, and females exhibited a vulva located at the mid-body. For molecular identification, the ITS region of ribosomal DNA was used. Virulence tests (LC50) were conducted with Galleria mellonella, and a value of 4.732 was obtained for infective juveniles (IJs). Taking taxonomic and molecular characteristics into account, the isolate was determined to be Oscheius myriophila. The isolation of this strain represents the first geographic report of O. myriophilain Mexico, and it should be noted that the cultivation of sugar cane occurs with constant application of insecticides, herbicides, fungicides, and fertilizers as well as harvesting activities such as burning of the crop for harvest. The O. myriophilaisolate has the potential to be used in the future as a method of biological control in our country.

Published
2020
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