Dr. Esperanza Martinez-Romero
Centro de Ciencias Genómicas, UNAM, Cuernavaca, Morelos, Mexico
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Academic Career Length
39Years (1988-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 August 2006 in Molecular Plant-Microbe Interactions®
Journal Article
MRMónica Rosenblueth
Mónica Rosenblueth
Esperanza Martinez-RomeroRecent molecular studies on endophytic bacterial diversity have revealed a large richness of species. Endophytes promote plant growth and yield, suppress pathogens, may help to remove contaminants, solubilize phosphate, or contribute assimilable nitrogen to plants. Some endophytes are seed-borne, but others have mechanisms to colonize the plants that are being studied. Bacterial mutants unable to produce secreted proteins are impaired in the colonization process. Plant genes expressed in the presence of endophytes provide clues as to the effects of endophytes in plants. Molecular analysis showed that plant defense responses limit bacterial populations inside plants. Some human pathogens, such as Salmonella spp., have been found as endophytes, and these bacteria are not removed by disinfection procedures that eliminate superficially occurring bacteria. Delivery of endo-phytes to the environment or agricultural fields should be carefully evaluated to avoid introducing pathogens.
1 December 2011 in Annual Review of Ecology, Evolution, and Systematics
Journal Article
MFMaren L. Friesen
Maren L. FriesenSPStephanie S. Porter
Stephanie S. Porter
SSScott C. Stark
Scott C. Stark
Eric von WettbergJSJoel L. Sachs
Joel L. Sachs
Esperanza Martinez-RomeroPlants are rife with bacteria and fungi that colonize roots and shoots both externally and internally. By providing novel nutritional and defense pathways and influencing plant biochemical pathways, microbes can fundamentally alter plant phenotypes. Here we review the widespread nature of microbially mediated plant functional traits. We highlight that there is likely fitness conflict between hosts and symbionts and that fitness outcomes can depend on partner genotypes and ecological factors. Microbes may influence ecosystems through their effects on the functional trait values and population dynamics of their plant hosts. These effects may feed back on symbiont evolution by altering transmission rates of symbionts and scale up to ecosystem processes and services. We end by proposing new avenues of research in this emerging field.
1 January 2001 in International Journal of Systematic and Evolutionary Microbiology
Journal Article
JYJ M Young
J M Young
LKL D Kuykendall
L D Kuykendall
Esperanza Martinez-RomeroAKA Kerr
A Kerr
HSH Sawada
H SawadaRhizobium, Agrobacterium and Allorhizobium are genera within the bacterial family Rhizobiaceae, together with Sinorhizobium. The species of Agrobacterium, Agrobacterium tumefaciens (syn. Agrobacterium radiobacter), Agrobacterium rhizogenes, Agrobacterium rubi and Agrobacterium vitis, together with Allorhizobium undicola, form a monophyletic group with all Rhizobium species, based on comparative 16S rDNA analyses. Agrobacterium is an artificial genus comprising plant-pathogenic species. The monophyletic nature of Agrobacterium, Allorhizobium and Rhizobium and their common phenotypic generic circumscription support their amalgamation into a single genus, Rhizobium. Agrobacterium tumefaciens was conserved as the type species of Agrobacterium, but the epithet radiobacter would take precedence as Rhizobium radiobacter in the revised genus. The proposed new combinations are Rhizobium radiobacter, Rhizobium rhizogenes, Rhizobium rubi, Rhizobium undicola and Rhizobium vitis.
1 July 1991 in International Journal of Systematic and Evolutionary Microbiology
Journal Article
Esperanza Martinez-RomeroLSLorenzo Segovia
Lorenzo SegoviaFMFabio Martins Mercante
Fabio Martins Mercante
AFAvílio Antonio Franco
Avílio Antonio Franco
PGPeter Graham
Peter Graham
MPMarco Aurelio Pardo
Marco Aurelio Pardo
A new Rhizobium species that nodulates Phaseolus vulgaris L. and Leucaena spp. is proposed on the basis of the results of multilocus enzyme electrophoresis, DNA-DNA hybridization, an analysis of ribosomal DNA organization, a sequence analysis of 16S rDNA, and an analysis of phenotypic characteristics. This taxon, Rhizobium tropici sp. nov., was previously named Rhizobium leguminosarum biovar phaseoli (type II strains) and was recognized by its host range (which includes Leucaena spp.) and nif gene organization. In contrast to R. leguminosarum biovar phaseoli, R. tropici strains tolerate high temperatures and high levels of acidity in culture and are symbiotically more stable. We identified two subgroups within R. tropici and describe them in this paper.
1 January 2005 in Molecular Phylogenetics and Evolution
Journal Article
PVPablo Vinuesa
Pablo VinuesaCSClaudia Silva
Claudia Silva
DWDietrich Werner
Dietrich Werner
Esperanza Martinez-Romero1 April 1993 in International Journal of Systematic and Evolutionary Microbiology
Journal Article
LSLorenzo Segovia
Lorenzo Segovia
J. Peter W. YoungEsperanza Martinez-RomeroA new Rhizobium species that nodulates Phaseolus vulgaris L. is proposed on the basis of a sequence analysis of 16S ribosomal DNA. This taxon, Rhizobium etli sp. nov., was previously named Rhizobium leguminosarum biovar phaseoli (type I strains) and is characterized by the capacity to establish an effective symbiosis with bean plants, the reiteration of the nitrogenase structural genes, the organization of the common nodulation genes into two separate transcriptional units bearing nodA and nodBC, the presence of the polysaccharide inhibition gene, psi, and the 16S ribosomal DNA sequence. An analysis of the sequence of a fragment of the 16S rRNA gene shows that this gene is quite different from the gene of R. leguminosarum. In addition, all R. etli strains have identical sequences. We describe these analyses and discuss additional evidence supporting our proposal.
About Me
Esperanza Martínez-Romero is a Senior Researcher at the Center for Genomic
Sciences, National Autonomous University of Mexico (UNAM). She earned
her Bachelor’s, Master’s, and PhD degrees in Biomedical Research from
UNAM. She is a member of the American
Academy of Microbiology and the National System of Researchers. She
chaired the International Committee on Rhizobium Taxonomy and served on
the Steering Committee of the International Society for Microbial
Ecology (ISME). She was the Editor of Applied and Environmental Microbiology
and continues to serve on several editorial boards. Her research
interests span microbiology, symbiosis, bacterial diversity, molecular
genetics, and genomics, with an emphasis on practical applications. Her
honors include the National University Award for Young Academics, the
Natural Sciences Award from the Mexican Academy of Sciences, the
National University Award in Natural Sciences, the Agrobio Award, the
Juana Ramírez de Asbaje Recognition from UNAM, the L’Oréal-UNESCO Award,
and the National Science Award of Mexico.