Publicaciones

@article{nokey,

title = {Spatial structure of genetic and chemical variation in native populations of the mile-a-minute weed Mikania micrantha},

author = {Ángel Eliezer Bravo-Monzón and Antonio González-Rodríguez and Francisco Javier Espinosa-García},

doi = {10.1016/j.bse.2017.11.008},

issn = {03051978},

year  = {2018},

date = {2018-01-01},

journal = {Biochemical Systematics and Ecology},

volume = {76},

pages = {23-31},

publisher = {Elsevier Ltd},

abstract = {We examined the spatial distribution and potential relationship of genetic and volatile terpenoid diversity in 13 Mexican populations of Mikania micrantha (Asteraceae) from the Atlantic and Pacific watersheds using six specific microsatellites. A low genetic diversity was observed in all populations (HE = 0.00–0.37), which may be attributed to clonal reproduction and/or their marginal location relative to the whole species distribution in the Americas. We found a significant genetic differentiation between regions, and more genetic structure in Atlantic populations where a Mantel test also showed a pattern of isolation by distance (r2 = 0.478},

keywords = {Asteraceae, DNA, Invasive species biocontrol, Microsatellites, Population genetics, Terpenoids},

pubstate = {published},

tppubtype = {article}

}

@article{Ramirez-Barahona2017,

title = {The influence of climatic niche preferences on the population genetic structure of a mistletoe species complex},

author = {Santiago Ramírez-Barahona and Clementina González and Antonio González-Rodríguez and Juan Francisco Ornelas},

doi = {10.1111/nph.14471},

issn = {14698137},

year  = {2017},

date = {2017-01-01},

journal = {New Phytologist},

volume = {214},

issue = {4},

pages = {1751-1761},

abstract = {The prevalent view on genetic structuring in parasitic plants is that host-race formation is caused by varying degrees of host specificity. However, the relative importance of ecological niche divergence and host specificity to population differentiation remains poorly understood. We evaluated the factors associated with population differentiation in mistletoes of the Psittacanthus schiedeanus complex (Loranthaceae) in Mexico. We used genetic data from chloroplast sequences and nuclear microsatellites to study population genetic structure and tested its association with host preferences and climatic niche variables. Pairwise genetic differentiation was associated with environmental and host preferences, independent of geography. However, environmental predictors appeared to be more important than host preferences to explain genetic structure, supporting the hypothesis that the occurrence of the parasite is largely determined by its own climatic niche and, to a lesser degree, by host specificity. Genetic structure is significant within this mistletoe species complex, but the processes associated with this structure appear to be more complex than previously thought. Although host specificity was not supported as the major determinant of population differentiation, we consider this to be part of a more comprehensive ecological model of mistletoe host-race formation that incorporates the effects of climatic niche evolution.},

keywords = {ecological niche, host-race formation, landscape genetics, Microsatellites, parasites},

pubstate = {published},

tppubtype = {article}

}

@article{Perez-Lopez2016,

title = {Effects of plant hybridization on the structure and composition of a highly rich community of cynipid gall wasps: the case of the oak hybrid complex Quercus magnoliifolia x Quercus resinosa in Mexico},

author = {Griselda Pérez-López and Antonio González-Rodríguez and Ken Oyama and Pablo Cuevas-Reyes},

doi = {10.1007/s10531-016-1074-1},

issn = {15729710},

year  = {2016},

date = {2016-01-01},

journal = {Biodiversity and Conservation},

volume = {25},

issue = {4},

pages = {633-651},

abstract = {The richness and composition of herbivore communities can be influenced by the genetic variation of host plants. Hybrid plant populations are ideal to test these effects because they usually harbor high genetic variation and display a mosaic of phenotypic characters. The goal of this study was to examine the effect of hybridization between two Mexican white oaks, Q. magnoliifolia and Q. resinosa, on the composition and diversity of the associated cynipid gall wasp community. We used eight nuclear microsatellite markers to genotype 150 oak individuals sampled at three different altitudes at the Tequila volcano and conducted monthly samplings of galls in each individual over the course of 2 years. A Bayesian assignment analysis indicated genetic admixture between the two oak species at the study site and allowed classifying individuals as Q. magnoliifolia, Q. resinosa or hybrids. Gall morphospecies richness was significantly higher in the hybrids, intermediate in Q. magnoliifolia and lower in Q. resinosa. Overall, 48 different gall morphospecies were found, with 21 of them being shared among the three groups of plants, 13 between two groups of plants, and 14 were unique to one group of plants, with eight of these being found in hybrids. Several of the shared galls showed differences in abundance among plant groups. Therefore, genetic structure in this oak complex significantly influences the diversity and composition of the associated gall wasp community, and hybrid individuals are probably acting as potential sinks and bridges for the colonization of plant hosts by these highly specialized insect species.},

keywords = {Bayesian assignment, Cynipids, Fagaceae, Hybrid sink hypothesis, Microsatellites},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Geographic structure of genetic and phenotypic variation in the hybrid zone between Quercus affinis and Q. laurina in Mexico},

author = {S. Ramos-Ortiz and K. Oyama and H. Rodríguez-Correa and A. González-Rodríguez},

doi = {10.1111/1442-1984.12109},

issn = {14421984},

year  = {2016},

date = {2016-01-01},

journal = {Plant Species Biology},

volume = {31},

issue = {3},

pages = {219-232},

publisher = {Blackwell Publishing},

abstract = {Analyzing the structure of hybrid zones is important for inferring their origin, dynamics and evolutionary significance. We examined the geographic structure of phenotypic and genetic variation in the contact zone between two Mexican red oaks, Quercus affinis and Q. laurina. A total of 105 individuals from seven populations were sampled along a 600-km latitudinal gradient representing the distribution area of the two species and their contact zone. Individuals were genotyped for nine nuclear and four chloroplast DNA microsatellite loci (ncSSR and cpSSR, respectively), and characterized for several leaf and acorn traits. The cpSSR data revealed extensive haplotype sharing among populations of the two species, while a Bayesian assignment analysis based on ncSSRs identified two main genetic groups, each corresponding to one of the species, and two populations in the contact zone showing evidence of admixture. The proportion of genetic ancestry in the populations was strongly associated with latitude and showed a pattern of variation with the shape of a narrow sigmoidal cline. The variation in three of the seven phenotypic traits was partially congruent with molecular variation, while the other traits did not conform to a geographic cline but instead were correlated with environmental variables. In conclusion, the hybrid zone between the two oak species has some of the characteristics of a tension zone, but heterogeneous variation across traits suggests differential introgression and the action of extrinsic selection.},

keywords = {cline, hybrid zone, introgression, Microsatellites, morphologic variation, Quercus},

pubstate = {published},

tppubtype = {article}

}

@article{Letelier2015,

title = {Isolation and Characterization of 12 Microsatellite Loci in Soapbark, Quillaja saponaria (Quillajaceae)},

author = {Luis Letelier and Nick Harvey and Aly Valderrama and Alexandra Stoll and Antonio González-Rodríguez},

doi = {10.3732/apps.1500024},

issn = {1537-2197},

year  = {2015},

date = {2015-01-01},

journal = {Applications in Plant Sciences},

volume = {3},

issue = {5},

pages = {1500024},

abstract = {Premise of the study: Microsatellite primers were developed for the 

endemic Chilean tree Quillaja saponaria (Quillajaceae), a common member 

of the sclerophyllous Mediterranean forest, to investigate intraspecific 

patterns of genetic diversity and structure. 

Methods and Results: Using an enriched library, 12 polymorphic 

microsatellite loci were developed in Q. saponaria. All loci consisted 

of dinucleotide repeats. The average number of alleles per locus was 5.3 

(2-13), with a total of 64 alleles recorded in 39 individuals from three 

populations. 

Conclusions: The microsatellite markers described here are the first 

characterized for Q. saponaria. The polymorphic loci will be useful in 

studies of genetic diversity and genetic population differentiation in 

natural populations of this species.},

keywords = {chile, Microsatellites, quillaja saponaria, quillajaceae, soapbark},

pubstate = {published},

tppubtype = {article}

}

@article{Maldonado-Lopez2014,

title = {Relationships among plant genetics, phytochemistry and herbivory patterns in Quercus castanea across a fragmented landscape},

author = {Yurixhi Maldonado-López and Pablo Cuevas-Reyes and Antonio González-Rodríguez and Griselda Pérez-López and Carlos Acosta-Gómez and Ken Oyama},

doi = {10.1007/s11284-014-1218-2},

issn = {14401703},

year  = {2014},

date = {2014-01-01},

journal = {Ecological Research},

volume = {30},

issue = {1},

pages = {133-143},

abstract = {Herbivorous insects respond to the chemical variation of their host plants which, in turn, usually has a genetic component. Therefore, it is expected that individual host plants with similar genotypes will have similar secondary chemistries and herbivore communities. However, natural or anthropogenic environmental variation can also influence secondary chemistry and herbivore abundance and composition. Here, we determined the relationships among plant genetics, phytochemistry, and herbivory levels by leaf chewers and miners in the red oak Quercus castanea, across a fragmented landscape. Ten oak individuals were sampled at each of four sites in the Cuitzeo basin, central Mexico. Two sites were small and fragmented forest patches and two were large and continuous patches. Individuals were genotyped with six nuclear microsatellites, and analyzed chemically to determine foliar concentrations of water, total nonstructural carbohydrates, and secondary compounds. Damage by leaf chewers was higher in the small fragments than in the large fragments. Mantel tests indicated significant correlations of the genetic distance among individuals with their chemical similitude, and also of chemical similitude with damage levels by leaf miners, but not with damage by folivores. There was no direct relationship between genetic distance and herbivory levels by any of the two insect guilds. Our results suggest that variation in concentration of secondary metabolites in Q. castanea has a genetic component and that plant chemistry acts as an intermediate link between plant genes and the community of associated herbivores. However, this effect was only apparent for herbivory by leaf miners, probably because these insects interact more intimately with the host, while free-living leaf chewers may be more responsive to environmental variation.},

keywords = {Folivores, Leaf miners, Mexico, Microsatellites, Oak},

pubstate = {published},

tppubtype = {article}

}

@article{Herrera-Arroyo2013,

title = {Seed-mediated connectivity among fragmented populations of Quercus castanea (Fagaceae) in a Mexican landscape},

author = {M. Luisa Herrera-Arroyo and Victoria L. Sork and Antonio González-Rodríguez and Víctor Rocha-Ramírez and Ernesto Vega and Ken Oyama},

doi = {10.3732/ajb.1200396},

issn = {00029122},

year  = {2013},

date = {2013-01-01},

journal = {American Journal of Botany},

volume = {100},

issue = {8},

pages = {1663-1671},

abstract = {Premise of study: Anthropogenic fragmentation is an ongoing process in many forested areas that may create loss of connectivity among tree populations and constitutes a serious threat to ecological and genetic processes. We tested the central hypothesis that seed dispersal mitigates the impact of fragmentation by comparing connectivity and genetic diversity of adult vs. seedling populations in recently fragmented populations of the Mexican red oak Quercus castanea. Methods: Adult individuals, established before fragmentation, and seedlings, established after fragmentation, were sampled at 33 forest fragments of variable size (0.2 to 294 ha) within the Cuitzeo basin, Michoacán state, and genotyped using seven highly polymorphic chloroplast microsatellite markers (cpSSRs). To test whether seed dispersal retains connectivity among fragmented populations, we compared genetic diversity and connectivity networks between adults and progeny and determined the effect of fragment size on these values. • Key results: Seventy haplotypes were identified, 63 in the adults and 60 in the seedlings, with average within-population diversity (h S) values of 0.624 in the adults and 0.630 in the seedlings. A positive correlation of genetic diversity values with fragment size was found in the seedling populations but not in the adult populations. The network connectivity analysis revealed lower connectivity among seedling populations than among adults. The number of connections (edges) as well as other network properties, such as betweenness centrality, node degree and closeness, were significantly lower in the seedlings network. • Conclusions: Habitat fragmentation in this landscape is disrupting seed-dispersal-mediated genetic connectivity among extant populations. © 2013 Botanical Society of America.},

keywords = {Chloroplast dna, Fagaceae, Forest fragmentation, genetic connectivity, genetic variation, Microsatellites, Quercus castanea},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Round and large: Morphological and genetic consequences of artificial selection on the gourd tree Crescentia cujete by the Maya of the Yucatan Peninsula, Mexico},

author = {Xitlali Aguirre-Dugua and Luis E. Eguiarte and Antonio González-Rodrgíuez and Alejandro Casas},

doi = {10.1093/aob/mcs068},

issn = {03057364},

year  = {2012},

date = {2012-01-01},

journal = {Annals of Botany},

volume = {109},

issue = {7},

pages = {1297-1306},

abstract = {Background and AimsArtificial selection, the main driving force of domestication, depends on human perception of intraspecific variation and operates through management practices that drive morphological and genetic divergences with respect to wild populations. This study analysed the recognition of varieties of Crescentia cujete by Maya people in relation to preferred plant characters and documents ongoing processes of artificial selection influencing differential chloroplast DNA haplotype distribution in sympatric wild and home-garden populations. MethodsFifty-three home gardens in seven villages (93 trees) and two putative wild populations (43 trees) were sampled. Through semi-structured interviews we documented the nomenclature of varieties, their distinctive characters, provenance, frequency and management. Phenotypic divergence of fruits was assessed with morphometric analyses. Genetic analyses were performed through five cpDNA microsatellites. Key ResultsThe Maya recognize two generic (wild/domesticated) and two specific domesticated (white/green) varieties of Crescentia cujete. In home gardens, most trees (68%) were from domesticated varieties while some wild individuals (32%) were tolerated. Cultivation involves mainly vegetative propagation (76%). Domesticated fruits were significantly rounder, larger and with thicker pericarp than wild fruits. Haplotype A was dominant in home gardens (76%) but absent in wild populations. Haplotypes B-F were found common in the wild but at low frequency (24%) in home gardens. ConclusionsThe gourd tree is managed through clonal and sexual propagules, fruit form and size being the main targets of artificial selection. Domesticated varieties belong to a lineage preserved by vegetative propagation but propagation by seeds and tolerance of spontaneous trees favour gene flow from wild populations. Five mutational steps between haplotypes A and D suggest that domesticated germplasm has been introduced to the region. The close relationship between Maya nomenclature and artificial selection has maintained the morphological and haplotypic identity (probably for centuries) of domesticated Crescentia despite gene flow from wild populations. © The Author 2012. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.},

keywords = {Artificial selection, Bignoniaceae, Crescentia cujete, domestication, Maya, Mesoamerica, Microsatellites, traditional plant management},

pubstate = {published},

tppubtype = {article}

}