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Initial floristic composition of rehabilitated gullies through bioengineering in the Mixteca Region, Sierra Madre del Sur, Mexico

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Journal of Mountain Science 2018年第10期15卷 2120-2135页

作者： Verónica Guadalupe LIRA-CABALLERO Mario Roberto MARTíNEZ-MENEZ Angélica ROMERO-MANZANARES Edmundo GARCíA-MOYA department of Hydrosciences Colegio de Postgraduados department of Botany Colegio de Postgraduados

Re-vegetation plays a fundamental role for erosion control and plant recovery in lands affected by gully erosion. Bioengineered practices facilitate the gullies rehabilitation. Objectives of the research were: 1) Identify taxonomically the pioneer vegetation on each gully section; 2) Characterize vegetation distribution preferences and 3) Assess structural/functional traits to recognize erosion control key species. Bioengineering was applied in a watershed belonging to Sierra Madre del Sur, at Oaxaca, Mexico, on eight gullies, with local support and minimal investment. "La Mixteca" is a poor ecological and socio-economic region, comparable to other regions of the world. The Initial Floristic Composition(IFC) inventory is the baseline of the successional process. The transect method was used to determine the colonization of species. Cover abundance of registered species was estimated using the semi-quantitative scale of Braun-Blanquet. This procedure was repeated in five different positions(floor, hillslopes and tops), in the cross section of the gully. Throughcorrespondence analysis and clustering, the distribution of species was analyzed. Adequate responses were obtained in soil retention(quantity) and plant cover(existence and diversity); as measurable indicators of the bioengeneering works efficiency. Occupation of soil by native species from the Tropical deciduous Forest was favored using live barriers. We detected species guilds with spatial distribution preferences in the gullies cross section. Plant cover characterization includes: native colonizer species, herbaceous, shrubby and trees of the forest community bordering the gully area, with cover abundance and structural/functional traits, useful to protect degraded areas. This spatial occupation process of plants responds to a secondary succession in gullies, where the proposed IFC model is correctly represented through bioengineering. Natural establishment of plants was successful by traits of species such

关键词： Semi-arid environment Mexico Gully erosion Plant colonization Multivariate analysis Braun-Blanquet method

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Tolerance of Chrysantemum maximum to heavy metals:The potential for its use in the revegetation of tailings heaps

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Journal of Environmental Sciences 2013年第2期25卷 367-375页

作者： Ma.del Carmen A.Gonzlez-Chvez Rogelio Carrillo-Gonzlez colegio de postgraduados Programa de EdafologíaCarr.Mxico-Texcocokm 36.5MontecilloTexcoco estado de Mxico 56230Mxico

To find if ornamental plants are applicable to the remediation of metal-polluted areas, the tolerance of chrysanthemum plants （Chysanthemum maximum） var. Shasta to different metals under hydroponic conditions was studied. Their responses as influenced by the mycorrhizal fungus Glomus mosseae （Nicol. ＆ Gerd.） Gerdemann ＆ Trappe BEG25 on substrates containing mine residues were also investigated. Our results showed that chrysanthemum is a metal-tolerant plant under hydroponic conditions, plants behaving as Pb-excluders, whereas Cd, Cu and Ni were accumulated in roots. Low accumulation in flowers was observed for Cd and Cu but it was concentration-dependent. Ni and Pb were not translocated to flowers. Shoot biomass was not significantly affected by the different rates of mine residue addition for both mycorrhizal and non-mycorrhizal plants. Mycorrhizal plants accumulated less Pb and Cu in both shoots and roots than non-mycorrhizal plants. Chysanthemum could be a prospective plant for revegetation of tailings and the use of inoculation may decrease plant metal accumulation in polluted soils.

关键词： mine residues ornamental plants phytostabilization urban remediation

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Camera traps reveal the natural corridors used by mammalian species in eastern Mexico

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Ecological Processes 2022年第1期11卷 711-722页

作者： Jonathan O.Huerta‑Rodríguez Octavio C.Rosas‑Rosas Lauro López‑Mata JoséL.Alcántara‑Carbajal Luis A.Tarango‑Arámbula Programa de Recursos Genéticos y Productividad‑Ganadería Colegio de Post‑graduadosCampus MontecilloTexcocoMexico Programa de Innovación en Manejo de Recursos Naturales Colegio de PostgraduadosCampus San Luis PotosíSan Luis PotosíMexico Programa de Dinámica y Conservación de Bosques y Selvas Macroecología y BiodiversidadColegio de PostgraduadosCampus MontecilloTexcocoMexico

Background:Habitat loss and fragmentation in the Sierra Madre Oriental(SMO)ecological corridor have negative impacts on the movement and distribution of mammalian species that are of great ecological and evolutionary *** of the SMO ecological corridor that is located in the state of Hidalgo is less studied despite being a potential dispersal route for *** objectives of this study were to evaluate the presence and activity of terrestrial mammals in the riparian and non‑riparian zones of ***:Camera traps detected 15 mammalian species(i.e.,14 native and 1 domestic)in the non‑riparian zone,and 12 mammalian species in the riparian zone(i.e.,10 wild and 2 domestic).The riparian corridor was mainly used by opportunistic medium‑sized carnivores,while large carnivores and their potential prey were more frequent in the non‑riparian ***:Our findings suggest terrestrial mammals avoid the use of natural corridors due to the presence of domestic dogs,cattle and humans and look for new dispersal routes to move through their habitat and find the resources they need to *** though some species can use disturbed corridors to move and find resources,they will change their activity patterns to avoid contact with humans and potential threats like *** is,therefore,crucial to identify not one,but several corridors that must be preserved to improve the connectivity of terrestrial mammals in disturbed landscapes.

关键词： Activity Jaguar Cattle detectability Dog Herbivore Disturbance Prey Relative abundance

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Ecological distribution and population structure of Litsea glaucescens(Lauraceae)in the ravines of Sierra Fría and Sierra Laurel,Central Mexico

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Journal of Mountain Science 2022年第7期19卷 1945-1960页

作者： Mara Irais FLORES-GALLEGOS Edmundo GARCIA-MOYA Angelica ROMERO-MANZANARES Mario LUNA-CAVAZOS Martin Alfonso MENDOZA-BRISENO Heike VIBRANS Posgrado en Botánica Colegio de PostgraduadosCampus Montecillo.Km 36.5carretera México-TexcocoMontecilloTexcocoEdo.de México56230México colegio de postgraduados Campus Veracruz.Carretera Jalapa Veracruz Km 88.5Altamirano91690VeracruzMéxico

Litsea glaucescens Kunth(Mexican bay leaf,laurel)has a wide distribution in Mexico,growing at both riparian and rupicolous environments in the mountainous region of the Central Highlands of the *** Fría-Sierra Laurel is a protected natural area covered by a dry *** Mexican bay leaf is associated with the oak forest,especially on *** species has been considered at risk in recent *** research is focused on analyzing the elements of the environment of the ravines,which are influencing the distribution and establishment of laurel populations in the *** mountainous regions of Aguascalientes were selected,Sierra Fría and Sierra *** ravines of the basin were selected to obtain environmental *** registered were topographic,edaphic,and *** component analysis was used to identify ecological factors associated with the presence of *** bay leaf populations were registered in 10 *** the structural level in the community,29 woody species were registered,Mexican bay leaf had an Importance Value Index of 15.8,ranking 10th among all *** of laurel were classified by size classes(S,individuals with heights ranging from 0 to 20 cm;S,heights ranging from 0.2 to 1.0 m;S,heights between 1 and 2 m with light trace of flowering;S,heights greater than 2 m with flowering greater than 30% of the canopy;and S,individuals with heights greater than 5 m,curved trunk and basal regrowth)to obtain the population *** importance index value for all the species in the riparian community was calculated to the community *** factors that characterized the presence of Mexican bay leaf were a high percentage of rock coverage(90%),less mulch depth,and sandy loam shallow *** that showed higher cation exchange capacity had a higher presence of individuals of the S,S,and Ssize *** Sindividuals were found in shady places with 97% of intercepted *** o

关键词： Dry Forest Ephemeral stream Importance Value Index Mexican bay leaf Population structure Principal Component Analysis

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Suppression Effects on Pineapple Soil-Borne Pathogens by Crotalaria juncea,Dolomitic Lime and Plastic Mulch Cover on MD-2 Hybrid Cultivar

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Phyton-International Journal of Experimental Botany 2021年第4期90卷 1205-1216页

作者： Luis Alfonso Aguilar Pérez Daniel NietoÁngel Moisés Roberto Vallejo Pérez Daniel Leobardo Ochoa Martínez David Espinosa Victoria Andrés Rebolledo Martinez Abel Rebouças São José Fitopatología Colegio de PostgraduadosMontecillo-Texcoco56230México conacyt-Universidad Autónoma de San Luis Potosí CIACYTSan Luis Potosí78000México Edafología Colegio de PostgraduadosMontecillo-Texcoco56230México Instituto Nacional de Investigaciones Forestales Agrícolas y PecuariasVeracruz94270México Rebouças São José A.UESB/DFZVitória da Conquista95Brasil

The development and implementation of sustainable and environmentally friendly agricultural practices are indispensable as alternatives to pesticide use and to keep populations of soil-borne plant pathogens at levels that do not affect crop *** present research evaluates the incidence of soil-borne phytopathogens on the pineapple variety MD-2,which was subjected to different treatments:Incorporation of Crotalaria juncea into the soil(organic amendment),application of dolomitic lime to soil(inorganic amendment),and the use of plastic mulch covering the *** the crop cycle(15 months),the following variables were evaluated:plant height(cm),fruit weight(kg·plant^(−1)),crop yield(ton·ha^(−1)),the bud root disease incidence caused by Phytophthora nicotianae,number of soil phytoparasitic nematodes and colony-forming-units(CFUs)of soil fungi and *** results indicate that Crotalaria juncea treatment reduced the pathogen population(nematode and oomycetes)at levels that did not affect crop development,so that yield increased(18–20%).The incorporation of *** into the soil as an organic amendment favors the populations of fungi disease suppressors(Trichoderma-Aspergillus).The phytoparasitic nematodes(Meloidogyne sp.,Pratylenchus sp.,and Mesocriconema sp.)and oomycetes(Phytophthora spp.,and Pythium spp.)showed a reduction of their population levels by effects of organic amendment(***).The plastic mulch was also effective,probably due to the maintenance of optimal condition to crop growth and weed ***,the dolomitic lime application had the poorest effect under the conditions of the study area on the variables *** described observations are characteristics of a system-based approach for the potential management of soil-borne pathogens of pineapple MD-2 in Veracruz,México.

关键词： Suppressive soil integrated pest management Phytophthora nicotiannae Phytoparasitic nematodes

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Selection and Analysis of Polymorphisms in Somaclonal Variants of Agave americana Resistant to Fusarium oxysporum via an Ethyl Methanesulphonate Treatment

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Phyton-International Journal of Experimental Botany 2021年第6期90卷 1727-1739页

作者： Sheila Jazmín Reyes-Zambrano Carlos Alberto Lecona-Guzmán Federico Antonio Gutiérrez-Miceli Víctor Manuel Ruiz-Valdiviezo Arely Anayansi Vargas-Díaz Laboratorio de Biotecnología Vegetal Instituto Tecnológico de Tuxtla GutiérrezTecnológico Nacional de MéxicoTuxtla GutiérrezChiapas29050México conacyt-colegio de postgraduados Campus Campeche ChampotónCampeche24450México

Agave americana *** were exposed to different concentrations of ethyl methanesulphonate(EMS)0,15,30,45 and 60 mM and to different times of exposure(2 and 4 h).The viability and capacity of shoot formation were shown to be affected when the callus were exposed to high concentrations(30–60 mM).Only the callus exposed to 15 mM EMS presented shoot formation;the exposure time of two hours produced the largest quantity of shoots regenerated per callus(21 shoots/callus).In order to generate somaclonal variants resistant to Fusarium oxysporum,a selection pressure was applied through of a culture filtrate(CF)of 100 ppm of the *** was made in callus obtained in the treatment with 15 mM EMS during 2 h of *** CF caused oxidation and necrosis in 71.25%of the callus;however,they were capable of generating shoots(3.5 shoots/callus).Molecular markers type RAPD,ISSR and DAMD were used to evaluate the genetic variation arising from the mutations caused by EMS on control plants and 16-month-old somaclonal *** polymorphic information content(PIC)for each one of the initiating groups was:0.28(DAMD),0.09(ISSR)and 0.14(RAPD).DAMD revealed a greater percentage of polymorphism than RAPD and *** bands were detected in the somaclonal *** indicated that the EMS caused genetic variation in the regenerated plants conferring resistance to them against Fusarium oxysporum.

关键词： Mutagenesis polymorphisms genetic variation molecular markers

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Plant Proteins Are Smaller Because They Are Encoded by Fewer Exons than Animal Proteins

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Genomics, Proteomics & Bioinformatics 2016年第6期14卷 357-370页

作者： Obed Ramirez-Sachez Paulino Perez-Rodriguez Luis delaye Axel Tiessen Genetic Engineering department CINVESTAV Unidad IrapuatoIrapuatoCP 36821Mexico colegio de postgraduados Campus MontecilloTexcocoCP 56230Mexico

Protein size is an important biochemical feature since longer proteins can harbor more domains and therefore can display more biological functionalities than shorter proteins. We found remarkable differences in protein length, exon structure, and domain count among different phylo- genetic lineages. While eukaryotic proteins have an average size of 472 amino acid residues （aa）, average protein sizes in plant genomes are smaller than those of animals and fungi. Proteins unique to plants are -81 aa shorter than plant proteins conserved among other eukaryotic lineages. The smaller average size of plant proteins could neither be explained by endosymbiosis nor subcellular compartmentation nor exon size, but rather due to exon number. Metazoan proteins are encoded on average by -10 exons of small size [-176 nucleotides （nt）]. Streptophyta have on average only -5.7 exons of medium size （-230 nt）. Multicellular species code for large proteins by increasing the exon number, while most unicellular organisms employ rather larger exons （〉 400 nt）. Among subcellular compartments, membrane proteins are the largest （-520 aa）, whereas the smallest proteins correspond to the gene ontology group of ribosome （-240 aa）. Plant genes are encoded by half the number of exons and also contain fewer domains than animal proteins on average. Interestingly, endosymbiotic proteins that migrated to the plant nucleus became larger than their cyanobacterial orthologs. We thus conclude that plants have proteins larger than bacteria but smaller than animals or fungi. Compared to the average of eukaryotic species, plants have -34% more but -20% smaller proteins. This suggests that photosynthetic organisms are unique and deserve therefore special attention with regard to the evolutionary forces acting on their genomes and proteomes.

关键词： Digital proteome Eukarya Evolution Viridiplantae Polypeptide length

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Species diversity of thrips (Thysanoptera) in selected avocado orchards from Mexico based on morphology and molecular data

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Journal of Integrative Agriculture 2018年第11期17卷 2509-2517页

作者： Daniel Bravo-Perez Ma. Teresa Santillbn-Galicia Roberto M. Johansen-Naime Hector Gonzalez-Hernandez Obdulia L. Segura-Leon Daniel L, Ochoa-Martinez Stephanie Guzman-Valencia Posgrado en Fitosanidad-Entomologia y Acarologia Colegio de Postgraduados Km 36.5 Carretera Mexico-Texcoco Montecillo Texcoco Estado de Mexico 56230 Mexico Instituto de Biologia de la Universidad Nacional Autonoma de Mexico (IBUNAM) Circuito exterior s/n Ciudad Universitaria Coyoacan Ciudad de Mexico 04510 Mexico Posgrado en Fitosanidad-Fitopatologia Colegio de Postgraduados Km 36.5 Carretera Mexico-Texcoco Montecillo Texcoco Estado de Mexico 56230 Mexico

Avocado is one of the most important crops in the world, and Mexico is the largest producer of this fruit. Several insect pests affect its production, and thrips are amongst the most important. A key step in the design of control methods is accurate species identification. despite this, formal reports on species diversity of thrips in Mexico are very scarce. Morphological identification can sometimes be time-consuming and inconclusive. Therefore, we explored the species diversity of thrips in Mexican avocado orchards （Michoacan state） based on partial sequences of the mitochondrial gene cytochrome oxidase subunit I （COl）. Forty-four specimens were analysed, which represented approximately 8% of all individuals collected from five localities distributed in three Municipalities. All specimens were analysed using the COl marker, and specimens within the genera Frankliniella were also analysed using a marker within the D2 domain of the 28S （28SD2） nuclear ribosomal DNA. Molecular identifications were confirmed using morphological taxonomy. Overall, six genera were found （Neohydatothrips, Scirtothrips, Frankliniella, Arorathrips, Caliothrips and Leptothrips）. AII genera contained only one species, except Frankliniella, for which there were six species. Data from the two molecular markers suggest the existence of cryptic species within Mexican F. occidentalis populations.

关键词： molecular taxonomy morphological identification cytochrome oxidase subunit I 28S nuclear ribosomal DNA.

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Influence of climatic conditions,topography and soil attributes on the spatial distribution of site productivity index of the species rich forests of Jalisco,Mexico

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Journal of Forestry Research 2014年第1期25卷 87-95页

作者： Adel Mohamed Robin M.Reich Raj Khosla C.Aguirre-Bravo Martin Mendoza Briseo department of Ecology and Rangeland Stewardship Desert Research Center department of Forest and Rangeland Stewardship Colorado State University department of Soil and Crop Sciences Colorado State University USDA Forest Service colegio de postgraduados

This paper presents an approach based on field data to model the spatial distribution of the site productivity index （SPI） of the diverse forest types in Jalisco, Mexico and the response in SPI to site and cli-matic conditions. A linear regression model was constructed to test the hypothesis that site and climate variables can be used to predict the SPI of the major forest types in Jalisco. SPI varied significantly with topog-raphy （elevation, aspect and slope）, soil attributes （pH, sand and silt）, climate （temperature and precipitation zones） and forest type. The most important variable in the model was forest type, which accounted for 35% of the variability in SPI. Temperature and precipitation accounted for 8 to 9% of the variability in SPI while the soil attributes accounted for less than 4% of the variability observed in SPI. No significant differences were detected between the observed and predicted SPI for the individual forest types. The linear regression model was used to develop maps of the spatial variability in predicted SPI for the individual forest types in the state. The spatial site productivity models developed in this study provides a basis for understanding the complex relationship that exists between forest productivity and site and climatic conditions in the state. Findings of this study will assist resource managers in making cost-effective decisions about the management of individual forest types in the state of Jalisco, Mexico.

关键词： Best management practices climate change spatial predic-tions tropical dry forests weighted least squares

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Isolation, characterization and effect of plant-growth-promoting rhizobacteria on pine seedlings(Pinus pseudostrobus Lindl.)

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Journal of Forestry Research 2019年第5期30卷 1727-1734页

作者： Cristina Heredia-Acuna Juan J.Almaraz-Suarez Ramon Arteaga-Garibay Ronald Ferrera-Cerrato deisy Y.Pineda-Mendoza Area de Microbiologia Postgrado de EdafologiaColegio de PostgraduadosCarretera Mexico-Texcoco km 36.5CP 56230 MontecilloEstado de MexicoMexico Laboratorio de Recursos Geneticos Microbianos Centro Nacional de Recursos GeneticosINIFAPBoulevard de la Biodiversidad No.400CP 47600 Tepatitlan de MorelosJaliscoMexico

In this study,10 bacterial strains were isolated from the rhizosphere of coniferous trees on Mount Tla′loc in *** strains were characterized by their capacity to produce auxins,solubilize phosphates and stimulate mycelial growth of the ectomycorrhizal fungus Suillus *** isolates were identified at the molecular ***,an experiment was established to evaluate the response of Pinus pseudostrobus seedlings to inoculation with the rhizobacteria *** isolated strains belonged to the species Cupriavidus basilensis,Rhodococcus qingshengii,***,Pseudomonas spp.,***,Stenotrophomonas rhizophila and Cohnella *** of the strains produced auxins;the best producer was *** CPT9(76.4 lg mL^-1).*** CPT6 solubilized phosphate at a significant level(443 lg mL^-1).The strain *** CPT8 significantly increased the radial growth of the ectomycorrhizal fungus Suillus *** 18.8%.Five strains increased the dry mass of the shoots;*** CPT4 and *** CPT9 increased growth the most,by more than 20%.Inoculation with plant-growth-promoting rhizobacteria can be a very useful practice in a forest nursery to produce healthy,vigorous plants.

关键词： Biofertilizers Forest species Rhizobacteria Indole acetic acid Phosphate solubilization

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