Polibotanica最新文献

{"title":"Actividad antimicrobiana in vitro de extractos de Jatropha dioica seseé contra bacterias fitopatógenas de tomate","authors":"J. Pérez-Pérez, Diana Guerra-Ramírez, Benito Reyes-Trejo, J. Cuevas-Sánchez, P. Guerra-Ramírez","doi":"10.18387/polibotanica.49.8","DOIUrl":"https://doi.org/10.18387/polibotanica.49.8","url":null,"abstract":"espanolResumen: Se utilizo el metodo de microdiluciones en microplaca para evaluar la inhibicion del crecimiento in vitro de las bacterias fitopatogenas Clavibacter michiganensis subsp. michiganensis (Cmm), Pseudomonas syringe pv. tomato (Pst) y Xanthomonas campestris pv. vesicatoria (Xcv) con extractos de diferente polaridad obtenidos a partir de raices de Jatropha dioica Sesee (Sangre grado), especie vegetal endemica de Mexico valorada en la medicina tradicional por sus propiedades farmacologicas y curativas. Como indicador de respiracion celular en cultivos bacterianos expuestos a extractos, se utilizo cloruro de 2,3,5-trifeniltetrazolio. Los extractos metanolico, hexanico y de acetato de etilo, presentaron actividad antimicrobiana contra los fitopatogenos Cmm, Pst y Xcv. De acuerdo con los resultados, el extracto hexanico mostro la menor concentracion Inhibitoria Media Maxima (IC50) contra Pst y Xcv (0.5 ± 0.01 y 1.7 ± 0.36 mg mL-1, respectivamente) por lo que se separo por cromatografia en columna. Como resultado, se aislo y purifico un solido cristalino blanco identificado espectroscopicamente como citlalitriona, dicho compuesto tambien presento actividad contra las bacterias Cmm, Pst y Xcv con una CI50 de 1.0 ± 0.13, 1.0 ± 0.11 y 1.1 ± 0.19 mg mL-1, respectivamente. Estos resultados in vitro abren la posibilidad de utilizar extractos vegetales de J. dioica para el control de las enfermedades causadas por las bacterias estudiadas en el cultivo de tomate, ofreciendo una alternativa al uso de antibioticos o compuestos de cobre. EnglishAbstract: The microplate microdilution method was used to evaluate the inhibition of in vitro growth of Clavibacter michiganensis subsp michiganensis (Cmm), Pseudomonas syringe pv. tomato (Pst) and Xanthomonas campestris pv. vesicatory (Xcv) phytopathogenic bacteria, with extracts of different polarity obtained from roots of Jatropha dioica Sesee (Blood grade), endemic plant species of Mexico valued in traditional medicine for its pharmacological and healing properties. As an indicator of cellular respiration in bacterial cultures exposed to extracts, 2,3,5-triphenyltetrazolium chloride was used. The methanolic, hexane and ethyl acetate extracts showed antimicrobial activity against the phytopathogens Cmm, Pst and Xcv. According to the results, the hexane extract showed the lowest Maximum Average Inhibitory concentration (IC50) against Pst and Xcv (0.5 ± 0.01 and 1.7 ± 0.36 mg mL-1, respectively), so it was separated by column chromatography. As a result, a white crystalline solid identified spectroscopically as citlalitrione was isolated and purified, said compound also exhibited activity against the Cmm, Pst and Xcv bacteria with an IC50 of 1.0 ± 0.13, 1.0 ± 0.11 and 1.1 ± 0.19 mg mL-1, respectively. These in vitro results open the possibility of using plant extracts of J. dioica for the control of diseases caused by the bacteria studied in tomato cultivation, offering an alternative to the use of antibiotics ","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49453011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variabilidad morfológica de chicozapote de Nayarit, México","authors":"B. G. Arrieta-Ramos, A. Villegas-Monter, P. G. Ruelas-Hernández, C. R. Juárez-Rossete, K. J. Partida-Lucian.","doi":"10.18387/polibotanica.49.6","DOIUrl":"https://doi.org/10.18387/polibotanica.49.6","url":null,"abstract":"El objetivo de esta investigacion fue conocer la variabilidad morfologica en arboles de chicozapote  (Manilkara zapota (L.) P. Royen, Sapotaceae) en Nayarit, Mexico, e identificar materiales sobresalientes para produccion de fruta. Se realizaron recorridos de campo, se ubicaron y caracterizaron 55 arboles. Se tomaron variables morfologicas y agronomicas. Se realizo estadistica descriptiva, analisis de correlacion, componentes principales y analisis de conglomerados jerarquicos. Se encontro variabilidad entre los arboles de chicozapote. Se identificaron materiales con cascara gruesa, vida larga en postcosecha y frutos sin semilla. El largo de la hoja fluctuo de 115.57 y 40.16 mm, el ancho de 43.65 a 14.47mm; largo del fruto vario de 89.12 a 34.05 mm, ancho de 68.12 a 25.87 mm, el peso de 178.61 A 8.8 g y el numero de semillas de 6.7 a cero. En el dendograma de similitud se formaron seis grupos a una distancia euclidiana de 0.06.","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42191519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GERMINACIÓN Y CRECIMIENTO ex vitro E in vitro DE CINCO ESPECIES DE CACTÁCEAS DEL GÉNERO Mammillaria","authors":"Gabriel Ramírez González, O JoséLuisRodríguezdela, J. M. Solís, M. T. C. León","doi":"10.18387/POLIBOTANICA.48.8","DOIUrl":"https://doi.org/10.18387/POLIBOTANICA.48.8","url":null,"abstract":"Se comparo la germinacion  y ritmo de crecimiento (RGR) de M. albilanata, M. bocasana, M. columbiana , M. rhodantha y M. spinosissima  bajo condiciones ex vitro  e  in vitro . En el primer caso se evaluo los porcentajes de germinacion (PG), velocidad de germinacion (VG) y germinacion media (G 50 ). En el segundo, se evaluo el RGR luego de 40 semanas de cultivo. El tratamiento in vitro consistio de medio Murashigue-Skoog (MS) al 25% para germinacion, y  MS al 50% con dosis de sacarosa (3,6 y 9%) para crecimiento, mientras que el tratamiento ex vitro fue a partir de una mezcla de tierra de hoja y tezontle (1:1). El analisis de varianza y las pruebas de Tukey evidenciaron diferencias significativas entre las respuestas generadas a nivel de tratamientos y especies ( p<0.05 ), obteniendose mejores resultados en el tratamiento in vitro . Por otro lado, la suplementacion de sacarosa al 6% y 9%  genero un mayor ritmo de crecimiento en la parte aerea , mientras que al 3%  se presento un ritmo de crecimiento mayor en raices, en ambos casos superiores al tratamiento ex vitro . La tasa de sobrevivencia de plantas obtenidas en ambas condiciones fue del 100%.","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41509631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GERMINACIÓN Y CARACTERÍSTICAS DE PLÁNTULAS DE Uspí (Couepia polyandra: Chrysobalanaceae) EN CONDICIONES DE VIVERO RÚSTICO EN CAMPECHE, MÉXICO","authors":"Sol de Mayo Araucana Mejenes-López","doi":"10.18387/POLIBOTANICA.48.9","DOIUrl":"https://doi.org/10.18387/POLIBOTANICA.48.9","url":null,"abstract":"Couepia polyandra (Kunth) Rose pertenece a la familia Chrysobalanaceae y es la unica especie de este genero de arboles que habita en Mexico y su distribucion es neotropical. En la Republica Mexicana crece silvestre en los estados de la vertiente del Pacifico y el Golfo hasta la Peninsula de Yucatan. El arbol es conocido en el estado de Campeche con el nombre de Uspi, produce un fruto de drupa pulposa color amarillo-naranja, que es consumido por la poblacion. El objetivo fue determinar las caracteristicas de las semillas y el porcentaje de germinacion de las semillas sembradas en tierra libre de fertilizantes acondicionadas en viveros rusticos. Se tomaron 47 semillas por cada arbol de tres sitios, teniendo un total de 141, a las cuales se les midio altura, ancho, peso, porcentaje de germinacion, asi como altura y diametro de la plantula. Se observo que las semillas mas pequenas provenian de La Viuda, Palizada, mismas que presentaron el mayor porcentaje de germinacion y mayor viabilidad. Dada la importancia de la planta, se deben considerar estas caracteristicas, para la seleccion de semillas y propagacion en viveros.","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48134839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANÁLISIS DE LAS PLANTAS COMESTIBLES, FRUTAS Y VERDURAS, OFERTADAS EN EL TIANGUIS DE TEPEXI DE RODRÍGUEZ, PUEBLA, MÉXICO","authors":"D. Martínez-Moreno, J. Reyes-Matamoros, V. Rivera-Mendoza, F. Basurto-Peña","doi":"10.18387/POLIBOTANICA.48.14","DOIUrl":"https://doi.org/10.18387/POLIBOTANICA.48.14","url":null,"abstract":"espanolRESUMEN: En el estado de Puebla se han estudiado 17 mercados, de los cuales 11 pertenecen a la ciudad de Puebla y los otros a distintos municipios. En dichos estudios no hay homogeneidad en cuanto a la informacion recabada, esto es el reflejo de la inconsistencia en el muestreo, ademas de que la mayoria de los trabajos se enfocan al area medicinal y muy pocos a la comestible. Por ello, el objetivo del estudio fue realizar un analisis de las especies comestibles que se comercializan en el tianguis “El Moralillo” en Tepexi de Rodriguez, Puebla, Mexico. El estudio inicio con visitas al tianguis donde se registraron las plantas comestibles, y se aplicaron encuestas estructuradas a los comerciantes. Se contabilizo al inicio el numero de puestos que conforman la estructura basica del tianguis, asimismo, se registraron las especies comestibles que se comercializan en los locales mediante la presencia-ausencia durante el ano. Estos datos fueron utilizados para estimar las especies de menor y mayor presencia. En el tianguis se registraron 593 puestos, donde se identifican 15 categorias, de las cuales, las frutas y verduras representan el 30% de los puestos. Se ofertan 95 especies comestibles, distribuidas en 95 generos y 49 familias; las familias con mayor numero de especies fueron Fabaceae y Solanaceae. En frutas se identificaron 33 especies de mayor presencia, y 37 especies de verduras con mayor presencia. La estructura vegetal de mayor comercializacion fue el fruto, hoja, raiz, semilla, hoja, tallo y bulbo, respectivamente. El tianguis ″El Moralillo″ es un tianguis tradicional. El analisis cuantitativo de las especies que se comercializan indica que muchas de las especies de menor presencia son de temporal y colectadas de las comunidades naturales, y ello, posiblemente provoque a mediano plazo la falta de organismos juveniles que reemplacen a los maduros y viejos. EnglishABSTRACT: In the Puebla, state 17 markets have been studied; of which 11 belong to the Puebla city and the others to different municipalities. In these studies, there is no homogeneity in terms of the information collected, this reflects the inconsistency in the sampling, in addition to the fact that most of the works focus on the medicinal area and very few on the edible one. Therefore, the aim of the study was to carry out an analysis of the edible species that are traded in the \"El Moralillo\" market in Tepexi de Rodriguez, Puebla, Mexico. The study began with visits to the market where the edible plants were registered, and structured surveys were applied to the merchants. The number of posts that make up the basic structure of the market was counted at the beginning, as well as the edible species that are commercialized in the premises through the presence-absence during the year. These data were used to estimate the species of smaller and greater presence. In the market, 593 posts were registered, where 15 categories are identified, of which, fruits and vegetables represent","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46715802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LISTA ACTUALIZADA DE LAS BIGNONIACEAE DE TABASCO, MÉXICO","authors":"C. M. Burelo-Ramos, M. A. Guadarrama-Olivera","doi":"10.18387/POLIBOTANICA.48.1","DOIUrl":"https://doi.org/10.18387/POLIBOTANICA.48.1","url":null,"abstract":"This paper lists the Biognaceae species distributed in Tabasco state, using the proposed nomenclature based on the new classification schemes generated by recently reconstructed phylogenies. In order to complete the list, collects across all Tabasco state were made, hebarium of the state and the country were reviewed, the review on line of specimens of the herbarium coming from Tabasco was the base for this list, the species were determined and corroborated using available works of Bignoniaceae (Veracruz and Guatemala) and the consultation of the \"Allianza Tabebuia\" and the synopsis of the Bignonieae tribe, besides the \"World Checklist of Bignoniacead\" was consulted. Bignoniaceae is represented by 47 species and 24 genus, four of those species are new records for the state. The more diverse genus are Bignonia L. Amphitecna Miers y Fredericia Mart. with five species each. The lianas are the most abundant with 30 species, followed by the trees with 14 species and the shurbs with 3. There are no species of restricted distribution in Tabasco. Handroanthus chrysanthus S.O. Grose is listed in the Official Mexican Norm under the threatened category. The Bignoniaceae record in Tabasco represents that the state protects 80% of the genera and 61% of the species of Bignoniaceae of Mexico.","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42130186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANÁLISIS FITOQUÍMICO CUALITATIVO DE LOS EXTRACTOS ACUOSOS DE Thalassia testudinum BANKS EX KÖNING ET SIMS DE LA LOCALIDAD DE CHAMPOTÓN, CAMPECHE, MÉXICO, DURANTE EL CICLO ANUAL 2016-2017","authors":"R. U. García-Granados, F. Cruz-Sosa, F. Alarcón-Aguilar, A. Nieto-Trujillo, M. E. Gallegos-Martinez","doi":"10.18387/POLIBOTANICA.48.12","DOIUrl":"https://doi.org/10.18387/POLIBOTANICA.48.12","url":null,"abstract":"espanolRESUMEN: Thalassia testudinum Banks ex Koning et Sims es una fanerogama marina, monocotiledonea, dioica, que se distribuye desde Florida y Golfo de Mexico, hasta las costas de Colombia y Venezuela. Recientes investigaciones han mostrado que T. testudinum presenta actividad antiinflamatoria, antinociceptiva, antioxidante, antiviral, dermorregeneradora, hipoglucemiante, hipolipidemica y neuroprotectora. El objetivo de la presente investigacion fue analizar la variabilidad estacional en el contenido de metabolitos de los extractos acuosos de la planta completa, las hojas y el rizoma de T. testudinum de tres epocas del ano (Nortes, Secas y Lluvias) en la localidad de Champoton Campeche, Mexico. Se determino la presencia de fenoles, flavonoides, fitoesteroles, cumarinas, diterpenos, triterpenos, saponinas, y azucares reductores mediante pruebas cualitativas y se cuantificaron las saponinas contenidas en estos extractos, asi como su capacidad hemolitica. Los extractos de las hojas de la epoca de Nortes presentaron la mayor concentracion de constituyentes. El contenido de azucares reductores en los extractos del rizoma estuvo presente durante todo el ciclo anual, mientras que contenido de saponinas fue mayor en los extractos de hojas de la epoca de Nortes, al igual que su capacidad hemolitica. Los resultados indican que la epoca de Nortes es la mas adecuada para la obtencion de material biologico de T. testudinum para preparar extractos acuosos con posible aplicacion biotecnologica o farmacologica, colectado en la localidad de Champoton, Campeche, Mexico. EnglishABSTRACT: Thalassia testudinum Banks ex Koning et Sims is a marine phanerogam, monocotyledonous, dioica that is distributed from Florida and Gulf of Mexico, up to the coasts of Colombia and Venezuela. Recent researches have shown that T. testudinum has anti-inflammatory, antinociceptive, antioxidant, antiviral, dermo-regenerative, hypoglycemic, hypolipidemic and neuroprotective activity. The purpose of this investigation was to analyze the seasonal variability in the content of metabolites in the aqueous extracts of the whole plant, the leaves and the rhizome of T. testudinum during the seasons of the year (northern, dry and rainy) in Champoton, Campeche, Mexico. The presence of phenols, flavonoids, phytosterols, coumarins, diterpenes, triterpenes, saponins, and reducing sugars was determined by qualitative tests and the saponins contain in these extracts was quantified, as well as its hemolytic capacity. The extracts of the leaves of the northern period presented the highest concentration of constituents. Reducing sugars content in rhizome extracts was present throughout the annual cycle, while the content of saponins was higher in the leave extracts of the northern season, as well as its hemolytic capacity. The results indicate that the northern season is the most suitable for obtaining biological material of T. testudinum to prepare aqueous extracts with biotechnological or pharmacolog","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41905599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"VIABILIDAD Y GERMINACIÓN DE SEMILLA DE Cordia elaeagnoides A. DC.","authors":"S. Solís-Sandoval, M. Gómez-Romero, C. Velázquez-Becerra","doi":"10.18387/POLIBOTANICA.48.10","DOIUrl":"https://doi.org/10.18387/POLIBOTANICA.48.10","url":null,"abstract":"A loss in seed viability has been identified in important forest species, which is why it is necessary to develop strategies that address the problem, as well as to recognize morphologically superior individuals to favor the production and quality of germplasm. The present work evaluated the viability and germination of Cordia elaeagnoides in the municipalities of Tumbiscatío and La Huacana in the state of Michoacán, México, generating information that supports their use. Eight seed trees were selected according to the protocols of the International Seed Testing Association Solís-Sandoval, S.; M. Gómez-Romero, y C. Velázquez-Becerra.","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43495863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EXPLORACIÓN Y CARACTERIZACIÓN DE POBLACIONES DE Carica papaya \u0000Y Jacaratia mexicana: PARTICULARIDADES DE FRUTOS","authors":"J. C. álvarez-Hernández, J. Z. Castellanos-Ramos, C. Aguirre-Mancilla","doi":"10.18387/POLIBOTANICA.48.4","DOIUrl":"https://doi.org/10.18387/POLIBOTANICA.48.4","url":null,"abstract":"Mexico conserves a great diversity of wild relatives of cultivated plants; for example, different Solanaceae, Cucurbitaceae and Caricaceae species families. In the latter, the Carica and Jacaratia genus are the most notable for the similarity of the fruits, but still poorly studied. These populations develop under edapho-climatic and phytosanitary pressure. Due to the interest to take advantage of these materials, the objective was to identify, collect and characterize C. papaya and J. mexicana germplasm. Populations were identified in four Mexican states, sites were characterized and fruits were collected in the populations. Size, weight and number of Álvarez-Hernández, J.C.; J. Z. Castellanos-Ramos, y C.L. Aguirre-Mancilla EXPLORACIÓN Y CARACTERIZACIÓN DE POBLACIONES DE Carica papaya Y Jacaratia mexicana: PARTICULARIDADES DE","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46514130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GERMINATION RESPONSE OF TWO SHRUB SPECIES UNDER CONTROLLED CONDITIONS AND TO SECONDARY VEGETATION REMOVAL (WEEDING) IN THE MAGDALENA RIVER BASIN, MEXICO","authors":"Yuriana Martínez-Orea, A. Orozco-Segovia, L. Bonilla-Valencia, J. A. Zavala-Hurtado, E. Vega-Peña, S. Castillo-Argüero","doi":"10.18387/POLIBOTANICA.48.11","DOIUrl":"https://doi.org/10.18387/POLIBOTANICA.48.11","url":null,"abstract":"Temperate forests are heterogeneous because of their variable topography which causes that environmental variables are different between slopes. The availability of microsites for seed germination is crucial for natural regeneration. Secondary vegetation removal (weeding) is practiced in Central Mexico’s forests as part of silvicultural practices. To evaluate its effects on germination we performed an experiment with microsite types of different orientations South/North (S/N) and with/without secondary vegetation (Undisturbed/Perturbed) (US, UN, PS, PN). Light (global site factor [GSF] and red/far-red [R/FR] ratio), soil temperature, moisture, pH, nitrogen (Ni) and germination of two shrub species were measured at 24 microsites. Results were analyzed with generalized linear models, variation coefficients and Kruskal-Wallis tests. Light values exhibited higher values at US because South-facing sites receive higher solar radiation than North-facing ones and because canopy gaps were larger. R/FR ratios were significantly different between U and P, and N and S microsites; the highest values were registered at PS microsites because of their orientation and because of the absence of understory vegetation, which filters light. Soil temperature was the highest at PS and PN. Soil moisture was the highest at UN and US because secondary vegetation avoids soil moisture loss. Germination percentages of both species were the highest at US because secondary Martínez-Orea, Y., A. OrozcoSegovia, L. Bonilla-Valencia, J.A. Zavala-Hurtado, E. VegaPeña, and S. Castillo-Argüero GERMINATION RESPONSE OF TWO SHRUB SPECIES","PeriodicalId":30046,"journal":{"name":"Polibotanica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46914730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}