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Search Results: 1 - 10 of 4385 matches for " Ronald FERRERA-CERRATO "
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Glomus intraradices Attenuates the Negative Effect of Low Pi Supply on Photosynthesis and Growth of Papaya Maradol Plants
Nava-Gutiérrez Yolanda,Ronald Ferrera-Cerrato,Jorge M. Santamaría
Journal of Botany , 2012, DOI: 10.1155/2012/129591
Abstract: Low inorganic phosphorus (Pi) supply limits the photosynthetic process and hence plants growth and development. Contradictory reports exist in the literature on whether mycorrhyzal association can attenuate the negative effects of low Pi supply on photosynthesis and growth. In the present paper, the effect that low Pi supply may have on photosynthesis and growth of papaya Maradol plants was evaluated in intact plants and in those inoculated with two different strains of the arbuscular mycorrhizal fungi Glomus intraradices. Plant growth was significantly reduced as the Pi supply decreased. However, inoculation with any strain of G. intraradices was able to attenuate such effect. Without Pi in the nutrient solution, the mycorrhizal plants had on average 6.1 times and 7.5 higher photosynthesis than non mycorrhizal plants. The chlorophyll fluorescence values were significantly higher in mycorrhizal than in non-mycorrhizal plants. These results could be associated to an increased ability of mycorhyzal plants to take up Pi from the substrate, as they had higher Pi content than non-mycorrhizal plants. A high correlation was found between internal Pi content and plant biomass. The lower correlation between Pi content and photosynthesis, suggests that some photosynthates could had been used to maintain the symbiosis. 1. Introduction The scarcity of nutrients is a factor that limits physiological processes in plants, including photosynthesis, their growth, and development [1]. Phosphorus (P) deficiency normally reduces the root system development and plant establishment because it has an important role in cell division, growth, photosynthesis (Pn), respiration, energy storage, and transfer [2–4]. So that, in many agricultural systems, it is necessary to supply P in order to have good productivity [5]. When plants grow with nutrient scarcity, some of them are capable of modifying their root architecture, to exude organic acids, or to establish associations with some beneficial organisms as strategies to compensate for the low concentration of nutrient in the substrate. Among the beneficial organisms for plants, the arbuscular mycorrhizal (AM) fungi have a very important role in plant nutrition [6, 7]. It is through AM association that plants increase their capacity to take up organic phosphorus (Pi) from the soil solution [8–10] that normally translates into better growth than that of non-AM plants [11, 12]. Nevertheless, it has been reported that AM association could be more or less beneficial to the plant growth depending on the plant species and the AM fungi
Efectividad de siete consorcios nativos de hongos micorrízicos arbusculares en plantas de café en condiciones de invernadero y campo Effectiveness of native arbuscular mycorrhizal fungi consortia on coffee plants under greenhouse and field conditions
DORA TREJO,RONALD FERRERA-CERRATO,ROBERTO GARCíA,LUCíA VARELA
Revista chilena de historia natural , 2011,
Abstract: Se probó el efecto de siete consorcios de hongos micorrízicos arbusculares (HMA) aislados de fincas cafetaleras con diferente nivel de tecnología (bajo, medio y alto) del estado de Veracruz, en el crecimiento de plantas de café (Coffea arábica L.) var. Garnica en condiciones de invernadero y de campo. El grado de tecnificación influyó en la composición de especies de HMA, a mayor tecnificación menor número de especies de HMA encontradas. En condiciones de invernadero, los consorcios incrementaron la altura en un 91 % con respecto al testigo absoluto y al testigo fertilizado con fósforo (800 mg Ca(PO4)3 L-1). A los 130 días después de la inoculación (DDI), el mejor consorcio fue La Estanzuela (ES). En condiciones de campo, a los 290 DDI, las plantas inoculadas con los consorcios ES, Miradores (MI), y Paso Grande (PG) tuvieron mayor supervivencia (> 80 %). Los consorcios más efectivos en la promoción de la altura y supervivencia de las plantas en condiciones de campo, procedieron de agroecosistemas con nivel de tecnología medio (MI y ES), mismos que tuvieron mayor número de especies de HMA. Seven arbuscular mycorrhizal fungal (AMF) consortia isolated from coffee plantations with different agricultural inputs (low, intermediate, and high) at several sites of Veracruz State were tested on their effects on the growth of coffee plants (Coffea arábica L.) var. Garnica under nursery and field conditions. Agricultural input influenced the AMF-composition, in which the highest input the lowest number of AMF-species. At greenhouse conditions, AMF-consortia significantly increased plant height (91 %) in comparison to the control and to the P-fertilized control (800 mg Ca(PO4)3 L-1). After 130 days of inoculation (DAI), the best AMF-consortium was La Estanzuela (ES). At field conditions, after 290 DAI, the plants inoculated with the consortia ES, Miradores (MI), and Paso Grande (PG) had greater survival (> 80 %). The most effective AMF-consortia on plant growth promotion and survival under field conditions were collected from intermediate-input agricultural plantations (MI and ES), which also had the greatest number of AMF-species.
ESTABLECIMIENTO Y RESPUESTAS FISIOLóGICAS DE LA SIMBIOSIS Rhizobium tropici-Leucaena leucocephala EN PRESENCIA DE FENANTRENO Y NAFTALENO
Carlos LóPEZ-ORTIZ,Ronald FERRERA-CERRATO,Alejandro ALARCóN,Juan José ALMARAZ
Revista internacional de contaminación ambiental , 2012,
Abstract: Este estudio evaluó el establecimiento de la simbiosis entre Rhizobium tropici CIAT899 y Leucaena leucocephala (Lam.) en sistemas contaminados con naftaleno (NAF) y fenantreno (FEN) y la respuesta de la planta con el contenido de compuestos fenólicos totales (CFT), actividad antioxidante total (AAT) y contenido total de clorofilas (CloroT) y carotenos (CaT). A los 31 días, el NAF tuvo efectos negativos en la formación de nódulos, retardando su aparición hasta el día 25 en presencia de 100 mg/L. Ante 20 mg FEN/L, las plantas de L. leucocephala no mostraron diferencias significativas en la formación de nódulos con respecto al testigo, mientras que a 60 y 100 mg FEN/L la nodulación disminuyó significativamente en 52 %. La inoculación con R. tropici incrementó el peso seco total (PST) hasta en 150 % comparado con las plantas no inoculadas. El CFT en hoja fue significativamente mayor en los tratamientos no inoculados en comparación con aquellos inoculados con R. tropici y significativamente mayor ante FEN que con NAF. Para ambos contaminantes, la concentración de 100 mg/L produjo mayor CFT y AAT en comparación con 20 y 60 mg/L. Para el caso de raíz, los tratamientos sin contaminantes en ausencia de R. tropici presentaron mayor CFT y AAT. Para los nódulos, la AAT incrementó significativamente ante NAF, mientras que ante FEN disminuyó. El NAF o el FEN redujeron significativamente el contenido de CloroT, el cual fue significativamente mayor en plantas con Rhizobium en comparación con las plantas no inoculadas. El contenido de CaT en plantas no inoculadas incrementó en presencia de NAF y FEN.
Potencial de colonización de hongos micorrícico-arbusculares en suelos cultivados con papayo bajo diferentes manejos de producción Colonization potential of arbuscular mycorrhizal fungi in soil cultivated with papaya under different production management
Wendy Sangabriel-Conde,Dora Trejo-Aguilar,Alejandra Soto-Estrada,Ronald Ferrera-Cerrato
Revista mexicana de micología , 2010,
Abstract: El trabajo se realizó en el municipio de Isla localizado en la zona sur del Estado de Veracruz, México. Se evaluó el potencial infectivo de hongos micorrícico-arbusculares (HMA) utilizando suelo de tres huertas de papayo (tipo Maradol) bajo diferentes manejos de producción, clasificadas como: alta tecnología (AT), mediana tecnología (MT) y baja tecnología (BT), además de una parcela testigo (PT) con pasto Cynodon dactylon L. (Fam. Poaceae). En cada parcela se realizaron dos muestreos de suelo y raíces, uno en oto o y otro en invierno. Se sembraron semillas de maíz en 5 diluciones diferentes de suelo-arena estéril (10(0) hasta 10-4). La colonización micorrícica y el potencial infectivo de los HMA se evaluaron después de seis semanas utilizando el método del número más probable (NMP). No se encontraron diferencias significativas en la interacción nivel de tecnología y época de muestreo. El más alto porcentaje de colonización micorrícica en campo se registró en la parcela PT, cuyo suelo también presentó el mayor potencial infectivo para ambas épocas de muestreo con un elevado número de propágulos/100 g suelo: oto o (1122.5 ±433.1-2842) e invierno (431.3 ±170.3-1092.22). La parcela AT presentó un potencial de colonización bajo (10.9 ±4.3-27.6). Los resultados evidencian que el uso y manejo del suelo influye sobre el número de propágulos infectivos. An experiment was conducted in Isla town, at the southern region of the State of Veracruz, Mexico. The arbuscular mycorrhizal fungi potential was evaluated using soil of three papaya plantations (Maradol type), with different agricultural management systems classified as: high technology (AT), median technology (MT) and low technology (BT), and a control plot (PT) with Cynodon dactylon L (Fam. Poacea) grass. Two soil samples were collected, one in autumn and the other in winter. Corn seeds were sown in pots, with five different dilutions (10(0) to 10-4) of sterilized soil and sand. The mycorrhizal colonization and the infective potential were evaluated after six weeks with the most probable number (MPN) method. There were not significative differences at the interaction level of technology and sampling season. The highest mycorrhizal colonization percentage in the field was registered in PT, which showed a larger infective potential on both seasons of sampling, with a higher number of propagules/g soil for autumn (1122.5 ± 433.1-2842) and winter (431.3 ±170.3-1092.22). The AT plot showed a low (colonization potential 10.9 ±4.3-27.6).The results showed that the soil use and management influence the number of infec
Remoción de fenantreno por azolla caroliniana utilizando bioaumentación con microorganismos hidrocarbonoclastas
Castro-Carrillo,Luis Alfredo; Delgadillo-Martínez,Julián; Ferrera-Cerrato,Ronald; Alarcón,Alejandro;
Interciencia , 2008,
Abstract: the aim of this work was to evaluate the ability of azolla caroliniana to grow and to dissipate phenanthrene (phe) by using bioaugmentation with hydrocarbonoclastic microorganisms. a. caroliniana was selected from four mexican strains based on its tolerance to increasing concentrations of phe. afterwards, a. caroliniana was exposed to phe concentrations of 20, 40 and 60mg·l-1 and/or inoculated with the microbial consortium conformed by bacillus stearothermophilus and oscillatoria sp. (bst+osc), strains previously tested for their tolerance to 100mg phe·l-1. after 49 days, the higher dry mass production was observed at the treatment with 20mg phe and at that with bst+osc in presence of 40mg phe·l-1; both treatments had 19.7% more dry mass than the control. treatments with higher dry mass production also had higher nitrogenase activity (7-12nmolc2h4·g-1·h-1), whereas the lowest activity was observed at the treatments with 60mg phe (3-4nmol c2h4·g-1·h-1). the lowest phe dissipation (45%) was observed in a. caroliniana without bst+osc in the presence of 20mg phe; in contrast, the highest phe dissipation (80%) was observed with a. caroliniana, either inoculated or not, when in presence of 60mg phe. this is one of the first reports describing the negative effects of phe on the growth of azolla and its microsymbiont, as well as the potential of a. caroliniana for the dissipation of phe with or without bioaugmentation.
Efectividad de siete consorcios nativos de hongos micorrízicos arbusculares en plantas de café en condiciones de invernadero y campo
TREJO,DORA; FERRERA-CERRATO,RONALD; GARCíA,ROBERTO; VARELA,LUCíA; LARA,LILIANA; ALARCóN,ALEJANDRO;
Revista chilena de historia natural , 2011, DOI: 10.4067/S0716-078X2011000100002
Abstract: seven arbuscular mycorrhizal fungal (amf) consortia isolated from coffee plantations with different agricultural inputs (low, intermediate, and high) at several sites of veracruz state were tested on their effects on the growth of coffee plants (coffea arábica l.) var. garnica under nursery and field conditions. agricultural input influenced the amf-composition, in which the highest input the lowest number of amf-species. at greenhouse conditions, amf-consortia significantly increased plant height (91 %) in comparison to the control and to the p-fertilized control (800 mg ca(po4)3 l-1). after 130 days of inoculation (dai), the best amf-consortium was la estanzuela (es). at field conditions, after 290 dai, the plants inoculated with the consortia es, miradores (mi), and paso grande (pg) had greater survival (> 80 %). the most effective amf-consortia on plant growth promotion and survival under field conditions were collected from intermediate-input agricultural plantations (mi and es), which also had the greatest number of amf-species.
El género fúngico Trichoderma y su relación con los contaminantes orgánicos e inorgánicos
ARGUMEDO-DELIRA, Rosalba;ALARCóN, Alejandro;FERRERA-CERRATO, Ronald;PE?A-CABRIALES, Juan José;
Revista internacional de contaminación ambiental , 2009,
Abstract: the trichoderma fungal species have been fully characterized due to their application to agriculture since they are important antagonists for several horticultural plant pathogens. in contrast, the behavior and the effects of these fungi at contaminated soils have been scarcely studied. this review compiles updated information about the interactions among trichoderma species and organic (petroleum hydrocarbons, explosives, and pesticides) and inorganic (heavy metals and cyanide) pollutants in order to know their potential for remediating contaminated environments. nevertheless, for such purposes, it is needed further experimental research based on applying trichoderma species either to study their physiological, biochemical and molecular responses when exposed to several types of pollutants, or to assess their potential application into the several processes of bioremediation.
Antagonismo in vitro de cepas de Aspergillus y Trichoderma hacia hongos filamentosos que afectan al cultivo del ajo
Quiroz-Sarmiento, Vivian Francisca;Ferrera-Cerrato, Ronald;Alarcón, Alejandro;Lara Hernández, María Encarnación;
Revista mexicana de micología , 2008,
Abstract: this research focused on studying the antagonistic capability of 22 strains of filamentous fungi to penicillium sp. and fusarium spp. garlic pathogens, via in vitro confrontation. either pathogen or antagonist strains were isolated from the rhizosphere or vegetative organs of garlic mature plants collected from celaya, guanajuato. eight out of 22 fungal strains inhibited the growth of the pathogens; six of them belonged to aspergillus species: a. nidulans, a. ochraceus (2 strains), a. wentii (2 strains), and a. niger, and the remaining two strains belonged to the genus trichoderma spp. mycoparasitism, antibiosis, and competition were the main mechanisms by which the fungal strains inhibit the growth of penicillium and fusarium. there were variations among antagonists to attack the pathogens and their fungal structures. in general, antagonists caused grouping, deformation, and lysis on conidia, as well deformation, lysis, and winding on mycelia of the pathogens.
Hongos ectomicorrícicos y la tolerancia a la salinidad en plantas Ectomycorrhizal fungi and tolerance to salinity in plants
SELENE AGUILAR-AGUILAR,JESúS PéREZ-MORENO,RONALD FERRERA-CERRATO,ONéCIMO GRIMALDO-JUáREZ
Revista chilena de historia natural , 2009,
Abstract: El proceso de salinización de los suelos constituye un problema generalizado a nivel global. En este sentido, los hongos ectomicorrícicos tienen una importante participación en la recuperación de suelos forestales ya que involucran una serie de mecanismos celulares que pueden contribuir a la tolerancia a la salinidad en plantas que habitan los bosques templados o boreales. La participación de los hongos ectomicorrícicos en la tolerancia a la salinidad involucra la regulación homeostática de los iones, la mejora de captación de agua y la inducción de genes específicos en las raíces colonizadas. Los hongos ectomicorrícicos pueden estimular la presencia de osmolitos como la prolina, azúcares y polioles que contribuyen en la protección de las células vegetales. Además, estos organismos inducen la síntesis de enzimas antioxidantes y glutatión que participan en la disminución de especies reactivas de oxígeno. Esta revisión ofrece una descripción de la participación de los hongos ectomicorrícicos en la tolerancia a la salinidad en plantas. The process of salinization of the soil is a widespread problem at the global level. In this sense, ectomycorrhizal fungi have an important role in the recovery of forest soil, as it involves a number of cellular mechanisms that may contribute to the salinity tolerance in plants that inhabit temperate and boreal forests. The participation of ectomycorrhizal fungi on the salinity tolerance involves the ion-homeostasis regulation, improving uptake water and inducing specific gene in roots colonized. Likewise ectomycorrhizal fungi can stimulate the presence of osmolytes as proline, sugars and polyols that contribute to the protection of plant cells. Additionally, these organisms stimulate the synthesis of glutathione and antioxidant enzymes involved in the decrease of reactive oxygen species. This review provides an overview of participation of ectomycorrhizal fungi in the salinity tolerance in plants.
EL GéNERO FúNGICO Trichoderma Y SU RELACIóN CON CONTAMINANTES ORGáNICOS E INORGáNICOS
Rosalba ARGUMEDO-DELIRA,Alejandro ALARCóN,Ronald FERRERA-CERRATO,Juan José PE?A-CABRIALES
Revista internacional de contaminación ambiental , 2009,
Abstract: Las especies de hongos que pertenecen al género Trichoderma han sido plenamente caracterizadas por tener aplicación en el ámbito agrícola, principalmente para el control biológico de otros organismos patógenos que atacan a los cultivos. Sin embargo, los estudios sobre su comportamiento y su efecto en ambientes terrestres y acuáticos contaminados han sido escasamente estudiados. Esta revisión pretende hacer una compilación de toda la información actualizada disponible, respecto a la interacción de Trichoderma en presencia de contaminantes de origen orgánico (hidrocarburos del petróleo, explosivos y plaguicidas) e inorgánico (metales pesados y cianuro) con el fin de conocer el potencial de este grupo fúngico en la biorremediación de ambientes contaminados. No obstante, para tales fines, es necesario realizar investigaciones enfocadas en evaluar sus respuestas fisiológicas, bioquímicas y moleculares ante diferentes tipos de contaminantes, y definir con ello su posible aplicación en los diferentes sistemas de biorremediación.
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