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| Registros recuperados: 415 | |
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| Hernández-León,R; Martínez-Trujillo,M; Valencia-Cantero,E; Santoyo,G. |
| Rhizospheric soil of wheat plants contains a high diversity of microorganisms, and therefore, comprises a large reservoir for discovering genes with diverse agro-biotechnological applications. In this work, we constructed an E. coli metagenomic library based on bacterial artificial chromosome (BAC) clones with large genomic inserts from metagenomic DNA from the rhizosphere of wheat plants. The average of the DNA cloned segments varies from 5 to 80 kb, with an average size of 38 kb. Random clones were end-sequenced and homology results showed that the clonation of metagenomic DNA codes mainly for metabolic and catalytic functions (40%), including amidohydrolase, hydrolase, peptidase, serine protease, endonuclease and exonuclease. Another interesting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metagenomics; Rhizosphere; Wheat. |
| Ano: 2012 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000100018 |
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| Liu,ZG; Cai,YL; Li,K. |
| Induced responses to herbivory are physical, nutritional, and allelochemical traits that change in plants following disturbances, and reduce the performance and/or preference of leaf tissues on herbivores. This study gave evidence to the induced defense theory through the simulated herbivory in Schima superba, one of common dominant trees in subtropical evergreen, broadleaf forests in southern China. Results showed that leaves damaged at the beginning of leaf expansion would develop into having a larger area, higher toughness and higher tannin concentrations, but a lower water content compared with control leaves. As a result, they experienced lower herbivory rates than controls. These results indicate that simulated herbivory on leaves of S. superba (1)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Induced response; Herbivory; Simulated herbivory; Nitrogen content; Schima superba. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100012 |
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| Valdés Oyervides,FJ; Rivas Morales,C; Benavides Mendoza,A; Núñez González,MA; Verde Star,J; Oranday Cárdenas,A; Robledo Torres,V. |
| Se investigaron cuatro condiciones de manejo para evaluar los efectos de estrés sobre la producción de biomasa, aceites esenciales, timol y carvacrol, y acumulación de prolina en Lippia graveolens H.B.K. bajo condiciones de invernadero. En un diseño bifactorial se evaluaron cuatro condiciones o ambientes (Factor B): Solución nutritiva comercial (B0); Agua (B1); estrés moderado (B2) e intermedio (B3), anidados en condiciones estresantes (Factor A): salinidad (NaCl) y concentración iónica (Cu2+) y (Fe2+). La producción de peso fresco y número de hojas fue reducida por el NaCl y las concentraciones de Cu2+ y Fe2+. Sin embargo, en el promedio de los cuatro ambientes no se observaron diferencias significativas. La cantidad de aceites esenciales fue... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Orégano; Sales; Metales; Timol; Carvacrol; Prolina. |
| Ano: 2012 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000200009 |
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| Yang,G; Zhang,Z; Zhang,G; Zhang,H; Han,X; Busso,CA. |
| Phosphorus is an essential macronutrient for all living plants and plant production. Simultaneously, atmospheric nitrogen deposition also affects plant productivity at a global scale. However, few studies have investigated how plants respond to P addition while simultaneously considering N deposition. We investigated plant biomass, nutrient status and stoichiometric ratios on Potentilla tanacetifolia in response to P fertilization under contrasting N addition rates in a typical meadow steppe in Inner Mongol ia, China. Aboveground biomass of P. tanacetifolia increased under increasing levels of P fertilization under conditions of N addition. However, there was no significant change in biomass when only phosphorus was added. Plant leaf and stem P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen; Phosphorus; N: P ratio; Plant organs. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100014 |
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| Yan,PM; Zhang,HF; Wang,Q; Yan,XY; Sun,Y. |
| Isozymes of peroxidase (POD), catalase (CAT), esterase (EST) and superoxide dismutase (SOD) were analyzed on transgenic maize (with external chitinase gene) and its parent by vertical polyacrylamide gel electrophoresis (PAGE). This study was made using shoots at the fourth leaf stage. Results showed that: POD and EST were detected in 6 bands. POD-2 and POD-3 were present at the bud and seedling stages. POD-1, POD-4, POD-5 and POD-6 were only present at the seedling stage. POD-6 expressed stronger in the transgenic maize with chitinase than in its parent. EST-2 was present only at the bud stage, and its expression in transgenic maize was stronger than that in its parent. EST-5 only existed at the seedling stage. EST-4 did not exist in the parent maize... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chitinase; Isozyme; Maize; Antioxidant enzyme system. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200002 |
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| Carreón-Abud,Y; Beltrán-Nambo,MA; Martínez Trujillo,M. |
| El cromo (Cr) es un metal no esencial altamente tóxico para los microorganismos y las plantas y debido a su frecuente uso industrial, ha llegado a ser un agente contaminante para los diferentes agroecosistemas. Los hongos micorrízicos arbusculares (HMA) se asocian con la mayoría de las plantas angiospermas y les confieren efectos benéficos en la absorción de algunos nutrientes. Además, se ha reportado que en algunos casos los HMA pueden conferirle mayor tolerancia a las plantas ante la presencia de metales pesados. El jitomate (Solanum lycorpersicum) es un cultivo de gran importancia en México y en la mayoría de los casos se aplica agua de riego proveniente de embalses a los cuales llegan desechos domésticos e industriales. En este trabajo se determinó el... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Micorriza; Cromo; Jitomate. |
| Ano: 2013 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000100018 |
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| Elsalam,KA; Youssef,K; Almoammar,H. |
| Losses due to postharvest decay may occur at any time during postharvest handling, from harvest to consumption affecting the produce quality and quantity. Accurate identification of the pathogen causing postharvest disease is essential to the selection of an appropriate disease control approach. Nine isolates of Fusarium recovered from orange fruit were identified as Fusarium solani. The fungus is involved with fruit decay. The obtained cultures were purified and grown on potato-dextrose agar (PDA), malt yeast agar (MYA), and Czapek's nutrient media (CNM) under light for identification. A pathogenicity test was carried out to fulfil Koch's postulates. The pathogen could only enter ripe orange fruit through wounds and cracks causing the rot disease. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fusarium fruit rot; Orange; Pathogenicity; ITS. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100018 |
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| Ayerdi Gotor,A; Berger,M; Labalette,F; Centis,S; Daydé,J; Calmon,A. |
| Sunflower oil is naturally rich in both unsaturated fatty acids and numerous minor components, with high levels ofa-tocopherol and phytosterols that could play an important role in plant protection. These micronutriments, tocopherols and phytosterols, also exhibit health benefits for humans including reducing both cardiovascular diseases and aging disorders. a−Tocopherol represents more than 95% of total sunflower tocopherol and has the greatest vitaminic activity. Furthermore, this oil contains high amounts of β-sitosterol which is a promising health beneficial phytosterol. The objective of this study was to compare the content and composition of fatty acids, tocopherols and phytosterols in sunflower oil between different cultivars and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sunflower oil; Fatty acids; Tocopherols; Phytosterols; Genotype x environment interaction; Temperature. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100004 |
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| Ávila-Quezada,G; Sánchez,E; Muñoz,E; Martínez,LR; Villalobos,E. |
| El objetivo del presente trabajo fue determinar la calidad microbiológica de las frutas y hortalizas más importantes en el estado de Chihuahua (México) para conocer los posibles riesgos y aplicar estrategias de prevención previo a su consumo. Muestras de chile jalapeño, chilaca y serrano, melón, tomate saladet, tomate grape, durazno y manzana Golden y Starkimson y de agua de pozo, de canal, de riego, de consumo y de lavado en empaque se analizaron para determinar Salmonella spp., Escherichia coli, coliformes totales y fecales, hongos y levaduras con la metodología marcada en la normatividad mexicana (NOM-111-SSA1-1994). El muestreo se realizó en todo el estado de Chihuahua durante el ciclo de producción 2004. Los resultados sugieren acciones correctivas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Inocuidad alimentaria; Patógeno; Frutas y hortalizas. |
| Ano: 2008 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572008000100011 |
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| Alanís Rodríguez,E; Jiménez Pérez,J; González Tagle,MA; Yerena Yamallel,JI; Cuellar Rodríguez,G; Mora-Olivo,A. |
| El matorral espinoso tamaulipeco (MET) del noreste de México ha sido expuesto a diferentes actividades productivas, las cuales han causado una disminución de la cobertura vegetal y cambios en su estructura. El objetivo de la presente investigación fue cuantificar la variación de la composición de especies vasculares (diversidad beta) y sus rangos de abundancia en cinco áreas del matorral espinoso tamaulipeco con diferente historial de uso silvoagropecuario (ganadería extensiva, ganadería intensiva, agricultura, matarrasa, plantación forestal). En las cinco áreas se establecieron 4 sitios de muestreo (20 en total) para evaluar la regeneración de la vegetación. Se registraron 30 especies pertenecientes a 26 géneros y 15 familias de plantas vasculares. La... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversidad beta; Rangos de abundancia; Silvoagropecuario. |
| Ano: 2013 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000200005 |
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| Wei,TX; Zhang,XJ. |
| In order to examine the nutrient content, and the distribution and accumulation patterns of individual nutrients in the natural secondary forests (NSFs), sample NSF plots were selected in the Caijiachuan watershed on the Loess Plateau. On the basis of a comprehensive field inventory to the NSFs in Caijiachuan watershed, a 40 m × 40 m sample plot was selected as the representative plot. Each tree plant was then measured to select the standard tree in accordance with a diameter-scale. For measurement of the biomass in the above-ground part of the tree, it was divided into parts and measured. The study measured the concentration of the 5 major macronutrients (namely N, P, K, Ca and Mg) and the 8 major micronutrients (namely Cd, Fe, Mn, Cu, Zn, Pb, Ni and B)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass; Biological cycling; Loess Plateau; Microelements; Nutrient elements; China. |
| Ano: 2014 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200001 |
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| Romero-Castillo,PA; Pérez Amador Barron,MC; Guevara Fefer,P; Muñoz Ocotero,V; Reyes Dorantes,A; Aguirre Garcia,F; Amaya Chavez,A. |
| Actualmente se ha despertado el interés científico por la búsqueda de nuevos fármacos con actividad antiinflamatoria, con menos efectos colaterales de los ya existentes en el mercado. En este sentido, las plantas medicinales pueden ser una fuente natural alternativa, como es el caso de Ziziphus amole (Sessé & Moc.) M.C. Johnst. o coróngoro, nativo de México. Se emplea en la medicina tradicional como antiinflamatorio, cicatrizante, analgésico, antidiarreico, en diabetes, asma y hemorroides. El objetivo del presente trabajo fue evaluar el efecto antiinflamatorio de los extractos crudos del coróngoro Z. amole en el modelo de inflamación aguda en edema auricular inducido por 13-acetato-12-O-tetradecanoilforbol (TPA) en ratón, y la actividad... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coróngoro; Ziziphus amole; Modelo biológico; Edema auricular; 13-acetato-12-O-tetradecanoilforbol (TPA); Mieloperoxidasa (MPO). |
| Ano: 2013 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000100011 |
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| Shang,ZH; Xu,SG. |
| Abstract. Pedicularis kansuensis is a dominating poisonous weed, and it might have allelopathic effects on other native grasses in alpine meadows. An experiment was conducted to examine a range of concentrations of aqueous whole plant extracts (25, 12.5, 2.5, 1.25, 0.25 and 0.0 g/L) of P. kansuensis, prepared at the flowering stage on seed germination and seedling growth of two native grasses (Poa pratensis and Elymus nutans). High concentrations of aqueous extracts of P. kansuensis inhibited seed germination and seedling growth of P. pratensis (p< 0.05). Most aqueous extracts of P. kansuensis had a stimulatory (p< 0.05) effect on E. nutans. Our results suggest that the allelopathic ecology of P. kansuensis on other native grasses needs further... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological allelopathy; Aqueous extracts; Weeds; Native grasses; Alpine meadows. |
| Ano: 2012 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000100011 |
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| Martínez Corral,L; Martínez-Rubin,E; Flores-García,F; Vázquez-Rueda,M; Frías-Ramírez,J; Segura-Castruita,MA. |
| La papa (Solanum tuberosum L.) es un cultivo cuya producción a nivel nacional es muy inferior en comparación con los países más productivos. Esta situación se debe en parte a que es un cultivo parcialmente mecanizado, con prácticas agronómicas deficientes e inadecuadas, bajos niveles de tecnificación y gran cantidad de jornales de trabajo requeridos para una hectárea de cultivo. La necesidad de generar técnicas y procedimientos modernos que incrementen la producción, calidad y rendimiento del cultivo, han propiciado el desarrollo de proyectos destinados al mejoramiento de plántulas libres de patógenos con materia de alta calidad genética, fisiológica y sanitaria. La utilización de un sistema de visión para el reconocimiento visual computarizado de la... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Papa; Yemas axilares; Sistemas de visión; Inteligencia artificial. |
| Ano: 2011 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000100012 |
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| Registros recuperados: 415 | |
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