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Search Results: 1 - 10 of 28509 matches for " Ismael;Rodríguez-Guerra "
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Efecto de la sequía en la producción de biomasa y grano de frijol Drought effect in bean biomass and grain production
Efraín Acosta-Díaz,Ismael Hernández-Torres,Raúl Rodríguez-Guerra,Jorge Alberto Acosta-Gallegos
Revista mexicana de ciencias agrícolas , 2011,
Abstract: La sequía intermitente es el factor que más limita la producción de frijol (Phaseolus vulgaris L.) bajo temporal en México. El objetivo fue determinar el efecto de la sequía sobre la acumulación de biomasa del vástago y el rendimiento de grano en variedades criollas e introducidas de frijol de temporal. Se establecieron dos experimentos, uno con 21 variedades nativas y otro con 15 variedades introducidas, de diferente hábito de crecimiento indeterminado, en la Unidad Académica La Ascensión de la Facultad de Agronomía de la Universidad Autónoma de Nuevo León, México en 2009. Los experimentos se condujeron bajo dos tratamientos de humedad del suelo: riego durante todo el ciclo y sequía. En el tratamiento de riego el suelo se mantuvo por encima de 60% de humedad aprovechable durante el ciclo del cultivo, mediante la precipitación y cuatro riegos de auxilio (dos antes y otros dos después de floración), mientras que en el tratamiento de sequía el riego se suspendió a partir del inicio de la floración. En los dos experimentos, bajo la condición de sequía la acumulación de biomasa del vástago y el rendimiento de grano fue significativamente inferior (p≤ 0.01) que en el tratamiento de riego. En general, el efecto del tratamiento de sequía sobre el peso seco del vástago fue mayor en las variedades nativas, mientras que el efecto sobre el rendimiento de grano fue mayor en las variedades introducidas. En sequía, las variedades de mayor rendimiento, fueron: nativas, Pinto-2, Pinto-1, Amarillo Mantequilla, Boleado, Bayo Blanco, Canelo y Quipincillo Rojo-1 e introducidas, Peruano, Flor de Mayo Media Oreja, Pinto-5 y Ojo de Cabra. De acuerdo con el índice de susceptibilidad a la sequía y la media geométrica, las variedades más eficientes para la producción de rendimiento de grano en ambas condiciones de humedad fueron: Pinto-2, Amarillo Mantequilla, Pinto-1, Boleado, Peruano, Flor de Mayo Media Oreja, Pinto-5 y Ojo de Cabra; sin excepción, todas estas variedades fueron colectadas en la región de prueba, lo que demuestra la importancia de la adaptación local en condiciones de sequía. Intermittent drought is most limiting factor for bean production (Phaseolus vulgaris L.) under seasonal conditions in Mexico. Aim of this work was to determine drought effect on biomass accumulation of sprout and grain yield in creole and introduced seasonal bean varieties. Two experiments were set, one with 21 native varieties and another with 15 introduced varieties, from different uncertain type growth habit, at Academic Unit La Asención from Agronomy School of Universidad Autónoma de Nu
Efecto de la sequía en la producción de biomasa y grano de frijol
Acosta-Díaz, Efraín;Hernández-Torres, Ismael;Rodríguez-Guerra, Raúl;Pedroza-Flores, Jesús;Amador-Ramírez, Mario D.;Padilla-Ramírez, José Saúl;
Revista mexicana de ciencias agrícolas , 2011,
Abstract: intermittent drought is most limiting factor for bean production (phaseolus vulgaris l.) under seasonal conditions in mexico. aim of this work was to determine drought effect on biomass accumulation of sprout and grain yield in creole and introduced seasonal bean varieties. two experiments were set, one with 21 native varieties and another with 15 introduced varieties, from different uncertain type growth habit, at academic unit la asención from agronomy school of universidad autónoma de nuevo león, mexico in 2009. experiments were done under two treatments of soil humidity: irrigation during whole cycle and drought. in irrigation treatment soil was kept above 60% of serviceable humidity during cultivation cycle, by precipitation and four irrigation aids (two before and other two after flowering), while in treatment of drought irrigation was suspended when flowering started. in both experiments, under drought condition biomass accumulation of sprout and grain yield was significantly lower (p≤ 0.01) than in irrigation treatment. in general, effect of drought treatment on sprout's dry weight was greater in native varieties, while effect on grain yield was greater in introduced varieties. in drought, varieties with higher yield were: native, pinto-2, pinto-1, amarillo mantequilla, boleado, bayo blanco, canelo and quipincillo rojo-1; and introduced, peruano, flor de mayo media oreja, pinto-5 and ojo de cabra. in accordance with drought susceptibility index and geometric average, most efficient varieties for production of grain yield under both humidity conditions were: pinto-2, amarillo mantequilla, pinto-1, boleado, peruano, flor de mayo media oreja, pinto-5 and ojo de cabra; without exception, all these varieties were collected in test region, which demonstrates importance of local adaptation under drought conditions.
Patotipos de Colletotrichum lindemuthianum y su implicación en la generación de cultivares resistentes de frijol
Rodríguez-Guerra, Raúl;Acosta-Gallegos, Jorge Alberto;González-Chavira, Mario Martín;Simpson, June;
Agricultura técnica en México , 2006,
Abstract: colletotrichum lindemuthianum, the causal agent of bean anthracnose causes substantial losses in the production of this legume around the world. the main strategy for the control of this pathogen is the use of resistant cultivars. the great variety of pathotypes shown by c. lindemuthianum hampers the wider utilization of resistant cultivars developed for specific regions and resistant to specific local c. lindemuthianum pathotypes already characterized. therefore, the success of breeding programs requires the identification of the pathotypes that are present in the regions for which resistant cultivars will be developed and to use sources of resistance genes against the prevalent pathotypes. the objectives of this essay are: i) make known the frequency and distribution of the c. lindemuthianum pathotypes identified in mexico to date, ii) point out possible sources of resistance within the set of differential cultivars used for pathotype identification of the fungus, which could be used in breeding programs in common bean, iii) postulate the resistance genes carried by bean cultivars previously characterized on the basis of their reaction to pathotypes of the fungus. this information offers researchers and bean breeders the opportunity to select sources of resistance to the pathogen and the possibility of accumulating resistance genes in improved cultivars of commercial value for different regions of mexico. an example could be the incorporation of the resistance genes from the differentials kaboon (co-12) and tu (co-5) into improved cultivars or the combination of genes from elite cultivars such as negro inifap (postulated to carry the genes co-12 or co13) and negro 8025 (postulated to carry the genes co-6 or co-8) in the generation of black seeded cultivars resistant to the majority of c. linde muthianum pathotypes found in the country.
Selección de genotipos de chile resistentes al complejo patogénico de la marchitez Selection of chili pepper genotypes resistant to pathogenic wilt disease complex
José Luis Anaya-López,Mario Martín González-Chavira,Emiliano Villordo-Pineda,Raúl Rodríguez-Guerra
Revista mexicana de ciencias agrícolas , 2011,
Abstract: En México la enfermedad de raíz más importante del cultivo de chile es la marchitez, esta se controla principalmente con fumigantes y fungicidas que contribuyen a seleccionar aislados resistentes, y provocan da os al ambiente y a la salud. Una opción inocua con el ambiente podría ser el cultivo de variedades resistentes; sin embargo, hay pocas variedades con resistencia a esta enfermedad. El objetivo del presente trabajo fue aislar los patógenos asociados a la marchitez del chile, en la región centro y norte de México e identificar genotipos de chile resistentes. Durante 2006 y 2007, se colectaron plantas de chile con síntomas de marchitez en 118 lotes de los estados de Chihuahua, Colima, Durango, Guanajuato, Querétaro, San Luis Potosí y Zacatecas, a partir de las cuales se aislaron los patógenos y se obtuvieron cultivos puros. Estos se inocularon individualmente o en mezcla para seleccionar germoplasma resistente en 44 accesiones de chile del banco de germoplasma del INIFAP y 141 colectas procedentes de Durango, Guanajuato, Michoacán, San Luis Potosí y Zacatecas. Fusarium spp. fue aislado con una frecuencia de 42.6%, Rhizoctonia solani 37%, y Phytophthora capsici 3.9%. Se identificaron 26 colectas con al menos un individuo resistente a Fusarium spp., y seis a R. solani. Sólo las accesiones BG102 y BG107 del banco de germoplasma fueron resistentes a P. capsici y a la mezcla de los tres patógenos. Estos materiales tienen potencial para usarse en programas de mejoramiento genético del chile. In Mexico the most important root disease of the chili pepper crop is the wilt disease, it is primarily controlled with fumigants and fungicides that help to select resistant isolates and cause environment and health damage. A safe environmental option could be the resistant varieties cultivation, but there are few disease resistance varieties. This study's aim was to isolate the pathogens associated with chili pepper wilt disease in central and north of Mexico and to identify chili pepper resistant genotypes. During 2006 and 2007, chili pepper plants with wilt disease symptoms were collected in 118 lots from Chihuahua, Colima, Durango, Guanajuato, Querétaro, San Luis Potosí and Zacatecas, from which pathogens were isolated and pure cultures were obtained. They were individually or in mixtures inoculated to select resistant germplasm, in 44 chili pepper accessions of INIFAP's germplasm bank and 141 collections from Durango, Guanajuato, Michoacán, San Luis Potosí and Zacatecas. Fusarium spp., was isolated with a 42.6% frequency, Rhizoctonia solani 37% and Phytophthora
First Report on the Presence of Phyllachora sp. in Corn Crops at Toluca, Estado de Mexico  [PDF]
Erika Natalia Ríos-Herrera, Laila Pamela Partida-Martínez, Yisa María Ochoa-Fuentes, Ernesto Cerna-Chávez, Francisco Daniel Hernández-Castillo, Alberto Flores-Olivas, Víctor Olalde-Portugal, Raúl Rodríguez-Guerra
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.75067
Abstract: Symptoms of Tar Spot Complex (TSC) in corn appear in the form of black spots surrounded by a chlorotic halo known as fish-eye. The crop with these symptoms was found at San Pablo Autopan, Estado de Mexico. The stromal region of foliar lesions was cut longitudinally, showing perithecia, asci and ascospores typical of Phyllachora maydis. The results were confirmed by PCR-ITS with ITS 1 and ITS4 initiators, cloned by pJET, before being sequenced and compared against NCBI’s data base. Phyllachora identity was confirmed. This is the first report where TSC pathogen has been detected under conditions that had not been previously reported, for instance, at 2600 meters above the sea level.
Patotipos de Colletotrichum lindemuthianum en Oaxaca y San Luis Potosí, México, y resistencia en genotipos de frijol
Sánchez-García, Bertha María;Flores-Olivas, Alberto;Sánchez-Arizpe, Abiel;Pineda-Rodríguez, Susana;López-Jiménez, Gabriela;Fraire-Velásquez, Saúl;Garrido-Ramírez, Eduardo Raymundo;Acosta-Gallegos, Jorge Alberto;Simpson Williamson, June;Rodríguez-Guerra, Raúl;
Agricultura técnica en México , 2009,
Abstract: anthracnose, a disease of common bean caused by colletotrichum lindemuthianum (sacc. et magn.) scrib., is worldwide distributed. c. lindemuthianum displays a significant pathogenic diversity which is important to know for the development of resistant cultivars. in mexico 54 pathotypes are known; however, some of the important bean producing states have not been thoroughly sampled. in this research 23 strains of c. lindemuthianum from oaxaca (15) and san luis potosí (8) were pathotypically characterized using twelve differential cultivars, during 2005-2007. in addition, 24 bean landraces from san luis potosí, 115 from guanajuato, as well as 55 bread cultivars, were challenged with the pathotypes 64 and 320 (which occur in both states) that infect differential cultivars from mesoamerican origin, in the search for sources of resistance. twelve and five pathotypes were identified in oaxaca and san luis potosí, respectively, with seven of them (69, 100, 260, 324, 325, 356 and 485) reported for the first time in mexico. results indicate higher pathogenic diversity than previously reported and that newly form or undetected combinations of avirulence genes are pre sent in mexico. from the 24 bean landraces from san luis potosí, 115 from guanajuato, and the 55 bred cultivars challenged, 12, 76 and 28, respectively, were resistant to both races; these genotypes could be used as sources of resistance against c. lindemuthianum.
Selección de genotipos de chile resistentes al complejo patogénico de la marchitez
Anaya-López, José Luis;González-Chavira, Mario Martín;Villordo-Pineda, Emiliano;Rodríguez-Guerra, Raúl;Rodríguez-Martínez, Raúl;Guevara-González, Ramón Gerardo;Guevara-Olvera, Lorenzo;Montero-Tavera, Víctor;Torres-Pacheco, Irineo;
Revista mexicana de ciencias agrícolas , 2011,
Abstract: in mexico the most important root disease of the chili pepper crop is the wilt disease, it is primarily controlled with fumigants and fungicides that help to select resistant isolates and cause environment and health damage. a safe environmental option could be the resistant varieties cultivation, but there are few disease resistance varieties. this study's aim was to isolate the pathogens associated with chili pepper wilt disease in central and north of mexico and to identify chili pepper resistant genotypes. during 2006 and 2007, chili pepper plants with wilt disease symptoms were collected in 118 lots from chihuahua, colima, durango, guanajuato, querétaro, san luis potosí and zacatecas, from which pathogens were isolated and pure cultures were obtained. they were individually or in mixtures inoculated to select resistant germplasm, in 44 chili pepper accessions of inifap's germplasm bank and 141 collections from durango, guanajuato, michoacán, san luis potosí and zacatecas. fusarium spp., was isolated with a 42.6% frequency, rhizoctonia solani 37% and phytophthora capsici 3.9%. 26 collections were identified with at least one of them resistant to fusarium spp., and six to r. solani. only bg102 and bg107 accessions from the gene bank were resistant to p. capsici and to the group of three pathogens. these are potential materials to be used in chili pepper genetic improvement.
Fusarium lateritium: nuevo patógeno de la raíz del frijol en México
Sánchez-García, Bertha María;González-Flores, Francisco;Pons-Hernández, José Luis;Acosta-Gallegos, Jorge Alberto;Cabral-Enciso, Mariandrea;Fraire-Velázquez, Saúl;Simpson, June;Rodríguez-Guerra, Raúl;
Agricultura técnica en México , 2006,
Abstract: root rots in common bean are caused by a complex of soil fungal species. in mexico, 10 fusarium species have been identifi ed in association with root rots in common bean and it has been suggested that f. lateritium has a role as bean pathogen due to its high frequency and wide distribution in several states of central mexico. in this investigation, the pathogenicity of seven isolates of f. lateritium, obtained from four different mexican states, was evaluated on the common bean cultivar montcalm (andean gene pool). the time of appearance and characteristics of symptoms caused by f. lateritium were observed on cv. montcalm and compared to those symptoms caused by f. solani on the same cultivar. all f. lateritium isolates caused symptoms on the roots and hypocotyls of the inoculated plants and signifi cant differences were observed among isolates and between them and the control (p <0.01). the isolates caused reactions from intermediate to susceptible on cv. montcalm which suggests poor variation in the agressiveness of the isolates of f. lateritium when inoculated on common bean. the fungus recovered was only from the inoculated plants. the symptoms caused by f. lateritium were observed seven days after inoculation and were distinguishable from those caused by f. solani at twenty one days after innoculation. results indicated that the f. lateritium isolates obtained from common bean roots in central mexico are pathogenic to this crop and that the cv. montcalm is susceptible.
Comportamiento del proceso de adaptación en un círculo infantil
Guerra Vallejo,Odilia; Pérez Rodríguez,Lourdes; Ferrer Herrera,Ismael; álvarez Aguilera,Sonia;
Revista Cubana de Medicina General Integral , 2000,
Abstract: a descriptive efficacy study was conducted at the " xx aniversario" day care center of the " ignacio agramonte" polyclinic, in the municipality of camagüey, from september to december, 1993. 23 children that started the process of adaptation were studied to know their behaviour. variables on the incidences of planning, making, control and attention and guidance of parents, as well as the causes of the dificulties and the measures taken were included. 2-year-old children ( 56. 5 %) predominated among the studied children. 65. 2 % were males, 100 % had parents with a good economic level, 93 % had parents with an adequate educational level and 60. 8 % were from families integrates into society. the use of pacifier (30.4 %) and the alteration of the nutritional habits ( 21. 7 %) prevailed among the negative habits, whereas the chronic respiratory diseases ( 47.7 %) and the speech disorders ( 43.4 %) predominated among the personal pathological histories. finally, the difficulties found were: inadequate planning an making of the process, negative repercussion of acute respiratory infections and the inappropiate management by the family, and the frequent difficulties presented by children to adapt themselves to the day care center
Comportamiento del proceso de adaptación en un círculo infantil
Odilia Guerra Vallejo,Lourdes Pérez Rodríguez,Ismael Ferrer Herrera,Sonia álvarez Aguilera
Revista Cubana de Medicina General Integral , 2000,
Abstract: Se realizó un estudio descriptivo de eficacia en el Círculo Infantil "XX Aniversario", del Policlínico "Ignacio Agramonte" del municipio Camagüey, entre septiembre y diciembre de 1993, en 23 ni os que comenzaron el proceso de adaptación para conocer su comportamiento. Se incluuyeron variables sobre las incidencias de la planificación, realización, control y atención y orientación a los padres, causas de las dificultades y medidas tomadas. Entre los ni os estudiados predominaron los del 2do. a o de vida (56,5 %), del sexo masculino (65,2 %), de padres con buen nivel económico (100 %) y de escolaridad (93 %), procedentes de familias integradas (60,8 %). El uso del chupete (30,4 %) y la alteración de los hábitos alimentarios (21,7 %) predominaron entre los hábitos negativos; mientras que las enfermedades respiratorias crónicas (47,7 %) y las alteraciones del lenguaje (43,4 %) entre los antecedentes patológicos personales. Finalmente las dificultades encontradas fueron: inadecuada planificación y realización del proceso, repercusión negativa de las infecciones respiratorias agudas y el manejo inadecuado por la familia, y presentación frecuente de adaptaciones difíciles A descriptive efficacy study was conducted at the " XX Aniversario" Day Care Center of the " Ignacio Agramonte" Polyclinic, in the municipality of Camagüey, from September to December, 1993. 23 children that started the process of adaptation were studied to know their behaviour. Variables on the incidences of planning, making, control and attention and guidance of parents, as well as the causes of the dificulties and the measures taken were included. 2-year-old children ( 56. 5 %) predominated among the studied children. 65. 2 % were males, 100 % had parents with a good economic level, 93 % had parents with an adequate educational level and 60. 8 % were from families integrates into society. The use of pacifier (30.4 %) and the alteration of the nutritional habits ( 21. 7 %) prevailed among the negative habits, whereas the chronic respiratory diseases ( 47.7 %) and the speech disorders ( 43.4 %) predominated among the personal pathological histories. Finally, the difficulties found were: inadequate planning an making of the process, negative repercussion of acute respiratory infections and the inappropiate management by the family, and the frequent difficulties presented by children to adapt themselves to the day care center
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