oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 266 )

2018 ( 334 )

2017 ( 343 )

2016 ( 540 )

Custom range...

Search Results: 1 - 10 of 200630 matches for " Efraín;Acosta Gallegos "
All listed articles are free for downloading (OA Articles)
Page 1 /200630
Display every page Item
Relación entre índice de área foliar y rendimiento en frijol bajo condiciones de secano
Acosta Díaz, Efraín;Acosta Gallegos, Jorge Alberto;Amador Ramírez, Mario Domingo;Padilla Ramírez, José Saúl;
Agricultura técnica en México , 2008,
Abstract: the leaves of the bean plant are one of the organs more affected by intermittent drought stress. the objective of this research was to determine the relationship between the leaf area index and seed yield at four phenological stages in dry bean cultivars of different grain type grown under rainfed conditions. the study was conducted in the main three producing areas in the state of zacatecas, mexico, during the summer of 2002 at six locations: four in the northwestern area, sown with a cv. negro san luis type; one in the central region, with a cv. of the flor de junio type and one in the southeastern region, with a cv. of the flor de mayo type. in each location, eight fields were chosen and in each two rows of 5 m longitude with four replications. four leaf area index samplings were made at four phenological stages: at the beginning of flowering, beginning of pod formation, beginning seed filling, and intermediate seed filling. seed yield was determined at physiological maturity. the relationship between the leaf area index at different stages and seed yield was determined by simple correlations. in general, average leaf area index increased with the development of the phenological stages, the highest values were observed at the beginning of the seed filling stage. average seed yield varied among locations: 130 g m-2 at the northwestern region with cv. negro san luis type, 139 g m-2 at central with cv. flor de junio type and 95 g m-2 at southwestern with cv. flor de mayo type.
Efecto del riego suplementario en la producción de biomasa y grano de frijol de temporal en Zacatecas, México
Acosta-Díaz, Efraín;Acosta-Gallegos, Jorge Alberto;Amador-Ramírez, Mario Domingo;Padilla-Ramírez, José Saúl;
Agricultura técnica en México , 2009,
Abstract: in the semiarid highlands of north-central mexico, the lack of water for agricultural production is an important problem, particularly since annually a depletion of two m in the water mirror of local wells is taking place and the water storage capacity in dams is limited. because of the above situation, the optimization of water resources through supplemental irrigation in critical stages of bean sown under rainfed conditions is important. the aim of the present research was to determine the effect of supplemental irrigation on shoot biomass accumulation and seed yield in two sets of improved cultivars with different seed type. two experiments were established at cezac experiment station in zacatecas, mexico in 2001; nine black-seeded cultivars were evaluated in one trial, and 14 seed colored cultivars in a second one. all cultivars are of the type iii indeterminate growth habit. two soil moisture levels were utilized: 1) rainfall plus supplemental irrigation and 2) natural rainfall conditions. the rainfall plus supplemental irrigation treatment consisted of maintaining the available soil moisture above 50% throughout the crop-growing season, which was achieved by rainfall plus two irrigations, one at pre- and the second at the flowering stages. the natural rainfall treatment depended only on the rainfall occurred during the growing season. in both experiments, average shoot biomass accumulation and seed yield of the rainfall plus supplemental irrigation were significantly higher (p<0.01) than those in the rainfall treatment. in general, black seeded cultivars, that were significantly later to mature (p<0.05), showed higher shoot dry weight and seed yield in response to the treatment rainfed+supplemental irrigation than the colored cultivars. there was a differential response of the cultivars to the moisture treatments; outstanding black seeded cultivars were negro zacatecas, negro ontiveros and negro z524 from the mesoamerican race, while among seed colored cultiva
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
Adaptation traits in dry bean cultivars grown under drought stress
Acosta-Díaz, Efraín;Acosta-Gallegos, Jorge Alberto;Trejo-López, Carlos;Padilla-Ramírez, José Saúl;Amador-Ramírez, Mario Domingo;
Agricultura técnica en México , 2009,
Abstract: drought is the major constraint to common bean (phaseolus vulgaris l.) production in mexico. the objective of this study was to identify physiological and phenological traits related to drought adaptation in common bean. a field experiment was conducted under a rainout shelter at the valley of mexico experimental station near texcoco, state of mexico. eight common bean cultivars from different genetic races and growth cycle and contrasted drought response were tested under drought stress and non-stress. irrigation was withheld 55 days after sowing at the initiation of flowering, to induce the stressed treatment. starting at this day, six consecutive nondestructive samplings were conducted at noon every other day. in each sampling, leaf water potential, stomata conductance and co2 assimilation rate were determined. data on phenology were also recorded. at physiological maturity, seed yield and shoot biomass were measured. harvest index was calculated. all cultivars exhibited a tendency to escape drought effects throughout accelerated reproductive development. this response was of small magnitude in mesoamerican cultivars negro cotaxtla 91 and bat 477 (type iii) and significant in cultivars from the durango race such as pinto zapata, bayo madero and bayo criollo del llano. significant difference among cultivars for stomata control was observed with high sensitivity in bat 477 and seq 12, cultivars from the mesoamerican race and in ica palmar from nueva granada race. bred and distinct cultivars ica palmar (type i) and pinto villa (type iii) from durango race, displayed high photosynthetic rate and harvest index, traits or mechanisms directly related to seed yield under stress and non-stress conditions.
Evaluación de aguacates criollos en Nuevo León, México: región sur
Acosta Díaz, Efraín;Hernández Torres, Ismael;Almeyda León, Isidro Humberto;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: the state of nuevo león, mexico, is a part of the birthplace of the mexican breed of avocado (persea americana mill, var. drymifolia), where creole varieties are planted in commercial gardens and backyards, with the outstanding use of the variety plátano grueso-1 (local variety). this variety is characterized by an early cycle of physiological maturity, allowing production to concentrate into a relatively short period. the objective of this research was to characterize a group of creole varieties of avocado in the south of nuevo león, using morphological characteristics of the fruit. twenty nine varieties were used including the variety plátano grueso-1 (local variety), present in six commercial gardens and a backyard in the municipalities of aramberri and zaragoza, nuevo león. seventeen materials were identified as having morphological characteristics similar to the variety plátano grueso-1, and they were classified into three groups. the first group is formed by 12 varieties with fruit characteristics similar to those of plátano grueso-1, with a period of early physiological maturity. the second group is composed of three varieties with characteristics similar to those of plátano grueso-1, with an intermediate period of physiological maturity. the third group consists of two varieties with similar fruit characteristics to the variety plátano grueso-1, with a late period of physiological maturity. results suggest that there is a wide variation in the creoles of avocado materials grown in the southern area of the state of nuevo león, which is an alternative for the diversification of the production and to no longer depend almost exclusively on the variety plátano grueso-1.
Evaluación de aguacates criollos en Nuevo León, México: región sur Evaluation of Creole avocados in Nuevo León, Mexico: southern region
Efraín Acosta Díaz,Ismael Hernández Torres,Isidro Humberto Almeyda León
Revista mexicana de ciencias agrícolas , 2012,
Abstract: El estado de Nuevo León, México, forma parte del centro de origen de la raza mexicana de aguacate (Persea americana Mill. var. drymifolia), en donde se cultivan variedades criollas en huertos comerciales y en traspatios, predominando la utilización de la variedad Plátano Grueso-1. Esta variedad se caracteriza por presentar un ciclo temprano de madurez fisiológica, lo cual permite que su producción se concentre en un periodo relativamente corto. El objetivo de esta investigación fue caracterizar un grupo de variedades criollas de aguacate en la región sur del estado de Nuevo León, mediante caracteres morfológicos de los frutos. Se utilizaron 29 variedades incluyendo la variedad Plátano Grueso-1 (testigo local), presentes en seis huertas comerciales y un traspatio en los municipios de Aramberri y Zaragoza, Nuevo León. Se determinaron 17 materiales con características morfológicas similares que la variedad Plátano Grueso-1, los cuales se clasificaron en tres grupos. El primer grupo está formado por 12 variedades con características del fruto similares a la variedad Plátano Grueso-1, con un período temprano de madurez fisiológica. El segundo grupo está integrado por tres variedades con características del fruto similares a la variedad Plátano Grueso-1, con un período intermedio de madurez fisiológica. El tercer grupo está constituido por dos variedades con características del fruto diferentes a la variedad Plátano Grueso, con un periodo tardío de madurez fisiológica. Los resultados obtenidos sugieren que existe una amplia variación en los materiales criollos de aguacate cultivados en la región sur del estado de Nuevo León, lo cual se constituye como una alternativa para diversificar la producción y no depender casi exclusivamente de la variedad Plátano Grueso-1. The State of Nuevo León, Mexico, is a part of the birthplace of the Mexican breed of avocado (Persea americana Mill, var. drymifolia), where Creole varieties are planted in commercial gardens and backyards, with the outstanding use of the variety Plátano Grueso-1 (local variety). This variety is characterized by an early cycle of physiological maturity, allowing production to concentrate into a relatively short period. The objective of this research was to characterize a group of Creole varieties of avocado in the south of Nuevo León, using morphological characteristics of the fruit. Twenty nine varieties were used including the variety Plátano Grueso-1 (local variety), present in six commercial gardens and a backyard in the municipalities of Aramberri and Zaragoza, Nuevo León. Seventeen materials w
Dos nuevos registros para la flora de musgos de Costa Rica: Steereobryon subulirostrum y Pogonatum pensilvanicum (Polytrichaceae)
Efraín de Luna,María Silvina Ussher Miozzo,Raquel Cobos Acosta
Acta botánica mexicana , 2002,
Abstract: Como resultado de exploraciones durante el Primer Curso de Briología Tropical de la Red Latinoamericana de Botánica, se recolectaron dos especies de Polytrichaceae que son nuevas para la flora de musgos de Costa Rica y América Central: Steereobryon subulirostrum (Schimp. ex Besch.) G. L. Sm. y Pogonatum pensilvanicum (Hedw.) P. Beauv. El primer taxon además representa un género no conocido previamente de Centroamérica. En tal virtud, se proveen claves para la identificación de los géneros de Polytrichaceae y de las especies de Pogonatum de Costa Rica.
Estudio comparativo de características de calidad entre genotipos de frijol de grano negro
Guzmán Tovar, Israel;Almanza Aguilera, Enrique;Acosta Gallegos, Jorge Alberto;Guzmán Maldonado, Salvador Horacio;
Agricultura técnica en México , 2009,
Abstract: the imported black seeded bean type is known in mexico as negro michigan, even after being grown in mexico. the seed traits responsible for the high demand of imported negro michigan that has competitive advantages in the national market are unknown; however. a survey was conducted among merchants and consumers in order to define which traits make the difference between the local black beans and the imported negro michigan. on the other hand, some physical properties, such as seed appearance, cleanliness, seed shape and size, seed color, seed coat content and thickness were recorded on commercial black seeded samples, bred lines and cultivars, as well as imported negro michigan and t3 9 produced in mexico. also data were taken on water sorption capacity, soluble solids and broth thickness. cook bean flavor was important for 41% of consumers. therefore, the physical appearance of the local bean grain must be improved to be able to compete with the imported black bean, and sensorial studies among consumers should be conducted when a new cultivar is going to be registered for commercial production. among the bred lines tested, some displayed similar quality traits as negro michigan and could be registered and increased for commercial production since they are suitable for the national market due to its high quality and proven productivity.
Mucormicosis cutánea en un recién nacido pretérmino: A propósito de un caso
Calabria O,Betty; Acosta A,Náyade; Gallegos L,Luís; Vargas Montiel,Hernán;
Kasmera , 2005,
Abstract: introduction: mucormycosis is a serious infection cause by opportunist fungus, of the mucoral type, and results in high mortality. it is more frequent in immuno-suppressed patients and associated with debilitating diseases. one of the presentation forms is cutaneous. case report: a premature newborn female, with 34 weeks of gestation, was admitted in the intensive care unit with hyaline membrane disease as the only concern. on the fifth day of hospitalization a purple round pointed lesion in the left cheek appeared that became a profound necrosis. treatment began with imipenen, vancomicin, and amikacin, together with surgical debridement. cultures and histo-pathological studies showed non-septate hyphae, and cultures identified rhizopus sp. as soon as the culture results were available, additional treatment with amphotericin b 1.5 mg per kg per day was initiated . the evolution of patient was satisfactory and she was released from the intensive care unit. conclusion: we observed how important the immunological state of the patient is, and treatment must be aggressive, multidisciplinary and always oriented to each individual case.
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.
Page 1 /200630
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.