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| Registros recuperados: 1.103 | |
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| González González, Miguel. |
| Para diseñar estrategias de conservación in situ de la diversidad genética del maíz, se requiere de valorar tanto a la diversidad como al potencial para incrementar la producción bajo el esquema de la agricultura tradicional como punto de referencia. Dado que el intercambio de semilla se da principalmente dentro de las comunidades rurales, se consideró al municipio de Ayapango, Edo. de Méx., para colectar las poblaciones de maíz que se manejan en aproximadamente el 20% de los hogares. Se colectaron 97 poblaciones de la raza Chalqueño, y dos de Cacahuacintle. Dentro de Chalqueño hubo poblaciones del tipo de grano cremoso (49), del conocido localmente como Palomo (19), del azul (24), del rojo (4) denominado localmente como “xitocle”, y una población de... |
| Tipo: Tesis |
Palavras-chave: Diversidad genética; Maíz; Chalqueño; Conservación in situ; Isoenzimas; Doctorado; Genética; Genetic diversity; Maize; Chalqueño; In situ conservation; Isozymes. |
| Ano: 2007 |
URL: http://hdl.handle.net/10521/1585 |
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| Gutiérrez Castorena, Edgar Vladimir. |
| A partir de 1994, la Tercera Unidad de Asistencia Técnica del Distrito de Riego No. 026, región noreste del estado de Tamaulipas, fue modificado por un déficit de humedad colocando a la región en una situación de alta vulnerabilidad social, económica, política, cultural y agroecológica. Debido a la complejidad del problema se llevó a cabo una investigación multiescalar desde, el nivel mega-macro hasta el microscópico empleando diferentes metodologías: interpretación de imágenes de satélite, uso de sistemas de información geográfica, creación de bases de datos (90,500 piezas), encuestas directas con productores, análisis físicos, químicos, mineralógicos y micromorfológicos de suelos. Los objetivos que se plantearon fueron: 1) Evaluar el uso de la... |
| Tipo: Tesis |
Palavras-chave: Patrón de cultivo; Maíz; Sorgo; SIG; Cambio de uso de suelo; Clasificación de Suelos; Suelos semi-áridos; Déficit de agua; Percepción remota; Doctorado; Edafología; Maize; Sorghum; GIS; Land use change; Environment adaptation; Crop patterns; Irrigation Districts; Remote sensing. |
| Ano: 2009 |
URL: http://hdl.handle.net/10521/1284 |
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| Alarcón Maldonado, Juan Carlos. |
| CIMMYT (Centro Internacional de Mejoramiento de Maíz y Trigo) tiene datos de calidad sobre los experimentos que se realizan en todos sus centros experimentales, y los procesos de concentración de la información se han afinado notablemente. Sin embargo, el acceso a estos datos está limitado en dos aspectos: sólo se pueden acceder vía una red local, o solicitando el envío de un dispositivo con los datos de interés, y aunque hay algunos informes programados, para obtener algún otro, las demoras son muy considerables. El trabajo de investigación que se documenta en esta tesis de Maestría resultó en el sistema CROPFINDER, que resuelve ambas situaciones. Se creó una base de datos que permite al sistema ofrecer las consultas que necesitan los... |
| Tipo: Tesis |
Palavras-chave: Consultas paramétricas; Maíz; Trigo; Trait; Maestría; Computo Aplicado; Parameterized queries; Maize; Wheat. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1322 |
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| Zimmerer, Karl S.; Department of Geography, Earth and Environmental Systems Institute (EESI), Penn State Institutes for Energy and the Environment (PSIEE); ksz2@psu.edu. |
| I examined agrobiodiversity in smallholder cultural landscapes with the goal of offering new insights into management and policy options for the resilience-based in situ conservation and social-ecological sustainability of local, food-producing crop types, i.e., landraces. I built a general, integrative approach to focus on both land use and livelihood functions of crop landraces in the context of nontraditional, migration-related livelihoods amid global change. The research involved a multimethod, case-study design focused on a cultural landscape of maize, i.e., corn, growing in the Andes of central Bolivia, which is a global hot spot for this crop’s agrobiodiversity. Central questions included the following: (1) What are major agroecological... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Cultural landscapes; Knowledge systems; Maize; Phenology-based adaptive capacity; Social networks of migration. |
| Ano: 2014 |
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| The ability of agroecosystems to provide food ultimately depends on the regulating and supporting ecosystem services that underpin their functioning, such as the regulation of soil quality, water quality, soil erosion, pests, and pollinators. However, there are trade-offs between provisioning and regulating or supporting services, whose nature at the farm and plot scales is poorly understood. We analyzed data at the farm level for two agroecosystems with contrasting objectives in central Mexico: one aimed at staple crop production for self-subsistence and local markets, the other directed to a cash crop for export markets. Bivariate and multivariate trade-offs were analyzed for different crop management strategies (conventional, organic, traditional, crop... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Agroecosystems; Avocado; Ecosystem services; Maize; Mexico; Trade-offs. |
| Ano: 2015 |
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| Yu,Tao; Wang,Zhenhua; Jin,Xiaochun; Liu,Xianjun; Kan,Shuaishuai. |
| Background Head smut of maize, which is caused by Sporisorium reilianum f. sp. zeae (Kühn), is a serious disease in maize. In order to reveal the molecular mechanism of the resistance to head smut in maize, a microarray containing ~ 14,850 probes was used to monitor the gene expression profiles between a disease resistant near isogenic line (NIL) and a highly susceptible inbred line after S. reilianum was injected with an artificial inoculation method. Results Levels of expression for 3,532 genes accounting for 23.8% of the total probes changed after inoculation. Gene Ontology analysis revealed that the differentially expressed genes participated in physiological and biochemical pathways. The Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis... |
| Tipo: Journal article |
Palavras-chave: Differentially expressed genes; Head smut resistance gene; Maize; Microarray. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000500007 |
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| González,Germán Andrés; Pacheco,María Gabriela; Oneto,Cecilia Décima; Etchart,Valeria J; Kandus,Mariana V; Salerno,Juan Carlos; Eyherabide,Guillermo; Presello,Daniel; Lewi,Dalia Marcela. |
| Somatic embryogenesis, which is still the method of choice for tissue culture, regeneration and transformation of maize, is largely considered highly genotype-dependent. The Hi II, a highly embryogenic genotype, has been extensively used in transformation protocols. However, this is not an inbred line; instead, it has a proportion of the undesirable A-188 background, and the progeny segregates for phenotypic characteristics and shows poor agronomic performance. In an effort to identify genotypes that combine a high somatic embryogenic response and good agronomic performance, we evaluated 48 advanced inbred lines developed at INTA. Callus development and somatic embryogenesis capacity were measured in 200 immature embryos per line. Embryogenic capacity [EC... |
| Tipo: Journal article |
Palavras-chave: Callus; Inbred lines; Maize; Molecular markers; Regeneration; Somatic embryogenesis. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100009 |
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| Ma,Yuan-Yuan; Guo,Xiu-Lin; Liu,Bin-Hui; Liu,Zi-Hui; Shao,Hong-Bo. |
| The changes of cell ultra structure as well as Ca2+ homeostasis involved in the drought-induced maize leaf senescence was investigated. Meanwhile, many indicatives of leaf senescence including thiobarbituric acid reactive substance (MDA), electrolyte leakage (EL), and chlorophyll along with soluble proteins were also detected during the process. The Polyethylene glycol6000(PEG6000)-incubated detached leaves showed a slight increase in the MDA content and electrolyte leakage during the first 30 min of our detection, which was corresponded to an unobvious alteration of the cell ultrastructure. Other typical senescence parameters measured in whole leaf exhibited a moderate elevation as well. Thereafter, however, the EL and MDA rose to a large extent, which... |
| Tipo: Journal article |
Palavras-chave: Ca2+ homeostasis; Drought; Leaf senescence; Maize; Organelle ultrastructure; Signal transduction. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300004 |
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| Lopes,Allan R.; Marcolin,Jonatas; Johann,Jerry A.; Boas,Márcio A. Vilas; Schuelter,Adilson R.. |
| ABSTRACT The aim of this study is to identify homogeneous rainfall zones in the winter and summer 1st and 2nd crops, in the state of Paraná, Brazil. The zones were defined by clustering using the expectation-maximization (EM) algorithm to transform seasonal rainfall series. Monthly average rainfall data collected from 157 weather stations for 20 years (1996 to 2015) were employed. The results show that the number of homogeneous zones varied among growing seasons. The summer crop presented two clusters, with rainfall averages of 1489 and 1925 mm; the second crop presented four clusters, with averages of 1849, 1004, 1454, and 1182 mm; and the winter crop had three clusters, with averages of 969, 1498, and 1171 mm. Clustering was a useful instrument to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Data mining; Clusters; Expectation-maximization; Weka; Soybean; Maize; Wheat. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000600707 |
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| Li,Xiaoyu; Chen,Wenjuan; Zhao,Yang; Xiang,Yan; Jiang,Haiyang; Zhu,Suwen; Cheng,Beijiu. |
| Lignin is a major cell wall component of vascular plants that provides mechanical strength and hydrophobicity to vascular vessels. However, the presence of lignin limits the effective use of crop straw in many agroindustrial processes. Here, we generated transgenic maize plants in which the expression of a lignin biosynthetic gene encoding CCoAOMT , a key enzyme involved in the lignin biosynthesis pathway was downregulated by RNA interference (RNAi). RNAi of CCoAOMT led to significantly downregulated expression of this gene in transgenic maize compared with WT plants. These transgenic plants exhibited a 22.4% decrease in Klason lignin content and a 23.3% increase in cellulose content compared with WT plants, which may reflect compensatory regulation of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CCoAOMT; Lignin biosynthesis; Lignin and cellulose content; Maize. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000400013 |
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| Santos,Mateus Figueiredo; Moro,Gustavo Vitti; Aguiar,Aurélio Mendes; Souza Jr.,Cláudio Lopes de. |
| This paper reports the effects of three cycles of reciprocal recurrent selection (RRS) on the means, genetic variances, and on the genetic correlations for several traits in the IG-1 and IG-2 maize (Zea mays L.) populations. Interpopulation full-sib progenies from cycle zero (C0) and from cycle 3 (C3) of RRS were evaluated in two locations. RRS was highly effective to improve the traits according the objectives of the program: grain yield and prolificacy increased significantly, while plant height, ear height, and ear placement decreased significantly. Genetic variances for all traits decreased significantly from C0 to C3, but the genetic correlations did not change consistently across the cycles of selection. The expected responses to the fourth cycle of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Maize; Responses to selection; Genetic variances; Genetic correlations. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500021 |
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| Registros recuperados: 1.103 | |
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