A proposal for developing a yellow maize heterotic pattern for the transition zone of méxico. I. method and populations development [Propuesta para integrar un patrón heterótico de maíz de grano amarillo para la zona de transición de méxico. i. método y formación de poblaciones]
Ramirez Diaz J.L.,Instituto Nacional de Investigaciones Nucleares |
Vidal Martinez V.A.V.,Campo Experimental Santiago |
Miramontes A.L.,Instituto Nacional de Investigaciones Nucleares |
Bonaparte M.C.,Instituto Nacional de Investigaciones Nucleares |
And 3 more authors.
Revista Fitotecnia Mexicana | Year: 2013
Maize (Zea mays L.) commercial hybrids for the Mexican transition zone (1900 to 2200 m, altitude) have been developed by combining subtropical x High Valleys germplasm created independently in each zone. However, there is not a combined breeding strategy specific for the transition zone. The objectives of this research were: a) to present a crop breeding strategy for integrating a yellow grain maize heterotic pattern for the transition zone of Mexico, and b) to describe the maize population development for integrating an heterotic pattern for this zone. For the first objective, the strategy includes both breeding methodology and types of hybrids to be generated. For the second objective, diallel crosses among tropical and temperate yellow maize populations were evaluated in six locations of the West-Central region of México. White-grain progenitors were converted to yellow-grain types, and yield trials involving yellow-grain commercial hybrids and yellow-grain half sib families obtained by crosses with high valleys and transition germplasm were established at Tepatitlán, Jal. It was concluded that the proposed methodology for integrating heterotic patterns and improved varieties for the transition zone of México has technically more advantages than the actual method used in the Maize Program at INIFAP. It was confirmed that temperate maize germplasm could contribute importantly in both grain yield and earliness for the transition zone, thus this germplasm was used for the conversion of white-grain line "LPC1A-9R-11"to yellow-grain. Selected half sib families used to integrate "INIFAP-Amarillo Dentado-3" population had similar maturity but more tolerance to lodging and healthy ears than landrace Amarillo Zamorano, the best yellow native maize in the region.
Ledesma-Miramontes A.,Instituto Nacional de Investigaciones Nucleares |
Ramirez-Diaz J.L.,Instituto Nacional de Investigaciones Nucleares |
Vidal-Martinez V.A.,Campo Experimental Santiago Ixcuintla |
Pena-Ramos A.,Campo Experimental Pabellon |
And 3 more authors.
Revista Fitotecnia Mexicana | Year: 2015
In México, reconversion from white to yellow grain maize is a strategic grain production program for the country. The transition zone of México (ZTM), located between 1900 to 2200 m of altitude, is environmentally appropiate for maize production. However, improved, yellow grain maize varieties production is limited. As a strategy for increasing the offer, a heterotic yellow grain maize pattern was identified from a subtropical population (LPC1A RC1 C0 F2), and a tropical high valley's population (INIFAP-Amarillo Dentado-3). This research evaluated the heterotic pattern of the LPC1A RC1 C0 F2 x INIFAP-Amarillo Dentado-3 hybrid, for commercial development of yellow grain maize hybrids for ZTM. We developed test-crosses from S2 lines derived from the INIFAP-Amarillo Dentado-3 population, where population LPC1A RC1 C0 F2 was used as a tester. Testcrosses were evaluated in four locations, three of them located in ZTM, and one more in a subtropical location. The outstanding lines for general combining ability were crossed to two subtropical single crosses, where one progenitor of each cross was derived from the LPC1A RC1 C0 F2 population. Three-way crosses were evaluated in three locations of ZTM. Agronomic data for plant and ear were recorded and used to estimate general and specific combining ability. It was concluded that the yellow grain maize heterotic in pattern LPC1A RC1 C0 F2 x INIFAP-Amarillo Dentado-3 is an alternative for developing maize hybrids for ZTM; some of the test-crosses and hybrids in this research were up to 7 d earlier, and grain yield was statistically equal (P = 0.05) or up to 17 [%] greater than commercial controls.
The landslide in November 2007 and formation of a natural dam on the Grijalva River, Chiapas, Mexico [El deslizamiento de ladera de noviembre 2007 y generación de una presa natural en el río Grijalva, Chiapas, México]
Hinojosa-Corona A.,CICESE |
Rodriguez-Moreno V.M.,Campo Experimental Pabellon |
Munguia-Orozco L.,CICESE |
Boletin de la Sociedad Geologica Mexicana | Year: 2011
On the night of November 4th 2007 a landslide of 48 million cubic meters of rocks and mud with an extension of 80 ha produced a natural barrier to the Grijalva River, one of the largest in Mexico, obstructing its natural flow between the Peñitas (downstream) and Malpaso (upstream) dams and forming a natural barricade 80 m high, 800 m long and 300 m wide. The rural town of San Juan de Grijalva, located on the shoreline of the river, was affected by the moving block and the sudden flooding of a wave generated by the landslide. A death toll of 25 was reported. Assisted with remote sensing and geographic information systems tools, we present the landslide and the Grijalva River watershed in the context of the natural dam and abnormal precipitation during late October and early November 2007. Through high resolution satellite imagery and digital elevation models, a pre-and post-landslide perspective is presented. An airborne Lidar high resolution elevation model was used to analyze the landslide once it occurred. Synthetic stereo pairs were constructed, one previous to the landslide to photo interpret lineaments and one after it to visualize the phenomenon. Plots of transects across pre-and post-landslide elevation models illustrate the magnitude of the landslide. From the Lidar elevation model, a general landslide surface plane was calculated with a slope of 28% and 239 degrees in azimuth. The different factors that could have triggered the landslide are analyzed, without finding an outstanding one. We consider that the cause was a sum of factors with a delayed response of a few days.
Acosta-Diaz E.,Campo Experimental General Teran INIFAP |
Hernandez-Torres I.,Campo Experimental General Teran INIFAP |
Amador-Ramirez M.D.,Campo Experimental Zacatecas |
Padilla-Ramirez J.S.,Campo Experimental Pabellon |
And 2 more authors.
Plant Ecology and Evolution | Year: 2015
Background and aims–The northeastern region of Mexico is recognized for its diversity of wild species of Phaseolus (Fabaceae). However, seed samples for species characterization and ex situ conservation are scarce. This study aimed to (1) determine the growing sites of wild species of Phaseolus in northeastern Mexico, (2) collect seed samples for ex situ conservation, and (3) characterize morphologically the species found in the region. Methods–During 2010–2013, explorations were undertaken in sixteen municipalities in the states of Nuevo Leon and Tamaulipas. Each growing site was geo-referenced, and soil and vegetation characteristics were registered. Seed samples and wild bean plants at flowering stage were collected for taxonomic identification and conservation. Key results–Eleven wild species were found: Phaseolus neglectus Herm., P. leptostachyus Benth. var. leptostachyus, P. pedicellatus Benth., P. altimontanus Freytag and Debouck, P. albiflorus Freytag and Debouck, P. novoleonensis Debouck, P. maculatifolius Freytag and Debouck, P. zimapanensis A. Delgado, P. vulgaris L., P. coccineus L. subsp. coccineus var. splendens Freytag, and P. glabellus Piper. Phaseolus vulgaris exhibited the greatest morphological variation. © 2015 Botanic Garden Meise and Royal Botanical Society of Belgium.
Forage quality and agronomic characterization of annual forage species in north-central Mexico [Caracterización agronómica y nutricional del forraje de variedades de especies anuales en la región norte de México]
Hernandeza G.N.,Campo Experimental La Laguna Instituto Nacional Of Investigaciones Forestales |
Garciab J.A.P.,Universidad Juarez del Estado de Durango |
Ramosc A.P.,Campo Experimental Pabellon |
Castanedac F.G.,Campo Experimental Pabellon |
And 2 more authors.
Tecnica Pecuaria en Mexico | Year: 2010
The objective of this study was to generate knowledge on agronomic and nutritive characteristics of corn, sorghum and winter cereals forage varieties in North-Central Mexico. Three experiments were performed for evaluating: 1) Twenty four (24) corn hybrids planted at 106,000 plants ha-1, fertilized at a 200-80-00 N-P-K rate, and harvested at 1/3 of milk line in grain, 2) Nineteen (19) forage, grain, and brown midrib sorghum varieties seeded at 12 kg ha-1 of commercial seed, fertilized at a 200-60-00 N-P-K rate and harvested at milk grain stage, and 3) Twelve (12) winter cereal varieties seeded at 150 kg ha-1 of commercial seed, fertilized at a 180-80-00 N-P-K rate and harvested at grain dough stage. All three experiments were carried out in a complete randomized block design with four replicates. Variables were: dry matter yield per hectare (DMY), ear percentage (EAR) or panicle percentage (PAN), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), neutral detergent fiber digestibility (NDFD), in vitro dry matter digestibility (DMD), lignin (Lig) and net energy for lactation (NEl). Statistical analyses included variance, descriptive statistics and simple correlation. Corn DMY average and standard deviation were 8.48±2.12 tm ha-1, DMD 71.50±2.18% and NEl 1.52±0.5 Mcal kg-1 DM. NEl was correlated with ear percentage (r=0.60**), NDF concentration (r=-0.64**) and NDFD (r=0.92**). Sorghum average and standard deviation were DMY 18.43±2.19 t/ha, DMD 64.90±4.07%) NEl 1.35±.10 Mcal kg-1 DM and DNDF 44.89±8.63. NEL was correlated with NDFD (r=0.84**). Winter cereal yield was 12.33±1.18 tm ha-1, DMD 71.30±1.99% and NEl 1.50±0.04 Mcal kg-1 DM. NEl was correlated with DNFD (r=0.84).