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Chlorophyll Concentration and Morphological Diversity in Corn Lines at Different Vegetative Stages

American Journal of Plant Sciences 2016年第7期7卷 1067-1076页

作者： Mariano Mendoza Elos Gilberto Rodríguez Pérez Francisco Cervantes Ortíz Luis Patricio Guevara Acevedo Enrique Andrio Enríquez Ma. Del Carmen Ojeda Zacarías Isabel Presa Figuereo Sergio Alfredo Rodríguez Herrera josé antonio rangel lucio josé Guadalupe Rivera Reyes Division of Graduate Studies and Research Institute Technologic of Roque Guanajuato Mexico University Autonomous Agrarian of Nuevo León Monterrey México University Autonomous Agrarian antonio Narro Saltillo México

The objective of this study was to assess the chlorophyll content of corn lines at different vegetative stages and the diversity between them. The study was conducted in the experimental field of the Roque Institute of Technology (ITR) located in Roque, Celaya, Guanajuato, Mexico. We used 32 corn lines from CIMMYT and four lines from the breeding program of the ITR. The evaluation was conducted in the spring-summer cycle of 2014 at two planting dates. We used a completely randomized block design with three replications. The experimental unit consisted of two rows of five linear meters with a distance of 0.75 meters between rows. Chlorophyll was measured at six different stages: V6, VT, R3, R4, R5 and MF. The agronomic variables recorded were: PH, CH, LAC, LBC, FF, MF, PM, CC, CL, DC, RC, KR and GY. The results of the analysis of variance showed significant differences between lines, dates and their interaction. On average, 18 lines were found with chlorophyll concentrations above 51 SPAD units in the two environments. This indicated that these materials had a high potential for field performance. Using cluster analysis UPGMA method, we identified seven groups for chlorophyll and eight groups for agronomic characteristics for a breeding program. The groups were associated to the homogeneous characteristics of each variable.

关键词： Chlorophyll Content Phenological Stages Clusters and Corn Lines

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Electrical Resistivity Tomography and TDEM Applied to Hydrogeological Study in TaubatéBasin, Brazil

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International Journal of Geosciences 2018年第2期9卷 119-130页

作者： Rodrigo Corrêa rangel Jorge Luís Porsani Cassiano antonio Bortolozo Luiz Rodrigo Hamada Universidade de Sã o Paulo Instituto de Astronomia Geofísica e Ciências Atmosféricas Departamento de Geofísica S&atilde o Paulo Brazil CEMADEN—National Center for Natural Disaster Monitoring and Alert General Coordination of Research and Development S&atilde o josé dos Campos Brazil

This research applies Electrical Resistivity Tomography (ERT) and Time Domain Electromagnetic Method (TDEM) to study the hydrogeology of the Taubaté basin, which is characterized by half-grabens with about 850 m of maximum sediments thickness. The study area is in Taubaté city, São Paulo State, Brazil, where the Taubaté aquifer is an important water source. The Taubaté Group is the main sedimentary package of the basin;it is formed mainly by shales that form aquicludes, and thin layers of sandstones that form the aquifer. There are 40 groundwater exploration wells in Taubaté city that provide important information. The study purpose is to characterize the geoelectrical stratigraphy of the subsurface to locate the contact between the Quaternary and Tertiary sediments and to identify the Taubaté aquifer. The ERT is used for shallow investigations (tens of meters) and the TDEM can reach a great investigation depth (hundreds of meters). Therefore, these geophysical methods are complementary. The ERT data were acquired with the pole-dipole array with 20 m of electrodes spacing and 400 m length, and the TDEM data with the central-loop array with a 200 × 200 m transmitter loop. The results permit to define the contact between the Quaternary and Tertiary sediments around 15 m depth, the Pindamonhangaba Formation between 15 m and 30 m depth and the Taubate Group between 30 m and 300 m depth. The TDEM method defined the Taubaté Group as a single geoelectric layer because the shale and the sandstone layers are all very conductive. The basement is formed by gneiss, which is a very resistive rock. The TDEM method is not able to identify a high conductor/resistor contrast. Overall, the results are consistent with the known geology and the wells information.

关键词： Electrical Resistivity Tomography (ERT) Time Domain Electromagnetic (TDEM) Hydrogeophysics Taubaté Basin Brazil

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