Medium Lethal Dose of Gamma Rays to Induce Mutations in Caribgrass (Eriochloa polystachya Kunth)

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción AnimalLos rayos gamma se pueden utilizar para el mejoramiento genético de las plantas y generar mutaciones que puedan ser útiles. La investigación se realizó con el objetivo de determinar la dosis letal media (DL50) para inducir mutaciones, con radiación gamma, en pasto janeiro (Eriochloa polystachya Kunth). Métodos: Se irradiaron 8 600 estolones de 8 cm de largo con un nudo, cortados de plantas maduras de más de seis meses de edad con dosis de 0; 25; 50; 75 y 100 Gray de rayos gamma Co60. Se evaluó el porcentaje de establecimiento, altura de planta y mortalidad de los estolones. Los datos fueron analizados a través del análisis de regresión lineal probabilística. Resultados: De acuerdo con la variable porcentaje de establecimiento, la DL50, es igual a 52,60 Gy para el genotipo estudiado, con R2 de 57,73. Conclusiones: Se concluye que la dosis media letal para inducir mutaciones en el pasto Janeiro (Eriochloa polystachya Kunth) se obtuvo con 52,60 Gy con R2 de 57,73.Gamma radiation can be used for genetic breeding of plants, and to produce useful mutations. This research was performed in order to determine the medium lethal dose (LD50) of gamma radiation in Caribgrass (Eriochloa polystachya Kunth). Methods: Overall, 8 600 stolons measuring 8 cm long, bearing a node, were cut from mature plants (over six month old), and were radiated with doses of 0, 25, 50, 75, and 100 Gray of gamma rays Co60. The establishment percentage, plant height, and stolon mortality were evaluated. The data were analyzed by probabilistic linear regression analysis. Results: According to variable percentage of establishment, LD50 was equal to 52.60 Gy, in the genotype studied, with an R2 of 57.73. Conclusions: The medium lethal dose to induce mutations of Caribgrass (Eriochloa polystachya Kunth) was achieved with 52.60 Gy

Effect of the faique (Acacia macracantha) on the nutritional value of guinea grass (Panicum maximum Jacq.) in a silvopastoral system

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción AnimalEl objetivo del estudio fue determinar la tasa de crecimiento y calidad nutricional del pasto Guinea (Panicum maximum Jacq) bajo un sistema silvopastoril con el árbol faique (Acacia macracantha). Se evaluaron dos épocas (lluviosa y seca) y tres tratamientos: (1) bajo la copa del árbol joven, (2) bajo la copa del árbol mediano y (3) fuera de la copa del árbol. Los árboles se clasificaron según el diámetro a la altura al pecho. El crecimiento y calidad del pasto se midió por el método de corte y separación y posterior análisis de laboratorio. La tasa de crecimiento osciló de 71.09 a 51.15 kg MS/ha/d, fuera y dentro de la copa de los árboles, respectivamente, en la época lluviosa. La proteína cruda varió de 10.58, 12.79 y 13.88% (época lluviosa) y 8.93, 10.26 y 11.99% (época seca) fuera de la copa del árbol, bajo la copa del árbol joven y bajo la copa del árbol mediano, respectivamente (p<0.05). El contenido de calcio en el pasto fue estadísticamente (p<0.05) superior bajo la copa del árbol mediano (0.23%) que fuera de la copa del árbol (0.20%) en la época lluviosa. El fósforo en el pasto varió significativamente (p<0.05) entre 0.72, 0.83 y 0.91% (época lluviosa) y 0.73, 0.87 y 1.06% (época seca), fuera de la copa de los árboles, bajo la copa del árbol joven y bajo la copa del árbol mediano, respectivamente. El estudio reveló que la presencia de árboles leguminosos (Acacia macracantha) dentro de los potreros mejora la calidad nutricional de la pastura Panicum maximum Jacq.The aim of this study was to determine the growth rate and nutritional quality of Guinea grass (Panicum maximum Jacq) under a silvopastoral system with the faique tree (Acacia macracantha). The evaluation included two seasons (rainy and dry) and three treatments: (1) under the canopy of the young tree, (2) under the canopy of the mediumsize tree, and (3) outside the canopy of the tree. The trees were classified according to the diameter at chest height. The growth and quality of the grass were measured by the method of cutting and separation and subsequent laboratory analysis. The growth rate ranged from 71.09 to 51.15 kg DM/ha/d, outside and inside the tree canopy, respectively, in the rainy season. Crude protein varied from 10.58, 12.79 and 13.88% (rainy season) and 8.93, 10.26 and 11.99% (dry season) outside the tree canopy, under the young tree canopy and under the middle tree canopy respectively (p<0.05). The calcium content in the grass was statistically (p<0.05) higher under the middle tree canopy (0.23%) than outside the tree canopy (0.20%) in the rainy season. The phosphorus in the grass varied significantly (p<0.05) between 0.72, 0.83 and 0.91% (rainy season) and 0.73, 0.87 and 1.06% (dry season), outside the tree canopy, under the canopy of the young tree and under the canopy of the medium tree, respectively. The study revealed that the presence of leguminous trees (Acacia macracantha) within the paddocks improves the nutritional quality of the Panicum maximum Jacq pasture

New CC0\pi\ GENIE Model Tune for MicroBooNE

A novel tune has been made for the MicroBooNE experiment. The fit uses 4 new parameters within the GENIE v3.0.6 Monte Carlo program. Charged current pionless data from the T2K experiment was used. New uncertainties were obtained. These results will be used in future MicroBooNE analyses.Comment: 24 pages, 14 figure

First Measurement of Differential Charged Current Quasielasticlike νμ-Argon Scattering Cross Sections with the MicroBooNE Detector

We report on the first measurement of flux-integrated single differential cross sections for chargedcurrent (CC) muon neutrino (νμ) scattering on argon with a muon and a proton in the final state, 40Ar ðνμ; μpÞX. The measurement was carried out using the Booster Neutrino Beam at Fermi National Accelerator Laboratory and the MicroBooNE liquid argon time projection chamber detector with an exposure of 4.59 × 1019 protons on target. Events are selected to enhance the contribution of CC quasielastic (CCQE) interactions. The data are reported in terms of a total cross section as well as single differential cross sections in final state muon and proton kinematics.We measure the integrated per-nucleus CCQE-like cross section (i.e., for interactions leading to a muon, one proton, and no pions above detection threshold) of ð4.93 0.76stat 1.29sysÞ × 10−38 cm2, in good agreement with theoretical calculations. The single differential cross sections are also in overall good agreement with theoretical predictions, except at very forward muon scattering angles that correspond to low-momentum-transfer events.United States Department of Energy (DOE)National Science Foundation (NSF)Swiss National Science Foundation (SNSF)Science and Technology Facilities Council (STFC), part of the United Kingdom Research and InnovationRoyal Society of LondonAlbert Einstein Center for Fundamental Physics, Bern, SwitzerlandAzrieli FoundationZuckerman STEM Leadership ProgramIsrael Science FoundationVisiting Scholars Award Program of the Universities Research AssociationDE-AC02-07CH1135