Author: LINO JEREMÍAS RAMÍREZ PÉREZ

Prohexadiona-ca modifica el fenotipo, niveles de antioxidantes y actividad enzimática en chile jalapeño en invernadero

LINO JEREMÍAS RAMÍREZ PÉREZ (2013)

"La presente investigación se llevó a cabo durante el año 2012 con el objetivo de evaluar los efectos de P-Ca en el fenotipo y en la calidad de frutos en chile jalapeño hibrido Grande cultivado bajo condiciones de invernadero. Cuando las plantas alcanzaron 10 hojas verdaderas se realizó la primera aplicación de P-Ca en forma foliar. Los tratamientos fueron 0, 100, 200 y 300 mg⋅litro-1 de P-Ca; y 15 días después, se realizó una segunda aplicación con las mismas dosis del retardante. Cada tratamiento se combinó con el surfactante líquido éter-nonifenol-polietilenglicol a una dosis de 1ml·litro-1. Las variables evaluadas fueron: Tasa de crecimiento de altura y diámetro de tallo; número de frutos y rendimiento por planta; se determinó el contenido de capsaicina, carotenoides, vitamina C y la actividad enzimática. Los resultados señalan que el P-Ca reduce significativamente la altura y diámetro final de tallo central de las plantas; así como el rendimiento. El P-Ca produjo frutos con incrementos significativos en capsaicina, carotenoides, vitamina C y actividad de catalasa y peroxidasa. Se considera que P-Ca tiene potencial para mejorar la calidad de chile jalapeño hibrido Grande."

The present investigation was conducted in 2012 to evaluate the effects of P-Ca on the phenotype and fruit quality on jalapeño pepper hybrid Grande. When seedlings had reached 10 true leaves, a first P-Ca foliar application was done. The treatments with P-Ca were 0, 100, 200 and 300 mg⋅litro-1; and 15 days later, a second P-Ca application was conducted at the same dosages. Each treatment was combined with the surfactant nonyl phenol polyethylene glycol ether at a dose of 1 ml·liter-1. The variables evaluated were: growth rate of height and stem diameter, number of fruits and yield per plant, content of capsaicin, carotenoids, vitamin C and the enzyme activity. The results show that P-Ca reduces final height and diameter of main stem; as well as yield. The P-Ca provoqued fruits with significative increases in capsaicine, carotenoids, vitamin C and activity in catalase and peroxidase. It is concluded that P-Ca has a potential to improve fruit quality in jalapeño pepper hybrid Grande.

Master thesis

Capsicum annuum L Retardante de crecimiento Antioxidantes CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA

Modelo dinámico de la extracción de nutrientes en un cultivo de pepino bajo invernadero

LINO JEREMÍAS RAMÍREZ PÉREZ (2017)

"La agricultura protegida (AP) puede ser definida como un sistema agrícola especializado en el control del sistema sustrato-microclima, donde es posible modificar condiciones como el sustrato, temperatura, radiación solar, viento, humedad y composición del aire. El principal objetivo de la producción bajo AP es proporcionar condiciones óptimas de microclima para el crecimiento, desarrollo y productividad de las plantas a lo largo del año, y en base a este control lograr las exigencias de calidad, inocuidad y rendimiento que demanda el mercado comercial (Pignata et al., 2017). La producción bajo AP se ha incrementado en todo el mundo, con un estimado de 489,214 ha distribuidos a través de cinco continentes (Hickman, 2017). En México, hay alrededor de 25,814 ha bajo agricultura protegida, donde aproximadamente el 65% son invernaderos y el resto son casas de sombra y macro túneles (SIAP, 2016). La AP proporciona grandes ventajas como inocuidad, calidad y rendimiento de los cultivos, sin embargo, cuando no existe un manejo adecuado, se presenta el uso excesivo de fertilizante (He et al., 2008), el cual en su mayoría es liberado al medio ambiente, provocando impactos ambientales adversos (Gollany et al., 2004; Beman et al., 2005; Marcelis, 2005; Du et al., 2014; Cao et al., 2015). Por lo tanto, es de vital importancia optimizar el uso de los fertilizantes para reducir los riesgos ambientales y mantener los niveles óptimos de rendimientos."

" Due to its benefits, greenhouse production has grown significantly around the world. One of the most highly produced crops under this system is the cucumber. The optimal yield and accumulation of biomass of this vegetable basically depends on the climatic and nutritional conditions during crop development. Therefore, the aim of this study was to determine the influence of climatic variables and mineral absorption levels on cucumber plants under greenhouse conditions. Vitaly and Luxell cucumber varieties were planted in peat moss-perlite substrate (1:1) in a tunnel-type greenhouse. Destructive sampling was performed to determine the dry biomass of each organ of the plant. The concentrations of the nutrient elements N, P, K, Ca, Mg and S in different plant tissues were determined every 10 days. Temperature (to determine the heat units) and radiation measurements were obtained by using instrumentation. The daily water consumption per cucumber plant was assessed to determine the transpiration. The results showed that the climatic variables are significantly correlated with the biomass accumulation and mineral absorption. Low radiation conditions, heat and transpiration units significantly reduced the rate of biomass accumulation and mineral absorption, and consequently, they lowered the cucumber yields."

Doctoral thesis

Pepino Cultivo Invernadero Variedades CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA

Determination of micronutrient uptake in greenhouse cucumber crop using a modeling approach

LINO JEREMÍAS RAMÍREZ PÉREZ AMERICA BERENICE MORALES DIAZ KARIM DE ALBA ROMENUS SUSANA GONZALEZ MORALES ADALBERTO BENAVIDES MENDOZA ANTONIO JUAREZ MALDONADO (2017)

"Control of micronutrients application in cucumber cultivation has great importance as they participate in many functions of metabolism. In addition, micronutrients application efficiency is fundamental to avoid periods of overconsumption or deficit in the crop. In order to determine the micronutrient uptake using a dynamic model, two cycles of Vitaly and Luxell cucumber crops were developed. During the development of the crop, micronutrients content (Fe, B, Mn, Cu and Zn) in the different organs of the cucumber plant was quantified. The model dynamically simulated the accumulation of biomass and micronutrients, using the climatic variables recorded inside the greenhouse as inputs. It was found that a decrease in the photosynthetically active radiation and in the temperature significantly diminishes the accumulation of biomass by cucumber plants. On the other hand, the results demonstrate that the model efficiently simulates both the accumulation of biomass and micronutrients uptake in cucumber crop. The indices used for the evaluation of efficiency showed values higher than 0.95. This dynamic model can be useful to define adequate strategies for the management of cucumber cultivation in greenhouses as well as the application of micronutrients."

Article

Mathematical modeling Cucumis sativus l Micronutrients uptake Simulation CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA