Germination of rice seeds a diferentes temperaturas

The research was developed in the Base Scientific Science Unit, Los Palacios, Pinar del Rio, belonging to the National Institute of Agricultural Sciences. The objective was to evaluate the influence of temperatures on the germination of four rice cultivars. Seeds of Oryza sativa L. (rice) were analyzed from the cultivars, INCA LP-5, Reforma, INCA LP-2 y Jucarito 104 (J-104). The germination temperatures considered in each trial were 10, 15, 20, 25, 30, 35 and 40 [degrees]C. The experimental design used in all cases was completely randomized, each trial was evaluated individually and was repeated twice, we worked with the means of these repetitions. Germinated seeds were counted from their establishment until stabilization, with the data obtained was determined: Percentage of germination, seeds germinated per day and the Maguire Index. The results were subjected to an analysis of variance (ANOVA) with a confidence level of 95 %. The results of this work indicate that there is a sensitivity in the germination process of different rice cultivars to temperature effects. Each cultivar shows a greater or lesser germination resistance depending on the temperature. Therefore, temperature effect in the process is closely related to the genetic material with which it is working. In addition, with a germination speed increase in the increase in temperature, an optimal value is reached and then decreases, regardless of the cultivar. Key words: cereal, vigor, reserve. La investigacion se desarrollo en la Unidad Cientifico Tecnologica de Base, Los Palacios, Pinar del Rio, perteneciente al Instituto Nacional de Ciencias Agricolas. El objetivo fue evaluar la influencia de las temperaturas en la germinacion de cuatro cultivares de arroz. Se analizaron semillas de Oryza sativa L. (arroz) de los cultivares INCA LP-5, Reforma, INCA LP-2 y Jucarito 104 (J-104). Las temperaturas de germinacion consideradas en cada ensayo fueron 10, 15, 20, 25, 30, 35 y 40[degrees]C. El diseno experimental utilizado en todos los casos fue completamente aleatorizado, cada ensayo fue evaluado individualmente y repetido dos veces, se trabajo con las medias de dichas repeticiones. Se contaron las semillas germinadas desde su establecimiento hasta la estabilizacion, con los datos obtenidos se determino: porcentaje de germinacion, semillas germinadas por dia, Indice Maguire (IM) y numero medio de dias germinados (NMDG). Los resultados fueron sometidos a un analisis de varianza (ANOVA) con un nivel de