In situ assessment of Jatropha curcas germplasm under tropical dry forest conditions in Manabí-Ecuador

Abstract

Jatropha germplasm accessions need an assessment of their traits to evaluate the nature and magnitude of the genetic variability among accessions. The objective of this research was to evaluate the phenotypic behavior of 130 Jatropha curcas L. (Jatropha) accessions and the genetic variability of selected Jatropha accessions. The selected variables were assessed between 2008-2014 based on the number of fruits per tree (FP), the number of seeds per fruit (SpF), weight of 100 dry seeds (100SW), seed length (SL), seed width (SW), smallest deviation standard as regular seed production (RP), highest deviation standard as irregular seed production (IP), seed oil content (Oil), seed production in g per tree (SP). Correspondence Analysis techniques were also applied in selected elite Jatropha accessions. The genotypic and phenotypic correlation coefficient between seed length, seed width, 100-seed weight and oil content for selected Jatropha accessions were applied. Variance, genotypic and phenotypic coefficients of variation, heritability (broad-sense) and genetic advance were calculated for several Jatropha phenotypic characteristics. CP041, CP052, CP037, CP054, CP060, CP122, CP118, CP120, CP121 INIAP Jatropha accessions were selected basically for SP and FP. A high statistically significant correlation (genotypic and phenotypic) between seed length – seed width was obtained from the chosen Jatropha accessions. Genetic association in the characteristics of growth and production highlighted the low phenotypic diversity in the Jatropha Portoviejo Research Station (EEP) of the National Institute for Agricultural and Cattle Ranching Research (INIAP) germplasm bank. There is an urgent need to improve the germplasm resource by obtaining new accessions, mainly from countries considered as centers of origin of the species.

Explorando el aprendizaje significativo en profesores de educación básica general, Distrito 13D07, provincia de Manabí.

“…Descripción del área de estudio En la Figura 1 se muestra la extensión geográfica del Distrito 13D07 Chone-Flavio Alfaro, que abarca un total de 4,913 km2 en la provincia de Manabí y comprende un total de 387 instituciones del circuito 13D07 (Figura 1). Es importante destacar que el Distrito Chone se encuentra ubicado en un área de Bosque Seco Tropical (Cañadas, 1983), con una precipitación promedio anual de 979 mm y una temperatura media anual de 25.8°C (Cañadas et al, 2020a;Cañadas et al, 2020b;Cañadas et al, 2018a;Rade et al, 2017). Según Martínez-Molina et al ( 2017), estas condiciones climáticas pueden tener un impacto negativo en el aprendizaje de los alumnos y el desempeño de los profesores, debido a un entorno térmico insatisfactorio, un fenómeno que ha sido respaldado por numerosas investigaciones.…”