Evaluación de la fitotoxicidad del cadmio sobre los manglares laguncularia, racemosa, variedad racemosa y la variedad glabriflora emblemática de Guayaquil
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2021-10
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
Laguncularia racemosa es una especie de mangle que cuenta con dos variedades var. racemosa y var, glabrafloru. Ambas variedades se encuentran dentro del Estero Salado, cuerpo hidrico reconocido por su alta contaminación, var. glabriflora es considerada emblemática de Guayaquil y es un taxón catalogado como vulnerable debido a la pérdida de su hábitat., por lo que el objetivo del presente estudio es evaluar la fitotoxicidad del Cd en la germinación y crecimiento de ambas variedades s para determinar cuál de las dos es la más afectada. Con este fin, se expusieron semillas de ambas variedades a diferentes concentraciones de Cd (0.25, 0.5, 1, 2, 4 y 8 mg/L) durante 21 dias y se calcularon variables como tasa de germinación (TG), porcentaje de germinación final (PG), tiempo (TMG) y velocidad media de germinación (VMG). longitud de radiculas e hipocotilos, porcentaje de inhibición de crecimiento e indice integral de fitotoxicidad (IIFT). En ambas variedades las variables PG, TMG y VMG no se vieron afectadas por el Cd. Del mismo modo, el Cd no afectó al crecimiento de hipocotilos en ambas variedades. Sin embargo, este contaminante afectó significativamente el crecimiento de radiculas en var, glabriflora alcanzando valores de 8.32+1.59.9.42-2.72 y 6 22+0.13 mm a concentraciones de 2, 4 y 8 mg/L de Cd. La variedad racemosa presentó una alta tolerancia al Cd a bajas concentraciones de 0 25 y 0,5 mg L. mientras que var. glabriflora fue notoriamente más afectada a concentraciones de 2, 4 y 8 mg/L. Por lo que estos resultados confirman la hipótesis planteada.
Lagamenkaria racemosa, the white mangrove, has two varieties var. racemosa and var. glabriflora Both of them are found in the Estero Salado, a water body recognized for its high contamination. var glabriflora is considered emblematie of Guayaquil and is a taxon classified as vulnerable due to the loss of its habitat, the objective of this study is to evaluate the phytotoxicity of Cd in the germination and growth of both varieties to determine which of the two it is the most affected To this end, seeds of both varieties were exposed to different concentrations of Cd (0.25, 0.5, 1, 2, 4 and 8 mg/L for 21 days, to determinate variables such as Germination Rate (GR), Germination Percentage (GP) time and mean germination speed, radicle and hypocotyl length, growth inhibition percentage and Integral Index of Phytotoxicity (IP). In both varieties PG, TMG and VMG were not affected by Cd. Similarly, Cd did not affect the growth of hypocotyls in both varieties. However, this contaminant significantly affected radicle growth in var glabriflora reaching values of 8 32 + 159.942 2 72 and 622013 mm at concentrations of 2, 4 and 8 mg /E of Cd. The nacem variety presented a high tolerance to Cd at low concentrations of 0.25 and 0.5 mg L. while wan ahrifiora was notoriously more affected at concentrations of 2, 4 and 8 mg L Therefore, thase results confirm the hypothesis raised
Lagamenkaria racemosa, the white mangrove, has two varieties var. racemosa and var. glabriflora Both of them are found in the Estero Salado, a water body recognized for its high contamination. var glabriflora is considered emblematie of Guayaquil and is a taxon classified as vulnerable due to the loss of its habitat, the objective of this study is to evaluate the phytotoxicity of Cd in the germination and growth of both varieties to determine which of the two it is the most affected To this end, seeds of both varieties were exposed to different concentrations of Cd (0.25, 0.5, 1, 2, 4 and 8 mg/L for 21 days, to determinate variables such as Germination Rate (GR), Germination Percentage (GP) time and mean germination speed, radicle and hypocotyl length, growth inhibition percentage and Integral Index of Phytotoxicity (IP). In both varieties PG, TMG and VMG were not affected by Cd. Similarly, Cd did not affect the growth of hypocotyls in both varieties. However, this contaminant significantly affected radicle growth in var glabriflora reaching values of 8 32 + 159.942 2 72 and 622013 mm at concentrations of 2, 4 and 8 mg /E of Cd. The nacem variety presented a high tolerance to Cd at low concentrations of 0.25 and 0.5 mg L. while wan ahrifiora was notoriously more affected at concentrations of 2, 4 and 8 mg L Therefore, thase results confirm the hypothesis raised
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LAGUNEULARIA RACEMOSA VAR. RACEMOSA, LAGUNCULARIA RACEMOSA VAR GLABRIFLORA, INDICE INTEGRAL DE FITOTOXICIDAD, RADICULAS