Respuestas de Baccharis trimera (Less.) a la restricción de agua
DOI:
https://doi.org/10.18378/rvads.v16i3.8360Palabras clave:
Sequía, Planta medicinal, Estrés oxidativo, Bioquímica, ProlinaResumen
El cambio climático puede provocar desequilibrios en las plantas. Baccharis trimera es una especie que se encuentra a menudo en condiciones adversas y tiene propiedades medicinales y agrícolas. Así, el objetivo fue evaluar las respuestas bioquímicas y fisiológicas de esta planta a niveles de restricción de agua (RA). Se identificaron y recolectaron muestras de B. trimera en Erechim - RS y se propagaron en un invernadero. Una vez aclimatados, fueron sometidos a 0, 25, 75 y 100% de RA, determinado según la saturación de agua en el suelo por capilaridad. Después de 30 días de tratamiento, se determinaron las respuestas fisiológicas: crecimiento y biomasa fresca y seca; y respuestas bioquímicas: actividad de las enzimas superóxido dismutasa (SOD), guayacol peroxidasa (GP) y ascorbato peroxidasa (APX), prolina, contenido de peróxido de hidrógeno y proteínas y peroxidación de lípidos. Los datos se sometieron a análisis de regresión y correlación de Pearson. La RA media de 27,37% indujo un aumento en los parámetros fisiológicos evaluados, pero el crecimiento de las raíces se vio afectado en condiciones de RA superiores al 50%. Con el aumento de RA hubo un aumento en la actividad de las enzimas SOD en el parte aérea y de APX en la raíz. En condición de RA baja, se verificó el mantenimiento del contenido de prolina. Por lo tanto, con niveles bajos de RA, alrededor del 27%, B. trimera tiene un aumento en el crecimiento de las raíces y en la biomasa de parte aérea y raíces. La prolina, SOD y APX son una vía de eliminación del estrés generado por la RA en B. trimera.
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