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- 2022-07-26 (2)
- 2021-11-26 (1)
Hydrogen peroxide reduces sensitivity to aluminum in canola?
¿El peróxido de hidrógeno reduce la sensibilidad al aluminio en la canola?
DOI:
https://doi.org/10.15446/acag.v70n2.94725Palabras clave:
Chlorophyll a fluorescence, Oilseed, Photosynthesis, Stress (en)Clorofila a fluorescencia, Oleaginosas, Fotosíntesis, Estrés (es)
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The objective of this study was to evaluate the effect of aluminum and the mitigating potential of H2O2 on the stress and antioxidant responses in canola (Brassica napus var. oleifera (Moench) Delile) affecting the emergence and initial growth of plants. Canola seeds, cultivar Hyola 61, were treated with different concentrations of H2O2 solution (0.0, 0.075, and 0.15 M), and later sown under different concentrations of aluminum (0.0, 10, 20, and 30 mmolc dm-3). After 20 days of plant emergence, survival and growth characteristics were evaluated. 20, 30, 40, 50, and 60 days after emergence, height, chlorophyll index, chlorophyll a fluorescence, and the activity of superoxide dismutase in the roots were determined. The canola is sensitive to aluminum, and the treatment of seeds with H2O2 0.15 M mitigated the stress caused by the highest dose of aluminum. H2O2 treatment enabled high emergence but did not favor seedling survival or growth. The H2O2 did not increase SOD activity. The chlorophyll a fluorescence characteristics proved the sensitivity of canola to aluminum, but the presence of H2O2 maintained the stability and functionality of photosystem II.
El objetivo de este estudio fue evaluar el efecto del aluminio y el potencial mitigante del H2O2 sobre el estrés y las respuestas antioxidantes en la canola (Brassica napus var. oleifera (Moench) Delile) que afectan la emergencia y el crecimiento inicial de las plantas. Semillas de canola, cultivar Hyola 61, fueron tratadas con diferentes concentraciones de solución H2O2 (0.0, 0.075 y 0.15 M) y posteriormente sembradas bajo diferentes concentraciones de aluminio (0.0, 10, 20 y 30 mmolc dm-3). Después de 20 días de emergencia de la planta, se evaluaron las características de supervivencia y crecimiento. 20, 30, 40, 50 y 60 días después de la emergencia en altura, se determinó el índice de clorofila, la fluorescencia de la clorofila a y la actividad del superóxido dismutasa en las raíces. La canola fue sensible al aluminio y el tratamiento de semillas con H2O2 0.15 M mitigó el estrés causado por la dosis más alta de aluminio. El tratamiento con H2O2 permitió una alta emergencia, pero no favoreció la supervivencia ni el crecimiento de las plántulas. El H2O2 no aumentó la actividad de la SOD. Las variables de fluorescencia de la clorofila a demostraron la sensibilidad de la canola al aluminio, pero la presencia de H2O2 mantuvo la estabilidad y funcionalidad del fotosistema II.
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