Can species Cedrela fissilis Vell. be used in sites contaminated with toxic aluminum and cadmium metals?

Aluminum (Al) is highly toxic to plants, since it causes stress and inhibits plant growth. Silicon (Si) is known to mitigate the stress caused by Al in several plant species. Thus, the current study aims to investigate the soothing effects of Si on morphophysiological and photosynthetic variables, and the attributes associated with oxidative stress in Schinus terebinthifolius plants exposed to Al. Treatments have followed a completely randomized design, with three repetitions based on the following Al/Si combinations (in mM): Treatment 1: 0 Al + 0 Si; Treatment 2: 0 Al + 2.5 Si; Treatment 3: 1.85 Al + 0 Si; Treatment 4: 1.85 Al + 2.5 Si; Treatment 5: 3.71 Al + 0 Si; Treatment 6: 3.71 Al + 2.5 Si. Each sampling unit consisted of a tray with 15 plants, totaling forty-five per treatment. Shoot and root morphological variables, photosynthetic variables, photosynthetic pigments, hydrogen peroxide concentration, lipid peroxidation (MDA), guaiacol peroxidase (POD) and superoxide dismutase (SOD) enzymes, and non-enzymatic antioxidant such as Ascorbic acid (AsA) and non-protein thiol (NPSH) concentration were assessed. Root growth inhibition followed by changes in root morphological variables have negatively affected root and shoot biomass production in plants only subjected to Al. However, adding 2.5 mM Si to the treatment has mitigated the toxic effects caused by 1.85 mM of aluminum on S. terebinthifolius plants.

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Cadmium toxicity and sensitivity responses in Enterolobium contortisiliquum

Senhor,

Aguilar,

Kuinchtner

et al. 2023

Rev. Caatinga

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Soil contamination with heavy metals brings with it several environmental problems. Among these metals, cadmium (Cd) stands out as an extremely harmful element to plant development and may even cause possible loss or suppression of vegetation in various soils worldwide. Thus, it is necessary to identify tolerant species to reestablish the ecological conditions of the environment. The present study aimed to evaluate Cd tolerance in Enterolobium contortisiliquum seedlings by assessing the effects of Cd on morphophysiological and biochemical variables and determining its potential as a phytoremediator species. The experimental design was completely randomized with four replications. Five Cd concentrations (0, 25, 50, 75, and 100 µmol L-1) were assessed. At the end of the exposure period to the treatments, we measured photosynthetic, morphological (shoot and root dry weight and root morphology), and biochemical (concentration of photosynthetic pigments, hydrogen peroxide content, membrane lipid peroxidation, and guaiacol peroxidase and superoxide dismutase activity) variables in plants. Even with the activation of antioxidant enzymes, cadmium concentrations negatively affected the photosynthetic pigments and photosynthetic rate of Enterolobium contortisiliquum, which reduced biomass production and photosystem functions, evidencing its sensitivity to excess Cd. Based on these characteristics, E. contortisiliquum seedlings can be used as a bioindicator for cadmium-contaminated areas.

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Can species Cedrela fissilis Vell. be used in sites contaminated with toxic aluminum and cadmium metals?

Cited by 4 publications

References 48 publications

Iron(II) sulfate and pH decrease seed germination and seedling growth and alter nutrient and polyamine contents in Cedrela fissilis Vellozo (Meliaceae)

Iron(II) sulfate and pH decrease seed germination and seedling growth and alter nutrient and polyamine contents in Cedrela fissilis Vellozo (Meliaceae)

Silicon as an attenuator of the toxic effects of aluminum in Schinus terebinthifolius plants

Cadmium toxicity and sensitivity responses in Enterolobium contortisiliquum

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