Abstract:To study the effectiveness of various chitosan composites on the stabilization of Cr 6+ in contaminated soils and growth characteristics of the marigold plant, a factorial pot trial with completely randomized design and three replications was performed in controlled conditions. The experimental treatments were: the contamination levels of soil to Cr (0, 20, 60 and 180 mg/kg) and adsorbent types (pure chitosan, biochar, zeolite and manganese dioxide, composites of chitosan-biochar, chitosan-zeolite, chitosan-ma… Show more
“…CS-NPs have large surface areas, high degree of deacetylation, and large pore volumes, which make them effective in adsorbing HMs [60,86]. Additionally, CS-NPs have reactive functional groups (e.g., C2-NH 2 , C3-OH, C6-OH) that adsorb heavy metals and reduce plant uptake [52,67,87,88].…”
An excessive amount of chromium in soil has detrimental effects on plant processes, and impairs food security, and public health. The application of nanoparticles may be a suitable solution and an innovative strategy by which to reduce plant abiotic stresses and pollution in the agricultural ecosystems. This research focuses on the effects of chitosan nanoparticles (CS-NPs) on thyme (Thymus vulgaris L.) plants grown in Cr-contaminated soil. The effects of CS-NPs as a soil amendment at four concentrations were investigated on plant nutrient uptake, photosynthesis parameters, antioxidant system, and essential oil (EO) content under soil Cr stress. The results show that chromium stress reduced fresh and dry weight of shoots, the uptake of macro-, and micro-elements, chlorophyll and carotenoids. The application of CS-NPs improved the antioxidant enzyme activity, reduced malondialdehyde, and increased the content of nutrients, EOs, photosynthetic pigments, and chlorophyll fluorescence parameters. The intermediate dose of chitosan nanoparticles (0.1% w/v) best valorized the content and yield of thyme EOs under chromium stress. These results are indicative that the application of CS-NPs can represent a supportive approach for plant production in soils contaminated with heavy metals.
“…CS-NPs have large surface areas, high degree of deacetylation, and large pore volumes, which make them effective in adsorbing HMs [60,86]. Additionally, CS-NPs have reactive functional groups (e.g., C2-NH 2 , C3-OH, C6-OH) that adsorb heavy metals and reduce plant uptake [52,67,87,88].…”
An excessive amount of chromium in soil has detrimental effects on plant processes, and impairs food security, and public health. The application of nanoparticles may be a suitable solution and an innovative strategy by which to reduce plant abiotic stresses and pollution in the agricultural ecosystems. This research focuses on the effects of chitosan nanoparticles (CS-NPs) on thyme (Thymus vulgaris L.) plants grown in Cr-contaminated soil. The effects of CS-NPs as a soil amendment at four concentrations were investigated on plant nutrient uptake, photosynthesis parameters, antioxidant system, and essential oil (EO) content under soil Cr stress. The results show that chromium stress reduced fresh and dry weight of shoots, the uptake of macro-, and micro-elements, chlorophyll and carotenoids. The application of CS-NPs improved the antioxidant enzyme activity, reduced malondialdehyde, and increased the content of nutrients, EOs, photosynthetic pigments, and chlorophyll fluorescence parameters. The intermediate dose of chitosan nanoparticles (0.1% w/v) best valorized the content and yield of thyme EOs under chromium stress. These results are indicative that the application of CS-NPs can represent a supportive approach for plant production in soils contaminated with heavy metals.
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