Vaninilaya Umashree’s research while affiliated with Central University of Kerala and other places

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Publications (1)


Enhancing growth and Cadmium remediation in red alga, Gracilaria edulis through silicate intervention Enhancing growth and Cadmium remediation in red alga, Gracilaria edulis through silicate intervention
  • Article

June 2024

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19 Reads

Bioremediation Journal

Vaninilaya Umashree

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This study investigates the potential of silicate to alleviate cadmium (Cd) toxicity in Gracilaria edulis, an agarophyte. Under various culture conditions spanning 21 days, alga was grown in control, Silicate (Si) medium, and different Cd concentrations (100, 200, and 300 mM) with or without Si100 mM and the effect was measured by photosynthesis O 2 evolution , relative growth rate (RGR), biomass, biochemical compositions such as chlorophyll a, phycobilipigments (phycocyanin, allophycocyanin, and phycoerythrin), carbohydrate, protein, lipid peroxidation and Cd accumulation. Cd, a toxic heavy metal, negatively impacts plant and algal growth and metabolism. In contrast, traditionally considered non-essential, Si has growth-promoting properties under various stress conditions. The present study reveals that Si significantly enhances photosynthesis except for Cd300. In Cd100, the photosynthetic O 2 evolution was 0.08 nM s −1 , whereas in Cd100 þ Si, it increased to 0.09 nM s −1. The Cd300 þ Si treatment exhibited a rate of 0.07 nM s −1 , but in Cd300, it was 0.05 nM s-1 on the 9th day of culture, and the rate was proportionately high on the 18 th day of culture. The RGR and biomass significantly improved, particularly when Cd100 was combined with Si. Alga shows a decrease in the chlorophyll a, phycobilin pigments, carbohydrate, and protein content when grown at Cd300 concentration but significantly increased when combined with Si treatment. Alga showed less carbohydrate content (0.30 ± 0.02) at Cd300 mM exposure, of which was increased by adding Si (Cd300 þ Si) to 0.34 ± 0.02 mg g −1 alga fresh wt. Cd uptake by the alga is high at Cd300 but considerably low at Cd100 þ Si and Cd200 þ Si concentrations. Malondialdehyde (MDA) level indicating lipid peroxidation-induced oxidative damage was significantly reduced in Si-treated Cd concentrations compared to heavy metal treatment alone. This study demonstrates that silicate can potentially mitigate the adverse effects of Cd on G. edulis by creating a favorable environment for its growth. Thus, it exhibits promise in alleviating Cd toxicity in G. edulis.