Seaweed effects on plant growth and environmental remediation: a review

Abstract

Seaweeds are plants found in sea that have tremendous applications in the fields of agriculture and environment. It comprises of three giant classes with a large number of different species. their ability to adopt to various conditions qualifies them more applicable to various environmental and agricultural arena. Agriculturally, both three classes Phaeophyta, Rhodophyta and Chlorophyta, have significant roles in promoting plant growth and productivity and soil protection as well as reclamation with class Phaeophyta has highest contribution due to its alginic acid content and other multifaceted components that are higher followed by Rhodophyta and Chlorophyta. Seaweed (living or dead biomass) has ability to phycoremediate environment against heavy toxic metals and lessen the excessiveness of non-metal inorganic elements via physisorption, chemisorption with the aid of binding sites provided by proteins and carbohydrates functional groups existing in their cell walls and secretion of organic acids and intracellular transformation and accumulation. Seaweed is an important factor in environmental remediation and soil restoration processes.

Enhancing the Growth Performance, Cellular Structure, and Rubisco Gene Expression of Cadmium Treated Brassica chinensis Using Sargassum polycystum and Spirulina platensis Extracts

“…S. platensis was utilized for Cd and Ni adsorption and Cu ion absorption from aqueous solutions [49]. Four biomass types with different biochemical compositions of Arthrospira (Spirulina) platensis were utilized for the removal of heavy metals [83]. The utilization of Sargassum stolonifolium in reducing Cd content in Brassica chinensis has been reported in previous studies.…”

Role of biostimulants in mitigating the effects of climate change on crop performance

“…Upregulation of droughtresponsive genes in soybean (Shukla et al, 2018), coldresponse genes such as COR15A, RD29A, and CBF3 in Arabidopsis thaliana, and downregulation of two chlorophyllase genes AtCHL1 and AtCHL2 have been reported in Arabidopsis thaliana (Stirk et al, 2020). The emerging trend of using SWE in the conditioning soil profile to augment beneficial microbes and plant nutrient amelioration to accelerate stress tolerance is well-proven in sustainable agricultural production (Abdullahi et al, 2021;Ali et al, 2021). Thus, wide application of SWE in the crop production system is highly recommended to induce plant metabolism to combat adverse environmental threats.…”

Bioponics as a Promising Approach to Sustainable Agriculture: A Review of the Main Methods for Producing Organic Nutrient Solution for Hydroponics

“…Algae have also been used for many years in coastal regions as organic fertilizer, representing a good source of nutrients in organic form (0.3-17.5% N, 0.1-4.5% P, 0.1-8.5% K; Table 1), plant growth regulators such as gibberellin, auxin and cytokinin-like substances, and vitamins and amino acids for plants [50,[62][63][64][65]. Notably, marine macroalgae or seaweeds, are used as biostimulants, including in hydroponics, usually in the form of compost made with other organic waste, dried powder and/or liquid extracts [46][47][48]50,[63][64][65][66].…”