Seaweeds’ carbohydrate polymers as plant growth promoters

Currently, the high food demand led to a mass agriculture practices, whereas crop productivity is one of major concerns for producers. However, intensification use synthetic fertilizers has serious harmful impacts human health and environment. The quest novel natural agricultural products current trend, hence seaweed polysaccharide bioactivity can contribute this pursuit. principal carbohydrates (agar, carrageenan alginate) were extracted chemically characterized from five red seaweeds, namely Gracilaria gracilis (Slender wart weed), Asparagospis armata (Harpoon Calliblepharis jubata (False eyelash Chondracanthus teedei var. lusitanicus Grateloupia turuturu (Devil's tongue weed); three brown seaweeds Colpomenia peregrina (Oyster thief), Sargassum muticum (Wireweed) Undaria pinnatifida (Wakame). Afterwards, it was evaluated impact these sulphated polysaccharides on kale ( Brassica oleracea ) growth. Among polymers tested, iota-carrageenan (from ), kappa/ female gametophyte agar showed positive effect Through quantification uronic acids, appears that polymer chemical structure decisive factor affects plant biostimulant activity.