Comparative study of the chemical composition of ethanol extracts from brown algae and their effects on seedling growth and productivity of soya Glycine max (L.) MERR

A comparative analysis of the chemical composition of brown algae extracts has been performed. It was found that L. cichorioides is characterized by a high content of mannitol, glutaminic acid, and iodine. In the extracts obtained from C. costata , high levels of mineral substances and free amino acids were revealed. Extracts obtained from F. evanescens were rich with proteins and phenol compounds. Extracts obtained from L. japonica were characterized by uniquely high iodine and free amino acid contents, among which glutaminic acid prevailed. All studied extracts were shown to stimulate soy seedling growth and increase its productivity. The strongest stimulatory effect on seedling growth was from the extract obtained from L. japonica in a concentration of 100 μg/ml, whereby the growth of root and stem was increased by 20 and 26%, respectively, compared to the control values. Treatment of seeds with the extract of L. japonica in a concentration of 2 mg/ml led to an increase in productivity by 15.6%. Brown algae extracts can be recommended for agriculture to stimulate growth and prepare seeds for sowing.