Amending coral soil using exopolysaccharide from salt-tolerant Bacillus velezensis TSD5 bacteria from an atoll in Vietnam

• DOI: 10.7324/jabb.2025.229116
• Publication Date: 2025-03-18T12:08:33Z
• Authors: Thi Hue Le; Duy Nhan Vu; Thi Hoai Phuong N...; Mai Huong Le; Cong Tinh Nguyen; Thi Tuyen Do; Van Thang Le; Mai Phuong Pham; Dinh Duy Vu
• Keywords: Atoll

Salinity and drought are significant abiotic stresses affecting plant growth productivity. To convert arid saline coral sandy soil in the Vietnamese archipelago into arable land, this study isolated evaluated salinity tolerance exopolysaccharide (EPS) production of Bacillus velezensis TSD5 strain from Vietnam. EPSTSD5 was estimated to have a molecular weight 1.09 × 105Da based on its intrinsic viscosity, with monosaccharide components consisting glucose, rhamnose, mannose (of which is majority). The results FT-IR, EDX, zeta potential analysis showed that contains many hydrophilic negatively charged functional groups, addition having very negative potential, giving it good water-holding capacity (1793%) ability absorb salts cations. Under NaCl stress, EPS significantly stimulated increased polysaccharide protein content, thereby enhancing cellular stress tolerance. Adding or B. sand improved aggregate formation water retention while reducing free salt concentration soil. highlight structural characteristics experiments clearly demonstrate role reduction through capacity, aggregation formation, absorption EPS. These findings provide an important premise for development improve soils as well expand environmental treatment directions.