PJB-2025-214
Molecular Characterisation of Halotolerant Plant Growth Promoting Rhizobacteria (PGPR), their Effect Biofertilisant and Phytotherapeutic Alternatives to Chemical Fungicides
kreiri senia
Abstract
The excessive use of chemical fertilizers and are associated with notable environmental dangers, human health, and agricultural sustainability. In parallel, soil salinity is a major abiotic stress that adversely affects plant growth. However, this challenging environment promotes the adaptation and enrichment of beneficial bacterial in the rhizosphere, promoting growth and offering biocontrol named Plant Growth-Promoting Bacteria (PGPB). Therefore, In the present study, we aimed to explore the phytotherapeutic potential of native halotolerant (PGPB), particularly Bacillus spp. isolated from extreme area, as a biocontrol strategy against plant diseasesas. A total of 196 bacterial strains were isolated from highly saline soils (3.7 to 12.9 dS/m) conductivity. Only 20 isolates were exhibited contributed to maintaining redox homeostasis and multiple plant growth-promoting traits, including phosphate solubilisation and indole-3-acetic acid (IAA) production and tested their biocontrol mechanism to limits pathogen growth, chelate iron(siderophore), hydrogen cyanide (HCN) production and evaluate her antifungel activity aganist pathogenis fungis. Amid the screening strains, five selected Bacillus strains which significantly enhanced stress tolerance mechanisms as bio-inoculants to improve plant health and productivity under saline conditions. Molecular identification using 16S rRNA gene sequencing confirmed the presence of several halotolerant Bacillus strains. Moreover, their strong antifungal activity against phytopathogenic fungi highlights their promise as phytotherapeutic alternatives to chemical fungicides. This study demonstrates the dual role of these extremophile Bacillus spp in improving plant health and providing an eco-friendly.
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