Plant Growth-Promoting Activity of <i>Pseudomonas aeruginosa</i> FG106 and Its Ability to Act as a Biocontrol Agent against Potato, Tomato and Taro Pathogens
Farideh Ghadamgahi,
Saeed Tarighi,
Parissa Taheri,
Ganapathi Varma Saripella,
Alice Anzalone,
Pruthvi Balachandra Kalyandurg,
Vittoria Catara,
Rodomiro Ortiz,
Ramesh Raju Vetukuri
Affiliations
Farideh Ghadamgahi
Department of Plant Protection, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
Saeed Tarighi
Department of Plant Protection, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
Parissa Taheri
Department of Plant Protection, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
Ganapathi Varma Saripella
Department of Plant Breeding, Swedish University of Agricultural Sciences, Alnarp, SE-234 22 Lomma, Sweden
Alice Anzalone
Department of Agriculture, Food and Environment, University of Catania, 95124 Catania, Italy
Pruthvi Balachandra Kalyandurg
Department of Plant Breeding, Swedish University of Agricultural Sciences, Alnarp, SE-234 22 Lomma, Sweden
Vittoria Catara
Department of Agriculture, Food and Environment, University of Catania, 95124 Catania, Italy
Rodomiro Ortiz
Department of Plant Breeding, Swedish University of Agricultural Sciences, Alnarp, SE-234 22 Lomma, Sweden
Ramesh Raju Vetukuri
Department of Plant Breeding, Swedish University of Agricultural Sciences, Alnarp, SE-234 22 Lomma, Sweden
P. aeruginosa strain FG106 was isolated from the rhizosphere of tomato plants and identified through morphological analysis, 16S rRNA gene sequencing, and whole-genome sequencing. In vitro and in vivo experiments demonstrated that this strain could control several pathogens on tomato, potato, taro, and strawberry. Volatile and non-volatile metabolites produced by the strain are known to adversely affect the tested pathogens. FG106 showed clear antagonism against Alternaria alternata, Botrytis cinerea, Clavibacter michiganensis subsp. michiganensis, Phytophthora colocasiae, P. infestans, Rhizoctonia solani, and Xanthomonas euvesicatoria pv. perforans. FG106 produced proteases and lipases while also inducing high phosphate solubilization, producing siderophores, ammonia, indole acetic acid (IAA), and hydrogen cyanide (HCN) and forming biofilms that promote plant growth and facilitate biocontrol. Genome mining approaches showed that this strain harbors genes related to biocontrol and growth promotion. These results suggest that this bacterial strain provides good protection against pathogens of several agriculturally important plants via direct and indirect modes of action and could thus be a valuable bio-control agent.
