Biocontrol potential and plant-growth-promoting effects of Bacillus amyloliquefaciens MBI 600 against Fusarium oxysporum f. sp. radicis-lycopersici on tomato

A. Samaras, K. Efthimiou, E. Roumeliotis, G.S. Karaoglanidis
Fusarium oxysporum f. sp. radicis-lycopersici (Forl) is the causal agent of fusarium crown and root rot of tomato, a devastating disease causing extensive yield losses. Plant-growth-promoting rhizobacteria (PGPR) can be potential agents for biological control of plant pathogens. Among them, strains of Bacillus subtilis are well known for their ability to control foliar and soil-borne pathogens. In this study, we investigated the effects of a new Bacillus amyloliquefaciens strain (ΜΒΙ 600) on the growth of tomato and the control of Forl under both in-vitro and in-planta conditions. In the in-vitro experiments, the biological control agent reduced mycelial growth of Forl by 24.1%, while it also showed a weak antagonistic activity (antibiosis-inhibition zone <10mm). Dual applications of B. amyloliquefaciens MBI 600 on tomato seeds before sowing and on young seedlings before transplanting induced significant (PKLEINERDAN0.05) increases in shoot height and root length. Similarly, dual applications of B. amyloliquefaciens MBI 600 resulted in significant (P<0.05) reductions in both disease severity and disease index (%), by 75% compared with untreated control plants.
Samaras, A., Efthimiou, K., Roumeliotis, E. and Karaoglanidis, G.S. (2018). Biocontrol potential and plant-growth-promoting effects of Bacillus amyloliquefaciens MBI 600 against Fusarium oxysporum f. sp. radicis-lycopersici on tomato. Acta Hortic. 1207, 139-146
DOI: 10.17660/ActaHortic.2018.1207.18
https://doi.org/10.17660/ActaHortic.2018.1207.18
biocontrol, disease severity, Forl, PGPR, tomato plants
English

Acta Horticulturae