Journal
BIOLOGICAL CONTROL
Volume 176, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.biocontrol.2022.105088
Keywords
Pelletized compost; Bacillus velezensis CE 100; F; oxysporum f; sp; lycopersici; Tomato Fusarium wilt; Antifungal peptide; Conidial germination inhibition
Categories
Funding
- Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Agricultural Machinery/Equipment Localization Technology Development Program - Ministry of Agriculture, Food and Rural Affairs (MAFRA)
- [321055-5]
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This study investigated the control efficacy of pelletized compost containing a high concentration of the biocontrol agent Bacillus velezensis CE 100 for tomato Fusarium wilt. The results showed that supplementation of soil with CE 100-pelletized compost significantly controlled the disease and promoted tomato growth.
The objective of this study was to determine the control efficacy of pelletized compost containing high number of the biocontrol agent, Bacillus velezensis CE 100, for tomato Fusarium wilt. Pelletizing had no serious effects on the cell numbers and quality of strain CE 100 in producing lytic enzymes although antifungal activities of reisolated strain CE 100 from pellet against Fusarium oxysporum f. sp. lycopersici was slightly reduced compared to the original strain. However, culture filtrates of two B. velezensis CE 100 strains not only induced abnormal mycelial development with pigment reduction but also caused hyphal deformations with swelling and bugling of the fungal pathogen. Moreover, cyclo(prolyl-valyl), an antifungal dipeptide, was isolated from B. velezensis CE 100 culture and identified by HR-ESI-MS and 1D-and 2D-NMR experiments. The dipeptide limited conidial germi-nation of F. oxysporum f. sp. lycopersici in a concentration-dependent pattern. Long incubation period triggered irregular hyphal morphologies with swollen septa and disorganized cell contents in treatments with the dipep-tide. Under in vivo conditions, supplementation of soil with strain CE 100-pelletized compost significantly controlled Fusarium wilt and resulted in the lowest disease incidence rate, consequently promoting tomato growth. The soil amendment with strain CE 100-pelletized compost could be used as a potential approach for a better fungal disease control, promoting sustainable agriculture.
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