Fusarium wilt disease caused by Fusarium oxysporum f.sp. lycopersici (FOL) is a significant disease of tomatoes in Thailand. It can reduce the yield of tomatoes up to 50-80%. Plant Growth Promoting Rhizobacteria (PGPR) can promote plant growth either directly by the improvement of physiological metabolic processes or indirectly by the suppression of various plant diseases. Apart from the PGPR, many other elicitors such as chitosan is a natural biopolymer derived from deacetylation N-acetyl-Dglucosamine sugar of chitin. The objective of this study was to evaluate of Bacillusbased chitosan formulations (BBC) for the control of pathogen fungus FOL on tomatoes. Chitosan formulation as BBC1, BBC2, and BBC3 at different concentration of 800, 1000, 1200 and 2000 μg/ml were tested by dual culture technique. The results showed that BBC1 at a concentration of 800 μg/ml had the most effective inhibited mycelial growth of FOL at 45.14%, significantly higher than positive control (Terraclor Super-X). When applied as foliar treatment together with soil drenching and inoculated with the fungus at 7 days, BBC1 at a concentration 800 μg/ml showed the reduction of fusarium wilt disease at 78.95%, statistically significant compared to distilled water. Moreover, the results of environmental scanning electron microscope (ESEM) analysis showed that the mode of action of BBC1 at a concentration 800 μg/ml could be direct inhibition to growth of FOL by secreting antifungal compounds. These results indicated that the formulation of biocontrol agents as BBC can be applied to control or inhibit the growth of the fusarium wilt pathogen of tomatoes.
Tạp chí: EAI ICCASA 2021 - 10th EAI International Conference on Context-Aware Systems and Applications October 28-29, 2021 Ho Chi Minh City, Vietnam (online)
Tạp chí: 21st ACIS International Semi-Virtual Winter Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD2021-Winter), January 28-30, 2021, Ho Chi Minh City, Vietnam
Tạp chí khoa học Trường Đại học Cần Thơ
Lầu 4, Nhà Điều Hành, Khu II, đường 3/2, P. Xuân Khánh, Q. Ninh Kiều, TP. Cần Thơ
Điện thoại: (0292) 3 872 157; Email: tapchidhct@ctu.edu.vn
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