| Effects of Trichoderma conidia and chlamydospore on cucumber leaf antioxidant system and control efficacy of fusarium wilt in cucumber |
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| DOI：10.7606/j.issn.1000-7601.2021.04.09 |
| Key Words: Trichoderma conidia chlamydospore fusarium wilt antioxidant capacity cucumber |
| Author Name | Affiliation | | LIAN Hua | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | MA Guangshu | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | JIN Yazhong | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | LI Mei | Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | ZHANG Fan | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| Cucumber fusarium wilt is one of the major destructive soil\|borne diseases in cucumber production, and the application of biocontrol fungi to control cucumber wilt has a great significance in cucumber safe production. In this study, the effect of Trichoderma conidia and chlamydospore on antioxidant capacity and control efficacy against fusarium wilt in cucumber through pot culture were evaluated. The three Trichoderma strains were Trichoderma harzianum 809, Trichoderma pseudokoningii 886, and Trichoderma asperellum 525 with anti\|fusarium oxysporum activity. The results showed that the control efficacy of conidia and chlamydospore of three Trichoderma strains against fusarium wilt in cucumber were all above 66.81%, and chlamydospore of T. asperellum 886 was the most effective, with disease control efficacy of 81.46%. Compared with CK (application only the pathogen of fusarium wilt), relative conductivity and malondialdehyde (MDA) content of cucumber seedlings continuously decreased under conidia and chlamydospore of three Trichoderma strains, while protective enzymes including peroxidase activity, catalase activity, ascorbate peroxidase activity and superoxide dismutase activity of cucumber seedlings continuously increased at three leaves and one heart period. Of which chlamydospore of T. asperellum 886 was the most effective. Relative conductivity and malondialdehyde content of cucumber seedlings decreased 47.74% and 41.40% respectively, when compared to CK. Peroxidase activity, catalase activity, ascorbate peroxidase activity and superoxide dismutase activity of cucumber seedlings increased 318.11%, 155.36%, 157.09% and 300.34% respectively compared with CK treatment. The results showed that all three Trichoderma strains in this study improved the ability of antioxidant capacity and protective enzyme activities as well as the control efficacy of fusarium wilt in cucumber. This study provided guidance for efficient use of Trichoderma and safe production of cucumber. |
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