| Effects of Trichoderma pseudokoningii agents on growth, antioxidant system and control effect against fusarium wilt of cucumber seedlings |
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| DOI：10.7606/j.issn.1000-7601.2022.06.08 |
| Key Words: cucumber Trichoderma pseudokoningii agents Fusarium wilt antioxidant capacity control efficacy |
| Author Name | Affiliation | | MA Guangshu | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | ZHANG Ting | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | LI Runzhe | 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 | | LIAN Hua | College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| Trichoderma pseudokoningii 886 strain with good control effect against cucumber fusarium wilt selected in our previous studies was used in this experiment. The effects of Trichoderma pseudokoningii 886 agents on seedling growth, antioxidant system and control effects against fusarium wilt of cucumber seedlings were evaluated through a pot experiment from May to August 2019. The results showed that application concentrations of Trichoderma pseudokoningii agents effectively improved the control effect of cucumber fusarium wilt, and the treatment of 105 cfu·g-1 was the most effective one, with disease control efficacy of 83.98%. Different application concentrations of Trichoderma pseudokoningii agents effectively improved the plant height, stem diameter, leaf area, root volume, root shoot ratio and strong seedling index of cucumber seedlings compared with CK (application only the pathogen of fusarium wilt). The treatment of 105 cfu·g-1 had the best promoting effect on the morphological formation of cucumber seedlings. Application of Trichoderma pseudokoningii agents increased protective enzymes including catalase activity (CAT), peroxidase activity (POD), superoxide dismutase activity (SOD), ascorbate peroxidase activity (APX), polyphenol oxidase activity (PPO) and proline (Pro) content of cucumber seedlings leaf and decreased relative conductivity and malondialdehyde (MDA) content. The treatment of 105 cfu·g-1 had the best promoting effect on the antioxidant system of cucumber seedlings. Compared with CK, catalase activity (CAT), peroxidase activity (POD), superoxide dismutase activity (SOD), ascorbate peroxidase activity (APX), polyphenol oxidasea activity (PPO) and proline (Pro) content of cucumber seedlings leaf increased 119.96%, 213.75%, 139.29%, 97.53%, 101.15% and 70.38%，and relative conductivity and malondialdehyde content of cucumber seedlings leaf decreased 47.74% and 41.40% at 30 days after sowing. The results showed that Trichoderma pseudokoningii agents in this study increased the ability of antioxidant capacity, promoted the morphological formation of cucumber seedlings, and improved the control efficiency of Fusarium wilt in cucumber. |
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