Trichoderma gamsii strain TC959 with comprehensive functions to effectively reduce seedling damping-off and promote growth of pepper by direct and indirect action mechanisms
Hengxu Wang | Hao Hu | Tianyou Zhao | Zhaoqing Zeng | Wenying Zhuang
Several Trichoderma species serve as biocontrol agents in agriculture through their phytopathogen growth inhibition capabilities. However, the antagonistic mechanism of certain strains primarily operates through direct action. This study aims to explore an effective strain with comprehensive capabilities and elucidate its practical viability and action mechanism. Trichoderma gamsii strain TC959, exhibiting robust antagonistic and plant growth-promoting properties, was identified. The strain directly inhibits plant pathogen through the production of secondary metabolites, siderophores, and chitinase/xylanase, while promotes plant growth via indole-3-acetic acid/gibberellin release. Additionally, the strain activates induced systemic resistance by enhancing the chlorophyll a/b ratio and jasmonic acid content in pepper seedlings through root colonization, leading to elevated defense-related gene expression, antioxidant enzyme activity, and indole-3-acetic acid/gibberellin production. These mechanisms collectively enhance disease resistance and promote plant growth. Moreover, TC959 demonstrates superior resistance to oxidation and chemical fungicides, facilitating strain viability maintenance and ensuring healthy pepper seedling development. The study concludes that strain TC959 exhibits significant biocontrol potential and comprehensive functions against pepper damping-off disease, warranting further practical applications.
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