Control Effect and Physiological Mechanism of Trichoderma viride against Melon Damping-off

doi:10.16409/j.cnki.2095-039x.2024.02.045

Abstract

Abstract: Control effect of Trichoderma viride Tv286 against melon damping-off caused by Rizoctonia solani (Rs) was investigated, and the effects on the growth and physiological characteristics of melon seedlings were also determined. The results showed that the control efficacy of Tv286 on potted melon damping-off was more than 85%, and Tv286 could significantly promote the growth of melon seedlings and improve their physiological activities. The treatment with 10⁶ cfu/g Tv286 in soil had the highest control effect on melon damping-off, and the promotion effect on the growth and physiological activity of seedlings was the strongest. Compared with the pathogen control treatment, the seedling height, stem diameter, leaf area, fresh weight, dry weight, root/shoot ratio and strong seedling index of melon seedlings of T3B treatment were increased by 51.64%, 39.93%, 44.49%, 36.99%, 119.18%, 79.45% and 122.73%, respectively. Total chlorophyll content, root activity, nitrate nitrogen content, nitrate reductase activity, soluble sugar content and soluble protein content in melon leaves were increased by 40.02%, 43.64%, 13.85%, 118.34%, 105.46% and 153.78%, respectively, and root volume, total root absorption area, active root absorption area, percentage of root active absorption area, and root specific surface area were increased by 32.02%, 74.18%, 135.09%, 34.97%, and 31.96%, respectively. The above results indicated that T. viride Tv286 promoted the growth of melon seedlings and increased the resistance to damping-off by improving the physiological characteristics of the seedlings.

Key words: Trichoderma viride Tv286, melon, damping-off, physiological characteristics, control effects

CLC Number:

S476

LIAN Hua, LIU Jingyi, ZHANG Jing, MA Guangshu, JIANG Haiyang, JIANG Xiliang, LI Mei. Control Effect and Physiological Mechanism of Trichoderma viride against Melon Damping-off[J]. Chinese Journal of Biological Control, 2024, 40(4): 905-913.

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