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Abstract <p>Strawberry, a hybrid fruit crop is threatened by wilt disease incited due to <i>Fusarium oxysporum</i> leading to significant yield loss, up to 40% in the recent decades. Management with soil drenching of fungicide (carbendazim) is a usual and regular practice whereas it causes negative impact on soil, water and environment. Thus, eco-friendly management by using potential biocontrol strains, namely <i>Chaetomium globosum</i> (Cg-6 and Cg-40) and <i>Bacillus subtilis</i> (Bbv-57), were employed for in vitro and in vivo studies. Under in&#xa0;vitro<i>,</i> Cg-6, Cg-40 and Bbv-57 were found to inhibit <i>F</i>. <i>oxysporum</i> by 55.6, 61.9 and 36.7%. In the experiment, activation of secondary metabolites by di-trophic interaction between <i>F</i>. <i>oxysporum</i> and each bio-control organism was confirmed and analyzed by GC-MS. The results showed that the presence of compounds like 3,4-dimethyl-1-dimethylsilyloxycyclohexane, 1,2-15,16-diepoxyhexadecane and cyclohexane in all the di-trophic interaction indicates the enzyme inhibitory, cytotoxic and antimicrobial activities. Further, the efficacy of these three biocontrol agents against the wilt disease was evaluated under field conditions on two different locations (protected and open field conditions). In this connection, liquid formulation of Cg-6, Cg-40 and Bbv-57 was developed and applied as basal (5 mL/kg of farm yard manure, seedling dip (5 mL/L) and soil drenching (5 mL/L) at monthly intervals. The treatments were applied as individual and in combination with vesicular arbuscular mycorrhiza (VAM) which was applied as basal dose. Among the different treatments, combined application of Cg-40 along with VAM as basal in both field trails recorded lesser wilt incidence with increased plant growth traits (plant height, leaves and flowers) and quality fruit yield.</p>

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Secondary Metabolites of Biocontrol Agents and its Exploitation with VAM on the Management of Wilt Disease in Strawberry

  • 期刊论文

  • 发表日期：

    2025年6月15日

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  • I. S. Jothini Varsha,
  • L. Rajendran,
  • G. Karthikeyan,
  • B. Vinothkumar,
  • R. Anandham,
  • K. Saravanakumari

摘要

Abstract

Strawberry, a hybrid fruit crop is threatened by wilt disease incited due to Fusarium oxysporum leading to significant yield loss, up to 40% in the recent decades. Management with soil drenching of fungicide (carbendazim) is a usual and regular practice whereas it causes negative impact on soil, water and environment. Thus, eco-friendly management by using potential biocontrol strains, namely Chaetomium globosum (Cg-6 and Cg-40) and Bacillus subtilis (Bbv-57), were employed for in vitro and in vivo studies. Under in vitro, Cg-6, Cg-40 and Bbv-57 were found to inhibit F. oxysporum by 55.6, 61.9 and 36.7%. In the experiment, activation of secondary metabolites by di-trophic interaction between F. oxysporum and each bio-control organism was confirmed and analyzed by GC-MS. The results showed that the presence of compounds like 3,4-dimethyl-1-dimethylsilyloxycyclohexane, 1,2-15,16-diepoxyhexadecane and cyclohexane in all the di-trophic interaction indicates the enzyme inhibitory, cytotoxic and antimicrobial activities. Further, the efficacy of these three biocontrol agents against the wilt disease was evaluated under field conditions on two different locations (protected and open field conditions). In this connection, liquid formulation of Cg-6, Cg-40 and Bbv-57 was developed and applied as basal (5 mL/kg of farm yard manure, seedling dip (5 mL/L) and soil drenching (5 mL/L) at monthly intervals. The treatments were applied as individual and in combination with vesicular arbuscular mycorrhiza (VAM) which was applied as basal dose. Among the different treatments, combined application of Cg-40 along with VAM as basal in both field trails recorded lesser wilt incidence with increased plant growth traits (plant height, leaves and flowers) and quality fruit yield.