Fungicidal Property of Curcuma longa L. Rhizome-Derived Curcumin against Phytopathogenic Fungi in a Greenhouse

Abstract

Fungicidal activity of Curcuma longa rhizome-derived materials against Botrytis cineria, Erysiphe graminis, Phytophthora infestans, Puccinia recondita, Pyricularia oryzae, and Rhizoctonia solani was tested using a whole plant method in vivo. It was compared with synthetic fungicides and four commercially available compounds derived from C. longa. The response varied with the tested plant pathogen. At 1000 mg/L, the hexane extract of C. longa showed fungicidal activities against E.graminis, P. infestans, and R. solani, and the ethyl acetate extract of C. longa showed fungicidal activities against B. cineria, P. infestans, Pu. recondita, and R. solani. Curcumin was isolated from the ethyl acetate fraction using chromatographic techniques and showed fungicidal activities against P. infestans, Pu. recondita, and R. solani with 100, 100, and 63% control values at 500 mg/L and 85, 76, and 45% control values at 250 mg/L, respectively. In the test with components derived from C. longa, turmerone exhibited weak activity against E. graminis, but no activity was observed from treatments with borneol, 1,8-cineole, sabinene, and turmerone. In comparison, potent fungicidal activity with chlorothalonil against P. infestans at 50 mg/L and dichlofluanid against B. cinerea at 50 mg/L was exhibited. These results may be an indication of at least one of the fungicidal actions of curcumin derived from C. longa.

Atividade antimicrobiana in vitro do rizoma em pó, dos pigmentos curcuminóides e dos óleos e dos essenciais da Curcuma longa L.

“…Uma fraca atividade antibacteriana foi verificada por Singh et al (2002) e Tönnesen & Karlsen (1987) para a cúrcuma em relação a S. aureus, E. coli, Pseudomonas aeruginosa, S. epidermidis, e Salmonella typhimurium. De acordo com Kim et al (2003), extratos da cúrcuma apresentaram atividade antifúngica in vitro para algumas cepas de Trichophyton e para Botrytis, Erysiphe, Phytophthora, Puccinia, Pyricularia e Rhizoctonia.…”

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“…[128] Hexane extract of C. longa at 1000 mg/L confirmed antifungal effect against Rhizoctonia solani, Phytophthora infestans, and Erysiphe graminis. The study also revealed that 1000 mg/L of ethyl acetate extract of C. longa shown inhibitory effect against R. solani, P. infestans, Puccinia recondita, and Botrytis cinerea.…”

Heterologous Production of Curcuminoids

“…Since then, the biosynthesis and properties of curcumin and other curcuminoids have attracted much interest from the scientific community. Besides antibacterial potential (21)(22)(23), these compounds present several properties that are beneficial to human health (Table 1). Therapeutic properties of curcuminoids have been reviewed in several papers (2,17,18,(24)(25)(26)(27)(28)(29).…”