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Discovery of β-Carboline Oxadiazole Derivatives as Fungicidal Agents against Rice Sheath Blight
Zhi-Jun Zhang1, Zhi-Yan Jiang1, Qi Zhu1
1Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Key Laboratory of Crop Integrated Pest Management in South China, Ministry of Agriculture , South China Agricultural University , Guangzhou , Guangdong 510642 , People's Republic of China.
Abstract:
A series of β-carboline oxadiazoles were synthesized, and their fungicidal activities and mechanism of action against rice sheath blight caused by Rhizoctonia solani was evaluated. The results showed that all of these compounds exhibited significant in vitro fungicidal activity. Significantly, compound 5i (EC50 = 4.2 μg/mL) displayed the best efficacy and superior fungicidal activity compared to validamycin A (EC50 = 197.6 μg/mL). Moreover, the in vivo test also demonstrated that compound 5i could effectively control rice sheath blight and showed higher in vivo protective and curative activities against R. solani than validamycin A. Preliminary mechanism studies revealed that compound 5i caused the loss of mitochondrial membrane potential, reactive oxygen species accumulation, cell membrane destruction, and DNA synthesis interference. These findings indicated that compound 5i displayed superior fungicidal activities against R. solani and could be a potential fungicidal candidate against rice sheath blight.
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