Thiadiazole carboxylic acid moiety of tiadinil, SV-03, induces systemic acquired resistance in tobacco without salicylic acid accumulation

Michiko Yasuda; Miyuki Kusajima; Masami Nakajima; Katsumi Akutsu; Toshiaki Kudo; Shigeo Yoshida; Hideo Nakashita

doi:10.1584/jpestics.31.329

Original Articles

Thiadiazole carboxylic acid moiety of tiadinil, SV-03, induces systemic acquired resistance in tobacco without salicylic acid accumulation

Michiko Yasuda, Miyuki Kusajima, Masami Nakajima, Katsumi Akutsu, Toshiaki Kudo, Shigeo Yoshida, Hideo Nakashita

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Keywords: systemic acquired resistance (SAR), salicylic acid, tobacco, disease resistance

JOURNAL FREE ACCESS

2006 Volume 31 Issue 3 Pages 329-334

DOI https://doi.org/10.1584/jpestics.31.329

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Abstract

Systemic acquired resistance (SAR) is a potent innate immunity system in plants that is effective against a broad range of pathogens and induced through the salicylic acid (SA)-mediated pathway. Here we have characterized the SAR induction activity of 4-methyl-1,2,3-thiadiazole-5-carboxylic acid (SV-03) identified as a metabolite of tiadinil in rice. Soil drench application of SV-03 induces a broad range of disease resistance and PR gene expression in tobacco. Further analyses using NahG transgenic tobacco plants indicate that SV-03-induced resistance enhancement does not require SA. Therefore, it is suggested that SV-03 induced SAR by triggering signaling at the same level as or downstream of SA accumulation.

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