Plant Signaling & Behavior (Dec 2023)

Quercetin induces pathogen resistance through the increase of salicylic acid biosynthesis in Arabidopsis

  • Jonguk An,
  • Sun Ho Kim,
  • Sunghwa Bahk,
  • Minh Le Anh Pham,
  • Jaemin Park,
  • Zakiyah Ramadany,
  • Jeongwoo Lee,
  • Jong Chan Hong,
  • Woo Sik Chung

DOI
https://doi.org/10.1080/15592324.2023.2270835
Journal volume & issue
Vol. 18, no. 1

Abstract

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Quercetin is a flavonol belonging to the flavonoid group of polyphenols. Quercetin is reported to have a variety of biological functions, including antioxidant, pigment, auxin transport inhibitor and root nodulation factor. Additionally, quercetin is known to be involved in bacterial pathogen resistance in Arabidopsis through the transcriptional increase of pathogenesis-related (PR) genes. However, the molecular mechanisms underlying how quercetin promotes pathogen resistance remain elusive. In this study, we showed that the transcriptional increases of PR genes were achieved by the monomerization and nuclear translocation of nonexpressor of pathogenesis-related proteins 1 (NPR1). Interestingly, salicylic acid (SA) was approximately 2-fold accumulated by the treatment with quercetin. Furthermore, we showed that the increase of SA biosynthesis by quercetin was induced by the transcriptional increases of typical SA biosynthesis-related genes. In conclusion, this study strongly suggests that quercetin induces bacterial pathogen resistance through the increase of SA biosynthesis in Arabidopsis.

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