Volatilized myrcene inhibits growth and activates defense responses in rice roots

Yu Chywan Hsiung, Yun An Chen, Shao Yen Chen, Wen Chang Chi, Ruey Hua Lee, Tzen Yuh Chiang, Hao Jen Huang

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We aimed to analyze the phytotoxic effect of the allelopathic volatile myrcene on rice seedlings, particularly root growth, reactive oxygen species (ROS) generation, and activity of antioxidant enzymes and defense-related genes. Myrcene inhibited the growth of rice seedlings. The activity of ROS and lipoxygenase (LOX) was significantly increased with increasing myrcene concentration in roots and that of antioxidant enzymes was altered dose-dependently. The activity of superoxide dismutase and peroxidase was changed at 24 h after myrcene treatment in rice roots. Furthermore, the mRNA expression of three mitogen-activated protein kinase genes (OsMPK2, 3, and 4), WRKY transcription factor gene (OsWRKY71), LOX gene (OsLOX3), pathogenesis-related protein 1b gene (OsPR1b) and cyclin-dependent protein kinase inhibitor (OsCKI) was upregulated and that of cyclin genes OsCycA1;1, OsCycB1;1 and OsCycD1;1 was downregulated with myrcene treatment in rice roots. These results may provide new insights into the molecular basis of the allelopathic volatile response in plants.

Original languageEnglish
Pages (from-to)2475-2482
Number of pages8
JournalActa Physiologiae Plantarum
Issue number8
Publication statusPublished - 2013 Aug

All Science Journal Classification (ASJC) codes

  • Physiology
  • Agronomy and Crop Science
  • Plant Science


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