Abstract
Key message
The inhibitory effect of eugenol on rice germination is mediated by a two-step modulatory process: Eugenol first regulates the antagonism of GA and ABA, followed by activation of catalase activity.
Abstract
The natural monoterpene eugenol has been reported to inhibit preharvest sprouting in rice. However, the inhibitory mechanism remains obscure. In this study, simultaneous monitoring of GA and ABA responses by the in vivo GA and ABA-responsive dual-luciferase reporter system showed that eugenol strongly inhibited the GA response after 6 h of imbibition, whereas eugenol significantly enhanced the ABA response after 12 h of imbibition. Gene expression analysis revealed that eugenol significantly induced the ABA biosynthetic genes OsNCED2, OsNCED3, and OsNCED5, but notably suppressed the ABA catabolic genes OsABA8ox1 and OsABA8ox2. Conversely, eugenol inhibited the GA biosynthetic genes OsGA3ox2 and OsGA20ox4 but significantly induced the GA catabolic genes OsGA2ox1 and OsGA2ox3 during imbibition. OsABI4, the key signaling regulator of ABA and GA antagonism, was notably induced before 12 h and suppressed after 24 h by eugenol. Moreover, eugenol markedly reduced the accumulation of H2O2 in seeds after 36 h of imbibition. Further analysis showed that eugenol strongly induced catalase activity, protein accumulation, and the expression of three catalase genes. Most importantly, mitigation of eugenol-inhibited seed germination was found in the catc mutant. These findings indicate that catalase associated with antagonistic changes of ABA and GA is involved in the sequential regulation of eugenol-inhibited seed germination in rice.
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All data supporting the findings of this study are available within the paper and within its supplementary data published online.
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Acknowledgements
We thank the staff at the phytotron at the College of Bioresources and Agriculture, National Taiwan University for providing the support with facilities.
Funding
This work was supported by the National Science and Technology Council of Taiwan (MOST 108-2313-B-002 -055 -MY3, MOST 111-2311-B-002-013, and MOST 111-2311-B-002-013 -) to CY Hong.
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CCH, CYW, CWW and CYH conceived and designed the experiments. CCH, CYW, MYY, and JZH performed the experiments. CCH, CYW, MYY, CWW and CYH wrote the paper.
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Hu, CC., Wu, CY., Yang, MY. et al. Catalase associated with antagonistic changes of abscisic acid and gibberellin response, biosynthesis and catabolism is involved in eugenol-inhibited seed germination in rice. Plant Cell Rep 43, 10 (2024). https://doi.org/10.1007/s00299-023-03096-5
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DOI: https://doi.org/10.1007/s00299-023-03096-5