Abstract
Juglone (5-hydroxy-1,4-naphthoquinone) is known allelochemical, but its molecular mode of action is not well understood. We found that juglone induced reactive oxygen species production and calcium accumulation. To gain more insight into these cellular responses, we performed large-scale analysis of the rice transcriptome during juglone stress. Exposure to juglone triggered changes in transcript levels of genes related to cell growth, cell wall formation, chemical detoxification, abiotic stress response and epigenesis. The most predominant transcription-factor families were AP2/ERF, HSF, NAC, C2H2, WRKY, MYB and GRAS. Gene expression profiling of juglone-treated rice roots revealed upregulated signaling and biosynthesis of abscisic acid and jasmonic acid and inactivation of gibberellic acid. In addition, juglone upregulated the expression of two calcium-dependent protein kinases (CDPKs), 6 mitogen-activated protein kinase (MAPK) genes and 1 MAPK gene and markedly increased the activities of a CDPK-like kinase and MAPKs. Further characterization of these juglone-responsive genes may be helpful for better understanding the mechanisms of allelochemical tolerance in plants.
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Acknowledgments
This work was supported by research grants from National Science Council (NSC 98-2621-B-006-003-MY3) and a grant from the Ministry of Education, Taiwan (Landmark Project Grant for National Cheng Kung University’s Top-University Project, B024). Agilent DNA microarray assays were performed by the DNA Microarray Core Laboratory at the Institute of Plant and Microbial Biology, Academia Sinica. Expression profile and data mining involved the system provided by the Bioinformatics Core for Genomic Medicine and Biotechnology Development at National Cheng Kung University, supported by a National Science Council grant (NSC 97-3112-B-006 -011).
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Further gene lists of microarray can be seen in the following link (http://cam.bio.ncku.edu.tw/haojen/pub2.htm). Supplementary material 1 (XLSX 142 kb)
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Supplemental Fig. 2. Genes up/down regulated in the overview of under juglone stress on regulation. Supplementary material 3 (PPTX 46 kb)
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Chi, WC., Fu, SF., Huang, TL. et al. Identification of transcriptome profiles and signaling pathways for the allelochemical juglone in rice roots. Plant Mol Biol 77, 591–607 (2011). https://doi.org/10.1007/s11103-011-9841-6
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DOI: https://doi.org/10.1007/s11103-011-9841-6