Abstract
The relationships of sterase- and lipase-like proteins with three signaling molecules (salicylic acid, jasmonic acid, and ethylene) expressed during plant–pathogen interactions were studied. We isolated two carboxylesterase (AtCXE) genes, AtCXE8 and AtCXE9, from Arabidopsis thaliana. The AtCXE8 and AtCXE9 proteins possess carboxylesterase motifs (-GXSXG-) and catalytic triads (Ser, Asp, and His). We demonstrated that recombinant AtCXE8 and AtCXE9 proteins have both enzymatic activity and specific activity for p-nitrophenyl butyrate (C4) in vitro. Moreover, the enzymatic activity of recombinant AtCXE8 was twofold higher than that of AtCXE9. To gain a better understanding of the endogenous role of the AtCXE8 gene in Arabidopsis, we identified an enhancer trap T-DNA mutant (AtCXE8_KO) and used it to show that the AtCXE8 gene was induced in response to fungal infection. AtCXE8_KO plants were also more susceptible to infections than wild-type Col-0 plants. Moreover, overexpression of the AtCXE8 gene in transgenic Arabidopsis plants led to enhanced disease resistance against B. cinerea. Taken together, our data indicate that AtCXE8 plays a role in promoting resistance to fungal invasion.
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Acknowledgments
We thank the Arabidopsis Biological Research Center, The Arabidopsis Information Resource, and The University of Wisconsin Biotechnology Center for providing Arabidopsis thaliana Col-0, Col-6 ecotypes, ein2-1 mutant, and enhancer trap T-DNA mutants, respectively. We also thank Willem F. Broekaert (Katholieke Universiteit Leuven) for providing A. brassicicola strain IMI169558. This work was supported by the faculty research fund of Sejong University in 2011, the Bio-Industry Technology Development Program of iPET (111057-5), and the National Research Foundation of Korea (NRF) of the Korean government (MEST) (no. 2011-0001105) for S. Lee, and a Korea University Grant for W. Jeon.
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11816_2012_253_MOESM1_ESM.pptx
Supplementary Figure 1. Expression profile of AtCXE8 gene. Microarray expression data was downloaded from Arabidopsis eFP Browser (http://bbc.botany.utoronto.ca/efp/cgi-bin/efpWeb.cgi). The mRNA transcripts levels of AtCXE8 by inoculation of P. infestans. X-axis represents timeseries after P. infestans inoculation. Y-axis represents that mRNA transcripts levels with inoculation of P. infestans compare to those of mock treatment (A). The mRNA transcripts levels of AtCXE8 of one and three hours after application of ACC, Zeatin, IAA, ABA, MJ and GA. X-axis represents all the applied chemicals in this experiment. Y-axis represents that mRNA transcripts levels with application of chemicals compare to those of mock treatment (B). The mRNA transcripts levels of AtCXE8 of one and twelve hours after application of cold, osmotic, salt and heat treatment. X-axis represents all the applied abiotic stressors in this experiment. Y-axis represents that mRNA transcripts levels with application of abiotic stressors compare to those of mock treatment (C). (PPTX 66 kb)
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Lee, S., Hwang, S., Seo, Y.W. et al. Molecular characterization of the AtCXE8 gene, which promotes resistance to Botrytis cinerea infection. Plant Biotechnol Rep 7, 109–119 (2013). https://doi.org/10.1007/s11816-012-0253-0
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DOI: https://doi.org/10.1007/s11816-012-0253-0