Abstract
Jasmonates and nitric oxide (NO) play important roles in the regulation of the signaling network leading to the biosynthesis of plant secondary metabolites. In this work, we explore the effect of constitutive overexpression of CrORCA3 (octadecanoid-responsive Catharanthus AP2/ERF domain), methyl jasmonate (MeJA), and sodium nitroprusside (SNP) on the differentiated tissue of Catharanthus roseus hairy roots. The changes in catharanthine concentration and in the levels of mRNA transcripts of pathway genes and regulators were tracked for 192 h. ORCA3 overexpression led to a slight decrease of the accumulation of catharanthine, while MeJA treatment caused a large increase in the levels of transcripts of pathway genes and the catharanthine concentration. SNP treatment alone or SNP in combination with MeJA treatment caused a dramatic decrease of the cathanranthine concentration, while at the same time the levels of transcripts of zinc finger-binding proteins genes (ZCTs) increased. The latter treatment also caused a decrease of the levels of transcripts of type-I protein prenyltransferase gene (PGGT-I). This response of transcriptional repressors and pathway genes may explain the antagonistic effects of NO and MeJA on catharanthine biosynthesis in C. roseus hairy roots.
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Acknowledgements
We thank Pang Jun-Feng for technical assistance in RNA extraction and Du Hai for his help in work discussion. We are also grateful to Dr. A.A.N. van Brussel and K. Miettinen (Plant Cell Physiology, Institute of Biology, Leiden University, The Netherlands) for proofreading the manuscript. This work was supported by the National Key Project for Research on Transgenic Biology in China (2008ZX08005-004, 2009ZX08009055B, and 2009ZX08005-004B).
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Zhou, ML., Zhu, XM., Shao, JR. et al. Transcriptional response of the catharanthine biosynthesis pathway to methyl jasmonate/nitric oxide elicitation in Catharanthus roseus hairy root culture. Appl Microbiol Biotechnol 88, 737–750 (2010). https://doi.org/10.1007/s00253-010-2822-x
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DOI: https://doi.org/10.1007/s00253-010-2822-x