Abstract
In Catharanthus roseus cell suspensions, expression of several terpenoid indole alkaloid (TIA) biosynthetic genes, including those encoding strictosidine synthase and tryptophan decarboxylase, is coordinately induced by fungal elicitors such as yeast extract (YE). This induction is mediated by several signaling steps including the biosynthesis of jasmonic acid, and the activation of the jasmonic acid-responsive ORCA transcription factors. We investigated a possible role of reactive oxygen species (ROS) as a second messenger in this system. YE was shown to activate the production of ROS, which was dependent on protein phosphorylation and calcium in.ux. However, ROS generation was neither necessary for the induction of genes involved in TIA biosynthesis by YE nor by itself su.cient to induce these genes. Therefore, we conclude that activation of the oxidative burst by YE occurs independently of the activation of genes involved in TIA biosynthesis.
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Abbreviations
- DCFH-DA:
-
dichlorodihydrofluorescein diacetate
- DPI:
-
diphenylene iodonium
- JA:
-
jasmonic acid
- MeJA:
-
methyljasmonate
- NAC:
-
N-acetyl-L-cysteine
- ORCA:
-
octadecanoid-responsive Catharanthus AP2-domain
- ROS:
-
reactive oxygen species
- STR:
-
strictosidine synthase
- TDC:
-
tryptophan decarboxylase
- TIA:
-
terpenoid indole alkaloid
- YE:
-
yeast elicitor
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Pauw, B., van Duijn, B., Kijne, J.W. et al. Activation of the oxidative burst by yeast elicitor in Catharanthus roseus cells occurs independently of the activation of genes involved in alkaloid biosynthesis. Plant Mol Biol 55, 797–805 (2004). https://doi.org/10.1007/s11103-005-1968-x
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DOI: https://doi.org/10.1007/s11103-005-1968-x