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  ZEITLUPE in the roots of wild tobacco regulates jasmonate-mediated nicotine biosynthesis and resistance to a generalist herbivore

Li, R., Cortés Llorca, L., Schuman, M. C., Wang, Y., Wang, L. L., Joo, Y., et al. (2018). ZEITLUPE in the roots of wild tobacco regulates jasmonate-mediated nicotine biosynthesis and resistance to a generalist herbivore. Plant Physiology, 177(2), 833-846. doi:10.1104/pp.18.00315.

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http://dx.doi.org/10.1104/pp.18.00315 (Publisher version)
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 Creators:
Li, Ran1, Author              
Cortés Llorca, Lucas1, Author              
Schuman, Meredith C.1, Author              
Wang, Yang1, Author              
Wang, Lan Lan1, Author              
Joo, Youngsung1, 2, Author              
Wang, Ming1, 2, Author              
Giddings Vassão, Daniel3, Author              
Baldwin, Ian Thomas1, Author              
Affiliations:
1Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society, ou_24029              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              
3Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society, ou_421893              

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 Abstract: The jasmonate (JA) phytohormone signaling system is an important mediator of plant defense against herbivores. Plants deficient in JA signaling are more susceptible to herbivory as a result of deficiencies in defensive trait expression. Recent studies have implicated the circadian clock in regulating JA-mediated defenses, but the molecular mechanisms linking the clock to JA signaling are unclear. Here we report that wild tobacco (Nicotiana attenuata) plants rendered deficient in the clock component ZEITLUPE (ZTL) by RNA interference (RNAi) have attenuated resistance to the generalist herbivore Spodoptera littoralis. This effect can be attributed in part to reduced concentrations of nicotine, an abundant JA-regulated toxin produced in N. attenuata roots and transported to shoots. RNAi targeting ZTL dramatically affects the root circadian clock and reduces the expression of nicotine biosynthetic genes. Protein-protein interaction experiments demonstrate that ZTL regulates JA signaling by directly interacting with JAZ proteins in a COI1- and JA-Ile-independent manner, thereby regulating a JAZ-MYC2 module that is required for nicotine biosynthesis. Our study reveals new functions for ZTL and proposes a mechanism by which a clock component directly influences JA signaling to regulate plant defense against herbivory.

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 Dates: 2018-04-252018-06-182018-06
 Publication Status: Published in print
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 Identifiers: Other: ITB575
DOI: 10.1104/pp.18.00315
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Title: Plant Physiology
  Other : Plant Physiol.
Source Genre: Journal
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Publ. Info: Bethesda, Md. : American Society of Plant Biologists
Pages: - Volume / Issue: 177 (2) Sequence Number: - Start / End Page: 833 - 846 Identifier: ISSN: 0032-0889
CoNE: https://pure.mpg.de/cone/journals/resource/991042744294438