Elicitors and defense gene induction in plants with altered lignin compositions
- BioDiscovery Institute and Department of Biological Sciences BioDiscovery Institute University of North Texas Denton TX 76201 USA, BioEnergy Science Center (BESC) Oak Ridge National Laboratory (ORNL) Oak Ridge TN 37830 USA
- Faculty of Biological Sciences Centre for Plant Sciences University of Leeds Leeds LS2 9JT UK
- BioEnergy Science Center (BESC) Oak Ridge National Laboratory (ORNL) Oak Ridge TN 37830 USA, Complex Carbohydrate Research Center (CCRC) University of Georgia Athens GA 30602 USA
- BioDiscovery Institute and Department of Biological Sciences BioDiscovery Institute University of North Texas Denton TX 76201 USA
- BioDiscovery Institute and Department of Biological Sciences BioDiscovery Institute University of North Texas Denton TX 76201 USA, BioEnergy Science Center (BESC) Oak Ridge National Laboratory (ORNL) Oak Ridge TN 37830 USA, Center for Biotechnology Innovation (CBI) Oak Ridge National Laboratory Oak Ridge TN 37830 USA
Summary A reduction in the lignin content in transgenic plants induces the ectopic expression of defense genes, but the importance of altered lignin composition in such phenomena remains unclear. Two Arabidopsis lines with similar lignin contents, but strikingly different lignin compositions, exhibited different quantitative and qualitative transcriptional responses. Plants with lignin composed primarily of guaiacyl units overexpressed genes responsive to oomycete and bacterial pathogen attack, whereas plants with lignin composed primarily of syringyl units expressed a far greater number of defense genes, including some associated with cis ‐jasmone‐mediated responses to aphids; these plants exhibited altered responsiveness to bacterial and aphid inoculation. Several of the defense genes were differentially induced by water‐soluble extracts from cell walls of plants of the two lines. Glycome profiling, fractionation and enzymatic digestion studies indicated that the different lignin compositions led to differential extractability of a range of heterogeneous oligosaccharide epitopes, with elicitor activity originating from different cell wall polymers. Alteration of lignin composition affects interactions with plant cell wall matrix polysaccharides to alter the sequestration of multiple latent defense signal molecules with an impact on biotic stress responses.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1457493
- Journal Information:
- New Phytologist, Journal Name: New Phytologist Vol. 219 Journal Issue: 4; ISSN 0028-646X
- Publisher:
- Wiley-BlackwellCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Web of Science
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