期刊
NEW PHYTOLOGIST
卷 219, 期 4, 页码 1235-1251出版社
WILEY
DOI: 10.1111/nph.15258
关键词
Arabidopsis thaliana; cell wall remodeling; damage-associated molecular patterns; defense response genes; genetic modification; glycome profiling; lignin composition
资金
- BioEnergy Science Center
- Center for Biotechnology Innovation (Oak Ridge National Laboratory), US Department of Energy (DOE) Bioenergy Research Centers by the Office of Biological and Environmental Research in the DOE Office of Science
- University of North Texas
- European Community [PIEF-GA-2013-625270]
- National Science Foundation Plant Genome Program [DBI-0421683, IOS-0923992]
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.
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