Arabidopsis Dehiscence Zone Polygalacturonase 1 (ADPG1) releases latent defense signals in stems with reduced lignin content

Gallego-Giraldo, Lina; Liu, Chang; Pose-Albacete, Sara; Pattathil, Sivakumar; Peralta, Angelo Gabriel; Young, Jenna; Westpheling, Jan; Hahn, Michael G.; Rao, Xiaolan; Knox, J. Paul; De Meester, Barbara; Boerjan, Wout; Dixon, Richard A.

doi:10.1073/pnas.1914422117

Title: Arabidopsis Dehiscence Zone Polygalacturonase 1 (ADPG1) releases latent defense signals in stems with reduced lignin content

Journal Article · Thu Jan 23 00:00:00 EST 2020 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1914422117· OSTI ID:1625055

Gallego-Giraldo, Lina ^[1]; Liu, Chang ^[1];

^[2];

^[3]; Peralta, Angelo Gabriel ^[4]; Young, Jenna ^[5]; Westpheling, Jan ^[6];

^[4]; Rao, Xiaolan ^[7];

^[2];

^[8];

^[9]

Univ. of North Texas, Denton, TX (United States). BioDiscovery Inst. and Dept. of Biological Sciences
Univ. of Leeds, Leeds (United Kingdom). Faculty of Biological Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center; Univ. of Georgia, Athens, GA (United States). Complex Carbohydrate Research Center
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center; Univ. of Georgia, Athens, GA (United States). Complex Carbohydrate Research Center and Dept. of Plant Biology; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Bioenergy Innovation
Univ. of Georgia, Athens, GA (United States). Dept. of Genetics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Bioenergy Innovation; Univ. of Georgia, Athens, GA (United States). Dept. of Genetics
Univ. of North Texas, Denton, TX (United States). BioDiscovery Inst. and Dept. of Biological Sciences; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center
Ghent Univ. (Belguim). Dept. of Plant Biotechnology and Bioinformatics; Vlaams Inst. voor Biotechnologie, Ghent (Belguim). Center for Plant Systems Biology
Univ. of North Texas, Denton, TX (United States). BioDiscovery Inst. and Dept. of Biological Sciences; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center and Center for Bioenergy Innovation

There is considerable interest in engineering plant cell wall components, particularly lignin, to improve forage quality and biomass properties for processing to fuels and bioproducts. However, modifying lignin content and/or composition in transgenic plants through down-regulation of lignin biosynthetic enzymes can induce expression of defense response genes in the absence of biotic or abiotic stress. Arabidopsis thaliana lines with altered lignin through down-regulation of hydroxycinnamoyl CoA:shikimate/quinate hydroxycinnamoyl transferase (HCT) or loss of function of cinnamoyl CoA reductase 1 (CCR1) express a suite of pathogenesis-related (PR) protein genes. The plants also exhibit extensive cell wall remodeling associated with induction of multiple cell wall-degrading enzymes, a process which renders the corresponding biomass a substrate for growth of the cellulolytic thermophile Caldicellulosiruptor bescii lacking a functional pectinase gene cluster. The cell wall remodeling also results in the release of size- and charge-heterogeneous pectic oligosaccharide elicitors of PR gene expression. Genetic analysis shows that both in planta PR gene expression and release of elicitors are the result of ectopic expression in xylem of the gene Arabidopsis Dehiscence Zone Polygalacturonase 1 (ADPG1), which is normally expressed during anther and silique dehiscence. These data highlight the importance of pectin in cell wall integrity and the value of lignin modification as a tool to interrogate the informational content of plant cell walls.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); USDOE Bioenergy Research Centers (BRC) (United States). Center for Bioenergy Innovation (CBI)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)' National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; PIEF-GA-2013-625270; DBI-0421683; IOS-0923992

OSTI ID:: 1625055

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, Issue 6; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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59 BASIC BIOLOGICAL SCIENCES
Science & technology - other topics
cell wall remodeling
lignin modification
defense response
elicitor
polygalacturonase

Title: Arabidopsis Dehiscence Zone Polygalacturonase 1 (ADPG1) releases latent defense signals in stems with reduced lignin content

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