Lignin‐based barrier restricts pathogens to the infection site and confers resistance in plants

Lee, Myoung‐Hoon; Jeon, Hwi Seong; Kim, Seu Ha; Chung, Joo Hee; Roppolo, Daniele; Lee, Hye‐Jung; Cho, Hong Joo; Tobimatsu, Yuki; Ralph, John; Park, Ohkmae K (2019). Lignin‐based barrier restricts pathogens to the infection site and confers resistance in plants (In Press). The EMBO journal EMBO Press 10.15252/embj.2019101948

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Pathogenic bacteria invade plant tissues and proliferate in the extracellular space. Plants have evolved the immune system to recognize and limit the growth of pathogens. Despite substantial progress in the study of plant immunity, the mechanism by which plants limit pathogen growth remains unclear. Here, we show that lignin accumulates in Arabidopsis leaves in response to incompatible interactions with bacterial pathogens in a manner dependent on Casparian strip membrane domain protein (CASP)‐like proteins (CASPLs). CASPs are known to be the organizers of the lignin‐based Casparian strip, which functions as a diffusion barrier in roots. The spread of invading avirulent pathogens is prevented by spatial restriction, which is disturbed by defects in lignin deposition. Moreover, the motility of pathogenic bacteria is negatively affected by lignin accumulation. These results suggest that the lignin‐deposited structure functions as a physical barrier similar to the Casparian strip, trapping pathogens and thereby terminating their growth.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Development
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Roppolo, Daniele

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1460-2075

Publisher:

EMBO Press

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

05 Nov 2019 15:47

Last Modified:

05 Nov 2019 15:47

Publisher DOI:

10.15252/embj.2019101948

Uncontrolled Keywords:

Arabidopsis; Casparian strip; CASPL; lignin; plant immunity

BORIS DOI:

10.7892/boris.134402

URI:

https://boris.unibe.ch/id/eprint/134402

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