Plant Defense and Long‐Distance Signaling in the Phloem

Gaupels, Frank; Vlot, A. Corina

doi:10.1002/9781118382806.ch11

Cited by 13 publications

(17 citation statements)

References 131 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Taken together, the available data support a role of redox signalling by NO and ROS in systemic immunity to microbial pathogens. SAR is at least to a large extent mediated by the phloem (Gaupels & Corina Vlot, ; Lucas et al ., ), and GSNOR is an important modulator of SAR. However, whether GSNO and H 2 O 2 are mobile in the phloem remains to be shown.…”

Section: Sar Involves No and Ros Signalling In The Phloemmentioning

confidence: 99%

Production, amplification and systemic propagation of redox messengers in plants? The phloem can do it all!

2017

Self Cite

View full text Add to dashboard Cite

Rapid long-distance signalling is an emerging topic in plant research, and is particularly associated with responses to biotic and abiotic stress. Systemic acquired resistance (SAR) to pathogen attack is dependent on nitric oxide (NO) and reactive oxygen species (ROS) such as hydrogen peroxide (H O ). By comparison, systemic wound responses (SWRs) and systemic acquired acclimation (SAA) to abiotic stress encounters are triggered by rapid waves of H O , calcium and electrical signalling. Efforts have been made to decipher the relationship between redox messengers, calcium and other known systemic defence signals. Less is known about possible routes of signal transduction throughout the entire plant. Previously, the phloem has been suggested to be a transport conduit for mobile signals inducing SAR, SWR and SAA. This review highlights the role of the phloem in systemic redox signalling by NO and ROS. A not yet identified calcium-dependent NO source and S-nitrosoglutathione reductase are candidate regulators of NO homeostasis in the phloem, whereas ROS concentrations are controlled by NADPH oxidases and the H O -scavenging enzyme ascorbate peroxidase. Possible amplification mechanisms in phloem-mediated systemic redox signalling are discussed.

show abstract

Section: Sar Involves No and Ros Signalling In The Phloemmentioning

confidence: 99%

Production, amplification and systemic propagation of redox messengers in plants? The phloem can do it all!

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…After leaf wounding JA and its bioactive conjugate JA-isoleucine rapidly accumulated within 30 min in pumpkin phloem latex collected from distant petioles and stems indicating the onset of a systemic wound response (SWR) (Gaupels et al, 2012). During SWR JA is synthesized in the phloem and is transported as a systemic phloem-mobile signal (Li et al, 2002; Gaupels et al, 2012; Gaupels and Vlot, 2012). …”

Section: Defence-related Molecules In Phloem Latexmentioning

confidence: 99%

The extrafascicular phloem is made for fighting

Gaupels¹,

Ghirardo²

2013

Front. Plant Sci.

Self Cite

View full text Add to dashboard Cite

“…Previous studies have shown that Arabidopsis protein secretion is highly regulated during P. syringae-induced defense responses, including SAR, with effectors such as AvrRpm1 likely directly affecting protein secretion (Hauck et al, 2003;Wang et al, 2005;Kaffarnik et al, 2009). Arabidopsis is an apoplastic phloem loader (Gottwald et al, 2000), and the phloem is believed to be the main conduit for SAR signal transmission (Guedes et al, 1980;Gaupels and Vlot, 2013). Therefore, we relate SAR to proteins differentially accumulating in the apoplast of wild-type and eds1 leaves in response to AvrRpm1.…”

mentioning

confidence: 99%

Contrasting Roles of the Apoplastic Aspartyl Protease APOPLASTIC, ENHANCED DISEASE SUSCEPTIBILITY1-DEPENDENT1 and LEGUME LECTIN-LIKE PROTEIN1 in Arabidopsis Systemic Acquired Resistance ,

Breitenbach¹,

Wenig²,

Wittek³

et al. 2014

Plant Physiology

Self Cite

132

185

View full text Add to dashboard Cite

Systemic acquired resistance (SAR) is an inducible immune response that depends on ENHANCED DISEASE SUSCEPTIBILITY1 (EDS1).Here, we show that Arabidopsis (Arabidopsis thaliana) EDS1 is required for both SAR signal generation in primary infected leaves and SAR signal perception in systemic uninfected tissues. In contrast to SAR signal generation, local resistance remains intact in eds1 mutant plants in response to Pseudomonas syringae delivering the effector protein AvrRpm1. We utilized the SAR-specific phenotype of the eds1 mutant to identify new SAR regulatory proteins in plants conditionally expressing AvrRpm1. Comparative proteomic analysis of apoplastenriched extracts from AvrRpm1-expressing wild-type and eds1 mutant plants led to the identification of 12 APOPLASTIC, EDS1-DEPENDENT (AED) proteins. The genes encoding AED1, a predicted aspartyl protease, and another AED, LEGUME LECTIN-LIKE PROTEIN1 (LLP1), were induced locally and systemically during SAR signaling and locally by salicylic acid (SA) or its functional analog, benzo 1,2,3-thiadiazole-7-carbothioic acid S-methyl ester. Because conditional overaccumulation of AED1-hemagglutinin inhibited SAinduced resistance and SAR but not local resistance, the data suggest that AED1 is part of a homeostatic feedback mechanism regulating systemic immunity. In llp1 mutant plants, SAR was compromised, whereas the local resistance that is normally associated with EDS1 and SA as well as responses to exogenous SA appeared largely unaffected. Together, these data indicate that LLP1 promotes systemic rather than local immunity, possibly in parallel with SA. Our analysis reveals new positive and negative components of SAR and reinforces the notion that SAR represents a distinct phase of plant immunity beyond local resistance.

show abstract

Plant Defense and Long‐Distance Signaling in the Phloem

Cited by 13 publications

References 131 publications

Production, amplification and systemic propagation of redox messengers in plants? The phloem can do it all!

Production, amplification and systemic propagation of redox messengers in plants? The phloem can do it all!

The extrafascicular phloem is made for fighting

Contrasting Roles of the Apoplastic Aspartyl Protease APOPLASTIC, ENHANCED DISEASE SUSCEPTIBILITY1-DEPENDENT1 and LEGUME LECTIN-LIKE PROTEIN1 in Arabidopsis Systemic Acquired Resistance ,

Contact Info

Product

Resources

About