PSKR1 and PSY1R-mediated regulation of plant defense responses

Mosher, Stephen; Kemmerling, Birgit

doi:10.4161/psb.24119

Cited by 53 publications

(40 citation statements)

References 32 publications

(53 reference statements)

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“…Also higher leaf SA content was detected, when PUT pre-treatment preceded PEG-induced osmotic stress compared to the control [11]. According to these our results also support the hypothesis that there is an antagonistic relationship between SA-dependent defence pathway and phytosulfokin signalling [37].…”

Section: Discussionsupporting

confidence: 86%

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The effects of putrescine are partly overlapping with osmotic stress processes in wheat

et al. 2018

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Section: Discussionsupporting

confidence: 86%

“…It was also found that, pskr1 mutants accumulated higher levels of SA and SAresponsive pathogenesis related gene transcripts [37]. As it was previously reported under the same conditions osmotic stress increased the free SA content in the leaves .…”

Section: Discussionsupporting

confidence: 81%

The effects of putrescine are partly overlapping with osmotic stress processes in wheat

et al. 2018

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“…Exogenous addition of PSK has previously been shown to attenuate the Arabidopsis immune response to biotrophic pathogens (Igarashi et al ., ; Mosher & Kemmerling, ; Mosher et al ., ). Although PSK and AtPSY1 share no sequence similarity, they have nevertheless been hypothesized to serve similar roles (Mosher & Kemmerling, ; Mosher et al ., ; Matsubayashi, ). Thus, we hypothesized that induction of PSY signaling by PSY or RaxX21‐sY may also attenuate plant immune responses.…”

Section: Resultsmentioning

confidence: 99%

A microbially derived tyrosine‐sulfated peptide mimics a plant peptide hormone

et al. 2017

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Summary The biotrophic pathogen Xanthomonas oryzae pv. oryzae (Xoo) produces a sulfated peptide named RaxX, which shares similarity to peptides in the PSY (plant peptide containing sulfated tyrosine) family. We hypothesize that RaxX mimics the growth-stimulating activity of PSY peptides.Root length was measured in Arabidopsis and rice treated with synthetic RaxX peptides. We also used comparative genomic analyses and reactive oxygen species burst assays to evaluate the activity of RaxX and PSY peptides.Here we found that a synthetic sulfated RaxX derivative comprising 13 residues (RaxX13-sY), highly conserved between RaxX and PSY, induces root growth in Arabidopsis and rice in a manner similar to that triggered by PSY. We identified residues that are required for activation of immunity mediated by the rice XA21 receptor but that are not essential for root growth induced by PSY. Finally, we showed that a Xanthomonas strain lacking raxX is impaired in virulence.These findings suggest that RaxX serves as a molecular mimic of PSY peptides to facilitate Xoo infection and that XA21 has evolved the ability to recognize and respond specifically to the microbial form of the peptide.

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“…pskr1-3 pskr2-1 and tpst siliques present a high level of unfertilized ovules and loss of funicular guidance, suggesting the importance of PSK for funicular guidance (Stührwohldt et al, 2015). Curiously, PSKR1 was recently shown to be involved in plant defense to pathogens as well as PSK (Mosher and Kemmerling, 2013). The MPK3/MPK6 signaling pathway and the PSK signaling may link common signaling networks in plant stress response and pollen–pistil interactions.…”

Section: Funicular and Micropylar Growth – Sex Lawsmentioning

confidence: 99%

Arabinogalactan Proteins as Interactors along the Crosstalk between the Pollen Tube and the Female Tissues

2016

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Arabinogalactan proteins (AGPs) have long been considered to be implicated in several steps of the reproductive process of flowering plants. Pollen tube growth along the pistil tissues requires a multiplicity of signaling pathways to be activated and turned off precisely, at crucial timepoints, to guarantee successful fertilization and seed production. In the recent years, an outstanding effort has been made by the plant reproduction scientific community in order to better understand this process. This resulted in the discovery of a fairly substantial number of new players essential for reproduction, as well as their modes of action and interactions. Besides all the indications of AGPs involvement in reproduction, there were no convincing evidences about it. Recently, several studies came out to prove what had long been suggested about this complex family of glycoproteins. AGPs consist of a large family of hydroxyproline-rich proteins, predicted to be anchored to the plasma membrane and extremely rich in sugars. These two last characteristics always made them perfect candidates to be involved in signaling mechanisms, in several plant developmental processes. New findings finally relate AGPs to concrete functions in plant reproduction. In this review, it is intended not only to describe how different molecules and signaling pathways are functioning to achieve fertilization, but also to integrate the recent discoveries about AGPs along this process.

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PSKR1 and PSY1R-mediated regulation of plant defense responses

Cited by 53 publications

References 32 publications

The effects of putrescine are partly overlapping with osmotic stress processes in wheat

The effects of putrescine are partly overlapping with osmotic stress processes in wheat

A microbially derived tyrosine‐sulfated peptide mimics a plant peptide hormone

Arabinogalactan Proteins as Interactors along the Crosstalk between the Pollen Tube and the Female Tissues

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