Lightnews — Scholar-powered news

Reposted by Mélanie Rich 🌱🍄

Nancy Choudhary @nancy-choudhary.bsky.social · 12h

Have you ever wondered why pumpkins are never purple or blue like other plants? 🎃🌈

While most plants can produce pink, blue, and purple pigments (thanks to anthocyanins), the Cucurbitaceae family 🍈 🍉 🥒have lost all the pathway genes to produce these pigments.
🔗 doi.org/10.1101/2025...

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Reposted by Mélanie Rich 🌱🍄

PM Delaux @pierremarcdelaux.bsky.social · 1d

A first dive in fern x pathogen interaction! More to come!

Congratulations @baptistebio.bsky.social @jacquet-chris.bsky.social et al.!

Jacquet-chris @jacquet-chris.bsky.social · 1d

Want to see ferns under attack and how they respond to pathogens? Check out our latest paper!
doi.org/10.1186/s129...
Congrats on this huge team effort to @baptistebio.bsky.social @madeleinebaker.bsky.social @kellerjeanphd.bsky.social @maximebonhomme.bsky.social @pierremarcdelaux.bsky.social

Various ferns species inoculated with S. sclerotiorum.

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Reposted by Mélanie Rich 🌱🍄

Jacquet-chris @jacquet-chris.bsky.social · 1d

Want to see ferns under attack and how they respond to pathogens? Check out our latest paper!
doi.org/10.1186/s129...
Congrats on this huge team effort to @baptistebio.bsky.social @madeleinebaker.bsky.social @kellerjeanphd.bsky.social @maximebonhomme.bsky.social @pierremarcdelaux.bsky.social

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Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 1d

This was indeed a fun read! Nothing makes you feel stupid as much as trying to read a paper out of your scope of knowledge

Reposted by Mélanie Rich 🌱🍄

Malick Mbengue @malick-mbengue.bsky.social · 1d

I wished I could have written something like this. Rude, fun and meaningful.
static1.squarespace.com/static/686d9...

static1.squarespace.com

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Reposted by Mélanie Rich 🌱🍄

Nikolaj Abel @nikolajabel.bsky.social · 3d

Congratulation to our colleagues for this amazing work!

Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

So happy to see the latest preprint of the team out! www.biorxiv.org/content/10.1...
The continuation of a long standing project started by @oswaldovaldesl.bsky.social in @jeanmichelane.bsky.social‘s lab. 1/7 🧵

EPP1 is an ancestral component of the plant Common Symbiosis Pathway

The success of plants on land has been enabled by mutualistic intracellular associations with microbes for 450 million years ([Delaux and Schornack 2021][1]). Because of their intracellular nature, th...

www.biorxiv.org

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Reposted by Mélanie Rich 🌱🍄

Jennifer Mach (she/they) @jennifermach.bsky.social · 4d

Thank you for the 🧵 ! Tagging for the #PlantScience feed!

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Reposted by Mélanie Rich 🌱🍄

PM Delaux @pierremarcdelaux.bsky.social · 4d

~12 years after we coined it EPP1 with @oswaldovaldesl.bsky.social one afternoon when we were postdoc with @jeanmichelane.bsky.social!

Congrats @melaniekrich.bsky.social @tatiana-vernie.bsky.social et al. for the hard work!

EPP1 is the fourth member of the Common Symbiosis Pathway 🍄🌱!

Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

So happy to see the latest preprint of the team out! www.biorxiv.org/content/10.1...
The continuation of a long standing project started by @oswaldovaldesl.bsky.social in @jeanmichelane.bsky.social‘s lab. 1/7 🧵

EPP1 is an ancestral component of the plant Common Symbiosis Pathway

The success of plants on land has been enabled by mutualistic intracellular associations with microbes for 450 million years ([Delaux and Schornack 2021][1]). Because of their intracellular nature, th...

www.biorxiv.org

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Reposted by Mélanie Rich 🌱🍄

Society for the Protection of Underground Networks (SPUN) @spun.earth · 4d

What Everyone Should Know About Fungi by Age 15

5️⃣ Mycorrhizal fungi are often first responders post wildfires, droughts, and human disturbances, helping plants regenerate, rebuild root systems & reestablish nutrient pathways.

See the top 10 list (buff.ly/nMNaB60) and follow for new fungal facts.

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Reposted by Mélanie Rich 🌱🍄

Tatiana Vernié @tatiana-vernie.bsky.social · 4d

Really glad to share this team work

Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

Previously, Early Phosphorylated Protein 1 (EPP1) was suggested to play an essential role in Root Nodule Symbiosis but the high copy number of EPP1 genes in Medicago (4!) limited our ability to study its function doi.org/10.1093/pcp/... doi.org/10.1111/nph.... . 3/7

A Novel Positive Regulator of the Early Stages of Root Nodule Symbiosis Identified by Phosphoproteomics

Abstract. Signals and signaling pathways underlying the symbiosis between legumes and rhizobia have been studied extensively over the past decades. In a pr

doi.org

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Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

Together with new data in RNS from our colleagues @nikolajabel.bsky.social et al. doi.org/10.1101/2025..., we hope close the gap in our understanding of the common symbiosis pathway for plant endosymbioses! 7/7

Schematic representation of the Common Symbiosis Pathway. The plasma membrane receptor SYMRK phosphorylates EPP1, this leads to a calcium spiking activation of the kinase CCaMK that in turn phosphorylates the transcription factor CYCLOPS to activate the symbiotic program

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Reposted by Mélanie Rich 🌱🍄

Baptiste Castel @baptistebio.bsky.social · 4d

www.biorxiv.org/content/10.1...
and
www.biorxiv.org/content/10.1...

Two papers to tell us more about mysterious EPP1, a protein required for symbiosis. Well done @tatiana-vernie.bsky.social and all co-authors.

EPP1 is an ancestral component of the plant Common Symbiosis Pathway

The success of plants on land has been enabled by mutualistic intracellular associations with microbes for 450 million years ([Delaux and Schornack 2021][1]). Because of their intracellular nature, th...

www.biorxiv.org

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Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

We propose that EPP1 has been a core component of AMS signaling since the origin of land plants as we know them 🌱🍄 6/7

doi.org

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Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

Here we show abolition of AMS in epp1 mutants in the flowering plant Petunia and in the liverwort Marchantia. We also find that EPP1 is directly phosphorylated by the SYMRK receptor and that the epp1 phenotype can be complemented by an autoactive version of the kinase CCaMK 5/7

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Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

Knowing EPP1 belongs to the short list of genes conserved across land plants in species with the ability to form endosymbiosis and convergently lost in the ones having lost this ability, we decided switch model plants to test the function of EPP1 in Arbuscular Mycorrhiza Symbiosis (AMS). 4/7

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Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

Previously, Early Phosphorylated Protein 1 (EPP1) was suggested to play an essential role in Root Nodule Symbiosis but the high copy number of EPP1 genes in Medicago (4!) limited our ability to study its function doi.org/10.1093/pcp/... doi.org/10.1111/nph.... . 3/7

A Novel Positive Regulator of the Early Stages of Root Nodule Symbiosis Identified by Phosphoproteomics

Abstract. Signals and signaling pathways underlying the symbiosis between legumes and rhizobia have been studied extensively over the past decades. In a pr

doi.org

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Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

With @tatiana-vernie.bsky.social @mbianc.bsky.social @baptistebio.bsky.social @kellerjeanphd.bsky.social @malick-mbengue.bsky.social @pierremarcdelaux.bsky.social and many others 2/7

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Mélanie Rich 🌱🍄 @melaniekrich.bsky.social · 4d

So happy to see the latest preprint of the team out! www.biorxiv.org/content/10.1...
The continuation of a long standing project started by @oswaldovaldesl.bsky.social in @jeanmichelane.bsky.social‘s lab. 1/7 🧵

EPP1 is an ancestral component of the plant Common Symbiosis Pathway

The success of plants on land has been enabled by mutualistic intracellular associations with microbes for 450 million years ([Delaux and Schornack 2021][1]). Because of their intracellular nature, th...

www.biorxiv.org

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Reposted by Mélanie Rich 🌱🍄

Nikolaj Abel @nikolajabel.bsky.social · 8d

For more information: academic.oup.com/pcp/article/...
nph.onlinelibrary.wiley.com/doi/10.1111/...

A Novel Positive Regulator of the Early Stages of Root Nodule Symbiosis Identified by Phosphoproteomics

Abstract. Signals and signaling pathways underlying the symbiosis between legumes and rhizobia have been studied extensively over the past decades. In a pr

academic.oup.com

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Reposted by Mélanie Rich 🌱🍄

Nikolaj Abel @nikolajabel.bsky.social · 8d

Our findings suggest that EPP1 serves as a key molecular bridge between plasma membrane signaling and downstream responses doing root nodule symbiosis, helping to close a long-standing gap in the field.
Congratulations to everyone involved in this work!

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Reposted by Mélanie Rich 🌱🍄

Nikolaj Abel @nikolajabel.bsky.social · 8d

We’re thrilled to share our latest preprint!
In this study we provide a mechanistic insight into how the protein EPP1 (first identified in Rose et al., 2012) functions in partnership with SYMRK.
www.biorxiv.org/content/10.1...

EPP1 couples receptor activation to cytoplasmic signaling in root nodule symbiosis

Legume symbiosis with nitrogen-fixing bacteria is controlled by a cascade of signaling events leading to root nodule development. While plant cell-surface receptors initiate this process, the link bet...

www.biorxiv.org

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Reposted by Mélanie Rich 🌱🍄

Jonathan C Slaght @jonathanslaght.com · 7d

super cool study found human artifacts in Bearded vulture nests, incl. "weaponry like a crossbow bolt and wooden lance, decorated sheep leather, and parts of a slingshot....a shoe made from twigs and grass is ~675-years-old." link to paper: doi.org/10.1002/ecy..... www.popsci.com/environment/... 🧪🌍🦉

Multi-generational vulture nests hold 700 years of human artifacts

Crossbow bolts, sandals, slingshots, and more.

www.popsci.com

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Reposted by Mélanie Rich 🌱🍄

Ignacio_Rubio-Somoza @ignaciorubiosomoza.bsky.social · 7d

Fantastic work from @pierremarcdelaux.bsky.social annd col. expanding the basic genetic toolkit enabling symbiotic interactions in plants www.biorxiv.org/content/10.1...

EPP1 is an ancestral component of the plant Common Symbiosis Pathway

The success of plants on land has been enabled by mutualistic intracellular associations with microbes for 450 million years (Delaux and Schornack 2021). Because of their intracellular nature, the est...

www.biorxiv.org

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Reposted by Mélanie Rich 🌱🍄

oswaldovaldesl.bsky.social @oswaldovaldesl.bsky.social · 8d

www.biorxiv.org/content/10.1...
Great story in collaboration with @pierremarcdelaux.bsky.social and @jeanmichelane.bsky.social groups. EPP1 story continues after many years of collaborations with Pierre-Marc and Jean-Michel!!!

EPP1 is an ancestral component of the plant Common Symbiosis Pathway

The success of plants on land has been enabled by mutualistic intracellular associations with microbes for 450 million years (Delaux and Schornack 2021). Because of their intracellular nature, the est...

www.biorxiv.org

6 5

Reposted by Mélanie Rich 🌱🍄

Malick Mbengue @malick-mbengue.bsky.social · 8d

I repeat, the Common Signalling pathway for symbiosis is on fire! Kudos to our colleagues from Toulouse 🍄🌿

bioRxiv Plant Bio @biorxiv-plants.bsky.social · 8d

EPP1 is an ancestral component of the plant Common SymbiosisPathway https://www.biorxiv.org/content/10.1101/2025.09.30.679610v1

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