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Erik Slootweg

@erikslootweg.bsky.social

Plants, Plant-parasitic fungi, Molecular Plant Biology Citizen science @ Floron, NMV, waarneming.nl, NDFF CRISPRing plants @ Hudson River Biotechnology, Wageningen

118 Posts575 Follower1269 Folgt
Erik Slootweg@erikslootweg.bsky.social · 2mo ago

Number 4 (and the last I post) is a rust fungus that I haven't seen before, with aecia on Leucanthemum vulgare. The spore size indicates it is Puccinia leucanthemi-vernae, which has Carex caryophyllea as alternative host. Carex montana, host for a similar rust, was also present. #fungifriends

aecia with dark yellow aeciospores and a lighter peridium in a reddish spot on the underside of a leaf of Leucanthemum vulgareAeciospores (center) and peridium from Puccinia leucanthemi-vernae. Microscopic image of aeciospores with diameters indicated in micrometers
Erik Slootweg@erikslootweg.bsky.social · 2mo ago

Number 3 appears to be the rarest of the fungi I found this weekend; Puccinia globulariae (Kogelbloemroest) on Globularia bisnagarica (Gewone kogelbloem in Dutch). Only a few georeferenced records in GBIF. The leaves had dark spots were the rust's telia were located on the underside. #Fungifriends

Healthy Globularia bisnagarica (globeflower) plant. Dark brown telia from Puccinia globulariae on the underside of a leaf of Globularia bisnagarica. Dark spots on the upperside of the leaf where the telia of the rust Puccinia globulariae are located on the undersideTwo-celled teliospores of Puccinia globulariae. The out of focus spores have partially germinated and are empty. The sizes in micrometer are indicated
Kenneth Loi@kenjmloi.bsky.social · 3mo ago

Excited to share our discovery of a new programmable RNA-guided DNA-targeting system hiding inside bacteriophages that predates CRISPR. We call it VIPR (Viral Interference Programmable Repeat), and it uses an entirely new logic to find its targets. Thread + link below.

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Chris Thorogood@christhorogood.bsky.social · 4mo ago

We sequenced the genome of 'desert ginseng' (Cistanche deserticola) - a leafless parasitic plant that gave up photosynthesis - and found it lost huge chunks of its own genome…but started stealing genes from its host! Thanks to my collaborators Prof Huang + her talented team👏🏻 lnkd.in/evF5iU9G

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Marc Somssich@somssich.bsky.social · 5mo ago

The fact that Americans thought Auxin was a “Hoax from Europe” rightfully got some attention in my latest #PlantScienceClassics post. But it’s actually even funnier if you learn about the context & consequence of White speaking these words to Went at the AAAS Meeting in Pittsburgh. #PlantScience 🧪 🧵

Marc Somssich@somssich.bsky.social · 5mo ago

When Frits Went once failed to demonstrate the effect of auxin at an AAAS meeting, it was White who loudly declared “that the auxin business was obviously a hoax and that it was high time that these charlatans from Europe were sent back to where they belonged”. An experience that shook Went.

Erik Slootweg@erikslootweg.bsky.social · last yr.

The rust Puccinia thlaspeos on Noccaea caerulescens. The rust infection changes the morphology of the plant; instead of flowering stems its stems are full of yellowish leaves covered with telea on the underside. Here on soil heavily contaminated with heavy metals in Kelmis, Belgium.

microscopic image of teleospores of Puccinia thlaspeosunderside of leaf of Noccaea caerulescens with telia BildNoccaea caerulescens with one healthy flowering stem and five stems deformed by the rust Puccinia thlaspeos
Frédéric Suffert@wheatpath.bsky.social · last yr.

Happy to share this preprint confirming "Uromyces plumbarius first reported on Oenothera lindheimeri in Europe with widespread distribution and association with the rust hyperparasite Sphaerellopsis sp." Thanks @pascal-frey.bsky.social & @erikslootweg.bsky.social! doi.org/10.1101/2025...

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Frédéric Suffert@wheatpath.bsky.social · 6y ago

#Rust on biennial gaura (#Oenothera gaura syn. Gaura biennis) maybe caused by #Uromyces plumbarius, here with telia & teliospores, Les Clayes-sous-Bois, FR. Species present in North-America (Bisby, 1916; doi:10.1002/j.1537-2197.1916.tb05434.x) but first occurrence in Europe ?! 🤔

Erik Slootweg@erikslootweg.bsky.social · 2y ago

Epicoccum andropogonis, a fungus parasitising Claviceps, a fungal parasite of grasses. Here on Glyceria maxima (Liesgras). One of two Claviceps parasites I found this day in September this year on the same plant. I really like the brainlike structure (and its old name Cerebella). #Fungifriends

spores of the Claviceps parasitising fungus Epicoccum andropogonisbrain-like fruiting structure of Epicoccum andropogonisBild
Erik Slootweg@erikslootweg.bsky.social · 2y ago

Now is the time to look for Melampsoridium carpini (Haagbeukroest) on Carpinus betulus (Haagbeuk); the bright orange spores stand out on the fallen leaves. Until recently not known in the Netherlands, but in the last 2 years seen at 4-5 locations. These were found in Doorwerth, close to Arnhem.

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