Tanja Pyhäjärvi
@pyhatanja.bsky.social
Professor in Forest Genomics and Breeding, Faculty of Agriculture and Forestry, University of Helsinki, Finland
Loves gymnosperms and bad behavior, best when combined!
Loves gymnosperms and bad behavior, best when combined!
It is a little bit depressing that 80 % of papers applying population genetic methods typically estimate π (nucleotide diversity per bp) wrong, and even worse, do not realize that when looking at the point estimates.
October 20, 2025 at 8:01 AM
It is a little bit depressing that 80 % of papers applying population genetic methods typically estimate π (nucleotide diversity per bp) wrong, and even worse, do not realize that when looking at the point estimates.
Reposted by Tanja Pyhäjärvi
Out after peer review, collaborative study from Nordborg & Weigel labs with help from many others. Not the largest collection of new Arabidopsis thaliana genomes, but we hopefully put forward some good ideas for how to think about pangenomes and their analysis!
www.nature.com/articles/s41...
www.nature.com/articles/s41...
August 20, 2025 at 6:23 AM
Out after peer review, collaborative study from Nordborg & Weigel labs with help from many others. Not the largest collection of new Arabidopsis thaliana genomes, but we hopefully put forward some good ideas for how to think about pangenomes and their analysis!
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Reposted by Tanja Pyhäjärvi
Baffling failure of a well-studied trade-off in plants to survive the transfer from greenhouse studies to the open field. Intriguing study from @derekseveri.bsky.social @plantevolution.bsky.social and colleagues in @plosbiology.org
In the greenhouse, #Arabidopsis with hyperactive ACD6 have stronger pathogen defenses but are smaller & make fewer seeds. @derekseveri.bsky.social @plantevolution.bsky.social &co show that in the open field both advantages & disadvantages of the allele disappear @plosbiology.org 🧪 plos.io/465XPDR
![A hyperactive ACD6 allele reduces growth and causes necrosis only in the greenhouse. Top: Representative Arabidopsis thaliana rosettes from different genetic backgrounds. Yellow and blue labels represent descendants of a heterozygous ACD6 HIF line that are homozygous for either the Est-1 or the Col-0 allele of ACD6. Green and purple labels represent the Est-1 accession and the isogenic acd6 knockout null allele in that accession. Plants were grown in Tübingen in the greenhouse (GH-Tü), outdoors in the field in Tübingen (F-Tü), or outdoors in the field in Zurich (F-Z, a GMO-approved facility). Note the necrotic older leaves for greenhouse plants with the ACD6-Est-1 allele (red arrows). Bottom: Rosette size of individual plants, calculated by quantifying green pixels from images similar to those in the top panel. The line within each box represents the median. Boxes enclose the interquartile range (IQR) with whiskers extending to up to 1.5 times the IQR. Brackets indicate Mann–Whitney U-test results, with * indicating P < 0.05 after Benjamini–Hochberg correction for multiple testing across the four comparisons. Dotted lines extending from the mean of each distribution span the observed effect size, and a bootstrapped distribution of computed effect sizes [30] is shown in gray, centered on the mean of the second box in each pair (red dot). The black bar extending vertically from the red dot represents the 95% confidence interval of the effect size.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:5522ztebtekoor5efelihqhb/bafkreiaqunadge3nltwergaw3byzldjmd7k2prjfsz7tfv4ycecjvwxmtm@jpeg)
July 16, 2025 at 9:28 AM
Baffling failure of a well-studied trade-off in plants to survive the transfer from greenhouse studies to the open field. Intriguing study from @derekseveri.bsky.social @plantevolution.bsky.social and colleagues in @plosbiology.org
Reposted by Tanja Pyhäjärvi
We are seeking two postdoctoral researchers or doctoral researchers for: (i) Remote sensing advised country-wide genotype-phenotype linking, and (ii) Country-wide study of genetic adaptation and population structure dynamics in a changing climate. jobs.helsinki.fi/job/Helsinki...
Two postdoctoral researchers and/or doctoral researcher, Future Forests
Two postdoctoral researchers and/or doctoral researcher, Future Forests
jobs.helsinki.fi
June 26, 2025 at 8:01 AM
We are seeking two postdoctoral researchers or doctoral researchers for: (i) Remote sensing advised country-wide genotype-phenotype linking, and (ii) Country-wide study of genetic adaptation and population structure dynamics in a changing climate. jobs.helsinki.fi/job/Helsinki...
Reposted by Tanja Pyhäjärvi
You know over the years what I have been really bothered by? When I was in college, bryophytes were taught as if they were relics of the past. Its sole purpose was to demonstrate trait progression leading to angiosperm, w/o mentioning their importance in nature, research, or potential in biotech.
July 4, 2025 at 1:06 PM
You know over the years what I have been really bothered by? When I was in college, bryophytes were taught as if they were relics of the past. Its sole purpose was to demonstrate trait progression leading to angiosperm, w/o mentioning their importance in nature, research, or potential in biotech.
Googlen NotebookLM on alkanut tehdä suomenkielisiä pocasteja. Nais-AI:n ääni kuulostaa karmivan samalle kuin Tuija Pehkonen. Pehkonenhan on ollut radiossa paljon äänessä.
July 4, 2025 at 12:59 PM
Googlen NotebookLM on alkanut tehdä suomenkielisiä pocasteja. Nais-AI:n ääni kuulostaa karmivan samalle kuin Tuija Pehkonen. Pehkonenhan on ollut radiossa paljon äänessä.
We are seeking two postdoctoral researchers or doctoral researchers for: (i) Remote sensing advised country-wide genotype-phenotype linking, and (ii) Country-wide study of genetic adaptation and population structure dynamics in a changing climate. jobs.helsinki.fi/job/Helsinki...
Two postdoctoral researchers and/or doctoral researcher, Future Forests
Two postdoctoral researchers and/or doctoral researcher, Future Forests
jobs.helsinki.fi
June 26, 2025 at 8:01 AM
We are seeking two postdoctoral researchers or doctoral researchers for: (i) Remote sensing advised country-wide genotype-phenotype linking, and (ii) Country-wide study of genetic adaptation and population structure dynamics in a changing climate. jobs.helsinki.fi/job/Helsinki...
Who started this ridiculous habit of using K for thousands? 10K run? 10 kelvin run is freezing! And now in scientific writing too. I know there are big battles going on now, but I will focus on this one instead.
June 26, 2025 at 7:13 AM
Who started this ridiculous habit of using K for thousands? 10K run? 10 kelvin run is freezing! And now in scientific writing too. I know there are big battles going on now, but I will focus on this one instead.
Reposted by Tanja Pyhäjärvi
The de-extinction of the dire wolves?
"Colossal Baloney"— @stemcells.bsky.social
www.latimes.com/business/sto...
@latimes.com by @hiltzikm.bsky.social
"Colossal Baloney"— @stemcells.bsky.social
www.latimes.com/business/sto...
@latimes.com by @hiltzikm.bsky.social
April 27, 2025 at 3:00 PM
The de-extinction of the dire wolves?
"Colossal Baloney"— @stemcells.bsky.social
www.latimes.com/business/sto...
@latimes.com by @hiltzikm.bsky.social
"Colossal Baloney"— @stemcells.bsky.social
www.latimes.com/business/sto...
@latimes.com by @hiltzikm.bsky.social
Reposted by Tanja Pyhäjärvi
The NSF discontinuing “misinformation” research b/c it threatens free speech is laughable. 9/
April 24, 2025 at 12:56 AM
The NSF discontinuing “misinformation” research b/c it threatens free speech is laughable. 9/
Still waiting for a reimbursement from a US University that invited me there to give a talk last August. My advice: do not ever pay the travel expenses yourself when invited and promised reimbursement.
April 23, 2025 at 10:06 AM
Still waiting for a reimbursement from a US University that invited me there to give a talk last August. My advice: do not ever pay the travel expenses yourself when invited and promised reimbursement.
Me to my lab members: "No need to stress about your Lab Meeting presentation. Just show us where you are at in your project". Also me: *spending 8 hours to prepare my own lab meeting presentation and getting nervous about it*.
kermit the frog is using a typewriter in a messy room .
ALT: kermit the frog is using a typewriter in a messy room .
media.tenor.com
April 2, 2025 at 6:24 PM
Me to my lab members: "No need to stress about your Lab Meeting presentation. Just show us where you are at in your project". Also me: *spending 8 hours to prepare my own lab meeting presentation and getting nervous about it*.
Today I have spoiled myself with reading just single review paper all day, taking pauses to think. Luxury!
March 31, 2025 at 11:37 AM
Today I have spoiled myself with reading just single review paper all day, taking pauses to think. Luxury!
Reposted by Tanja Pyhäjärvi
I'm excited to share our new preprint on the molecular evolution of heterodichogamy in two wingnut genera of Juglandaceae. Heterodichogamy features two morphs synchronously alternating male and female flowering phases in time to generate disassortative mating.
doi.org/10.1101/2025...
doi.org/10.1101/2025...
March 11, 2025 at 5:34 PM
I'm excited to share our new preprint on the molecular evolution of heterodichogamy in two wingnut genera of Juglandaceae. Heterodichogamy features two morphs synchronously alternating male and female flowering phases in time to generate disassortative mating.
doi.org/10.1101/2025...
doi.org/10.1101/2025...
Reposted by Tanja Pyhäjärvi
"Yleisradion perinteiset alueelliset iltapäivälähetykset Radio Suomessa ovat loppuneet."
"[---] Ylen johto tapaa parhaillaan aluetoimitusten henkilöstöä ja kertoo heille heidän työsuhteensa kohtalosta."
www.lapinkansa.fi/yle-lopetti-...
"[---] Ylen johto tapaa parhaillaan aluetoimitusten henkilöstöä ja kertoo heille heidän työsuhteensa kohtalosta."
www.lapinkansa.fi/yle-lopetti-...
Yle lopetti radion alueelliset iltapäivälähetykset vähin äänin – johto ei kommentoi sanallakaan
Yleisradion perinteiset alueelliset iltapäivälähetykset Radio Suomessa ovat loppuneet. Esimerkiksi Yle Lapista ei tule enää itsenäistä iltapäivälähetystä.
www.lapinkansa.fi
March 11, 2025 at 6:52 PM
"Yleisradion perinteiset alueelliset iltapäivälähetykset Radio Suomessa ovat loppuneet."
"[---] Ylen johto tapaa parhaillaan aluetoimitusten henkilöstöä ja kertoo heille heidän työsuhteensa kohtalosta."
www.lapinkansa.fi/yle-lopetti-...
"[---] Ylen johto tapaa parhaillaan aluetoimitusten henkilöstöä ja kertoo heille heidän työsuhteensa kohtalosta."
www.lapinkansa.fi/yle-lopetti-...
Reposted by Tanja Pyhäjärvi
The newer sequencing tech, Oxford Nanopore, is traded on the London exchange as part of the FTSE 250, and it is likewise having a rough day, down 10% today so far, 42% since Trump took office.
These tools are how we genotype cancer, flu, measles, etc., by the way.
These tools are how we genotype cancer, flu, measles, etc., by the way.
March 4, 2025 at 12:27 PM
The newer sequencing tech, Oxford Nanopore, is traded on the London exchange as part of the FTSE 250, and it is likewise having a rough day, down 10% today so far, 42% since Trump took office.
These tools are how we genotype cancer, flu, measles, etc., by the way.
These tools are how we genotype cancer, flu, measles, etc., by the way.
Reposted by Tanja Pyhäjärvi
It’s time to say it plainly. America’s leadership has switched sides in the war. The American people have not, and they should speak up.
Editorial: A president just disrespected America in the Oval Office. It wasn’t Zelensky
It’s time to say it plainly. America’s leadership has switched sides in the war. The American people have not, and they should speak up.
In the past several weeks, the U.S. leadership has demonstrate...
kyivindependent.com
February 28, 2025 at 10:46 PM
It’s time to say it plainly. America’s leadership has switched sides in the war. The American people have not, and they should speak up.
I do not talk about politics a lot here. But the way Trump and Vance talked to Zelenskyi is the most disgusting thing I have seen for a long time. So sad, we are not able to really stand up for Ukraine. We could do so much more.
February 28, 2025 at 8:17 PM
I do not talk about politics a lot here. But the way Trump and Vance talked to Zelenskyi is the most disgusting thing I have seen for a long time. So sad, we are not able to really stand up for Ukraine. We could do so much more.
Reposted by Tanja Pyhäjärvi
Zelensky is a wartime leader watching his people suffer and die under Russian attacks every day. To be lectured and lied to by Trump and Vance, as they defend the war criminal dictator committing these atrocities, is unimaginable agony. An everlasting shame for America.
Trump has not uttered a critical word about Putin but he and his VP publicly belittled the leader of the nation Putin invaded.
February 28, 2025 at 7:15 PM
Zelensky is a wartime leader watching his people suffer and die under Russian attacks every day. To be lectured and lied to by Trump and Vance, as they defend the war criminal dictator committing these atrocities, is unimaginable agony. An everlasting shame for America.
Reposted by Tanja Pyhäjärvi
Watched meeting between Trump and Zelensky and all I can say is that I have never ever seen something like that. IMO, disrespectful were Trump and Vance, not Zelensky. And not only to the US but to Ukraine and Europe as well.
February 28, 2025 at 7:14 PM
Watched meeting between Trump and Zelensky and all I can say is that I have never ever seen something like that. IMO, disrespectful were Trump and Vance, not Zelensky. And not only to the US but to Ukraine and Europe as well.
Reposted by Tanja Pyhäjärvi
seriously, how did nobody question (from the ethics review stage to publication) this 🔽 research using and abusing rats! #AnimalEthics #AnimalWelfare
February 14, 2025 at 6:18 AM
seriously, how did nobody question (from the ethics review stage to publication) this 🔽 research using and abusing rats! #AnimalEthics #AnimalWelfare
Reposted by Tanja Pyhäjärvi
A few warm days stimulate early-flowering trees. This hazel alder, Alnus serrulata, has opened long yellow catkins - male inflorescences - to release pollen to the wind. The red female inflorescence opens a bit later on an individual tree to minimize self-pollination. Are you seeing tree flowers?
February 6, 2025 at 5:43 PM
A few warm days stimulate early-flowering trees. This hazel alder, Alnus serrulata, has opened long yellow catkins - male inflorescences - to release pollen to the wind. The red female inflorescence opens a bit later on an individual tree to minimize self-pollination. Are you seeing tree flowers?