How (Some) Plants Survived The K-Pg Extinction

Рет қаралды 473,071

Жыл бұрын

Perhaps for plants in times of great stress and ecological upheaval, the more DNA the better.
Thanks to Franz Anthony (franzanth.com) for the incredible reconstruction of plants in the aftermath of the K-Pg extinction.
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References:
docs.google.com/document/d/1q...

Пікірлер: 527

@YesmynameisBob Жыл бұрын

As an evolutionary botanist and population geneticist, let me just say that I both love and also hate genome duplication events. At least half of my research time is accounting for potential polyploidy.

@JohnCooper-gm6mn Жыл бұрын

As an angiosperm, I concur.

@diplosbae Жыл бұрын

I never made the connection between invasive plants and polyploidy, pretty interesting. I always figured polyploid plants were more resource-intensive as their fruits and flowers tend to grow larger (strawberry, rose)

@mimisezlol Жыл бұрын

That sounds like so much work. My condolences

@travisjacobson2334 Жыл бұрын

As a polyploid, you’ll never find me.

@throwawayacc2514 Жыл бұрын

how do i get this job

@krupam0 Жыл бұрын

I get that plant evolution might not get too many clicks, but I think at some point you really should do a video on the evolution of grasses and grasslands, seeing how it seems to be a relatively recent occurrence and how it drove the evolution of many species, including but not limited to humans.

@fyr3st0rm35 Жыл бұрын

Evolution might not get clicks but it gets chicks, ayoo. Why am I like this?

@Animallovercomedian Жыл бұрын

That would be great!

@ratillecebrasquedubitantiu4451 8 ай бұрын

But grasses evolved more than 65 million years ago

@nicks1451 Жыл бұрын

Wow I always assumed plants survived the extinction by remaining dormant as seeds underground. I had no idea that they were actually thriving their way through the event

@brianreddeman951 Жыл бұрын

Well I wouldn't call it thriving. Ferns and fungi flourished first with Angiosperms having a rough time of it at first.

@edmondantes4338 Жыл бұрын

Surviving underground must have played a part also.

@newq Жыл бұрын

The video said nothing against surviving in a dormant state, my dude. The process described in this video took a long time. Polyploidy is part of how they bounced back, not how they survived the months and years immediately following the extinction event itself.

@bjnslc Жыл бұрын

@@newq the title however says otherwise, misleading as titles are often crafted to be.

@Silverstreamhomecrafts Жыл бұрын

Me too!

@karmaarachnid8345 Жыл бұрын

Another role for polyploidy in the evolution of plants has been that when two different polyploid species hybridize with each other the hybrid offspring get a full diploid set of genes from each parent species. A hybrid of two non-polyploid plant species may not even have the same number of chromosomes from each parent so it may not be able to carry out meiosis. This means that polyploid hybrids have a better chance than most hybrid plants of being able to produce viable offspring of their own and thus give rise to new species.

@joshyoung1440 Жыл бұрын

Like I'm gonna listen to an aye-aye about plant genetics! :P jk, thanks for the info, quite cool

@wordytoed9887 Жыл бұрын

I thought organisms of two different species cannot create fertile offspring. Am I mistaken?

@lazzorfrogz2973 Жыл бұрын

@@wordytoed9887 that is the case with animals but plants crossbreed very readily hybridize species that are closely related to them and the hybrids are almost always fertile but there are few that can’t produce seed especially if they were a result of a cross genera like fatshedra which is a hybrid between a fatsia japonica and hedera helix or Leyland Cypress many landscape plants are hybrids and they are capable of producing viable seed you would be surprised on the amount of plants grown are hybrids

@adamseroka5609 Жыл бұрын

Aaaaaaaand we can exploit that to get our seedless triploid Cavendish!

@gamingpanther7773 Жыл бұрын

@@wordytoed9887 If it is followed by whole genome the problem is solved. Think a plant AA is hybridise with BB. The new plant AB is sterile and can multiply just by vegitative propagation but not seed. But if the whole genome in duplicated it becomes AABB and problem is solved. Modern wheat has duplicated genome of 3 grasses so they are allohexaploid, like AABBCC.

@slimjimshady0 Жыл бұрын

That art of the plants growing out of the sauropod skull goes HARD

@psilocylence Жыл бұрын

Plants are marvelous beings. The fact that some of them can grow from a cut node, or even a single leaf is nothing short of amazing

@baishalideb5565 10 ай бұрын

infact many of them

@SweetBerryWine3000 Жыл бұрын

More plant content please! This was absolutely fascinating! I've always wondered how plants made it through the K-Pg extinction event. Thank you evolution and polyploidy. And great job as always PBS Eons. ❤🌱❤

@FishHeadSalad Жыл бұрын

Agreed. I always assumed that since seeds and plant spores can lay dormant for decades and beyond yet still stay viable, that that was how trees survived.

@scvcebc Жыл бұрын

@@FishHeadSalad All that dust and ash probably took a long time to settle, so there may have been hundreds of years of dimmer light and cooler temperatures. Some American Chestnut trees have been sprouting from old roots for a hundred years now, the leaves and branches keep getting killed by the Chestnut Blight, but each year, just enough energy gets back down to the roots to try again the following year. So some trees might have been able to hang on until enough light returned to allow real growth again.

@BrianEthridge-wk6hz Жыл бұрын

I just figured it didn't get all the seeds, and they survived that way. I didn't figure it was this complex so to speak. A seed is way more prone to survive high temperatures than flesh or a plant.

@kimwasalreadytaken Жыл бұрын

I just want to take a moment to say thank you for adding proper subtitles! It means a lot to those of us who rely on subtitles to fully understand and enjoy the video. It's appreciated. Thank you.

@earthknight60 Жыл бұрын

Many ferns have extremely large genomes and have long been assumed to have gone through several genome duplicating events. Polyploidy is not just limited to angiosperms. Recent work by Cheng, et al 2023, *Revisiting ancient polyploidy in leptosporangiate ferns*, investigates this in more detail.

@arta.xshaca Жыл бұрын

"leptosporangiate" what does that mean? I know the sporangium but what does this technical term mean?

@earthknight60 Жыл бұрын

@@arta.xshaca "The Polypodiidae, commonly called leptosporangiate ferns, formerly Leptosporangiatae, are one of four subclasses of ferns, and the largest of these, being the largest group of living ferns, including some 11,000 species worldwide." What you get if you look it up.

@ironsnowflake1076 Жыл бұрын

Yet my plants struggle to survive me..... great vid as always.

@B2WM Жыл бұрын

We are more deadly than the meteor, at least to plants.

@kellydalstok8900 Жыл бұрын

You don’t have a garden? Because some weeds can survive just about everything you throw at them.

@B2WM Жыл бұрын

@@kellydalstok8900 True, dandelions are floral cockroaches. (And even those can get patchy in my lawn.)

@Gr_ub Жыл бұрын

I study plant genetics and diseases and love when you guys do plant videos! Any chance we could get a video about ancient plant pathology??

@LeoDomitrix Жыл бұрын

Adding my vote to that! Grew up on a farm, so plant ailments were always something we were aware of...

@brittaistheworst7523 Жыл бұрын

I would unironically love a video about the history of bananas

@user-yw9mw9hv8o Жыл бұрын

Photosynthesizers are the basis of nearly all ecosystems, they deserve more credit. Cyanobacteria really sent earth on the path to becoming what it is today. Plants are the most strange and fascinating to me. Everytime we talk about eukaryotes we mention how amazing mitochondria are and where they came from, but plants did the endosymbiont thing twice!!! Lastly, Lichens, they're really overlooked too for how fundamentally incredible they are as composite organisms. Love the plant episodes! (Even if they include record numbers of nonsense 3D renditions of DNA)

@akumaking1 Жыл бұрын

“Life, uh, finds a way”.

@TragoudistrosMPH Жыл бұрын

🧬🧬 - we agree

@christopherb8017 Жыл бұрын

Polyploidy (at least an initial tetraploidization event) are often also seen in many tumour types (e.g. ovarian, esophageal cancer etc.) for largely the same reason. There ain't no meteors hitting the tumour, but it helps them grow out and evolve. Your channel is ⚡⚡⚡

@Uluwehi_Knecht Жыл бұрын

Colchicine has been used to induce polyploidy in agricultural and ornamental crop breeding, and is still used today to treat gout. Today the herbicide Oryzalin is favoured for the former as it is comparatively less dangerous to human cells than colchicine. I wonder if there is anything interesting going on there with tumour development?

@tuckercaldwell4965 Жыл бұрын

It blows my mind how much we've been able to learn about history in deep-time through genetics in recent years. More plant content please!!!

@aplaceinthestars3207 Жыл бұрын

I wasn't expecting a double-dose of DNA to be the answer to the video's tagline. It was fascinating though a little complex, so I hope there's more plant videos lined up!

@TonyNaggs Жыл бұрын

Thanks for explaining polyploidy!

@yomogami4561 Жыл бұрын

glad to see this as i've always wondered how plants were around after the extinction event and also how herbivores survived after the event

@scvcebc Жыл бұрын

Most of the surviving land animals were small generalists that could eat seeds and/or insects. The insects were often detritus consumers.

@yomogami4561 Жыл бұрын

@@scvcebc true but descriptions of the devastation made it seem like nothing could survive the 'darkness' except maybe lichens and fungus. i've always doubted that for others to survive

@Games_and_Music Жыл бұрын

I welcome more plant videos! These are too rare, compared to the animal videos in general. Would love to see videos detailing the evolution of many species of plants and fungi, because usually we only get a compilation or one-off and that should keep us busy for some years. Chris Packham used to have a great show called "Secrets of Our Living Planet" and it had a great mixture of animals and plants and the workings of the planet combined.

@Jamachlee Жыл бұрын

I love how much Kallie always appreciates the jokes at the end! She always gets so tickled 🥰

@jso6790 Жыл бұрын

I had the exact same thought at the end of this video.

@MaddoxLightning Жыл бұрын

Thank you again for recognizing native people communities and land.

@patrickmccurry1563 Жыл бұрын

It is interesting to imagine how different of a plant environment the non-avian dinosaurs lived among.

@astick5249 Жыл бұрын

For one grass wasn't widespread. Grass is like how we view mammals after the extinction of the non avian dinosaurs: completely taking the place of their forbearers and becoming widespread everywhere

@chheinrich8486 Жыл бұрын

No emviroment we have today would looks like somehing a dinosaurs would have seen at least not completely

@brad9189 Жыл бұрын

@@astick5249 I always wonder, before grasses, what plants occupied an environment like the Great Plains? There must have been habitats like this, with similar temperatures and rainfall. What plants grew there, and what animals ate them?

@astick5249 Жыл бұрын

@@brad9189 I think a big reason many grasslands were around were simply because they are the only ones able to survive being so heavily eaten, basically their very predators helping them remain widespread, otherwise i think it was ferns and stuff that covered the ground, grass is one of a kind.

@aengor Жыл бұрын

@@astick5249 it’s not just that grass wasn’t widespread; for most, if not all, of the dinosaur times grass did not exist at all.

@miketacos9034 Жыл бұрын

This is one of those questions you never think to ask, but then wonder how you never thought to ask it.

@ernestonasution8693 9 ай бұрын

Greetings from Nashville🙏 I'm 20 years old now, and I've loved watching these videos since I was 14. I wonder what percentage of the viewers here are/were researchers in anthropology, paleontology etc. Thank you, PBS Eons, for fueling my fascination!

@larsnielsen1606 Жыл бұрын

This has been my favorite of all PBS Eons videos. Thank you for the curation of such interesting material. Thank you for the presentation style. It is something that my whole family enjoys.

@piotrkowalewski1111 Жыл бұрын

Thank you so much for today's episode! Your videos about plant evolution are inspiring me during my environmental classes with children!

@TheDanEdwards Жыл бұрын

Polyploidy is very common in plants even today. Many of the ornamentals we enjoy are recent polyploids.

@corkinsme09 Жыл бұрын

I study amphibians so can't speak for plants, but in amphibians and fish polyploidy is found everywhere. In many organisms they are far enough away form the event that the chromosomes have fused. However, it is hard to find an organisms that does not have some chromosomal duplication. Mammals are weird in that they largely don't have a large genome duplication in their recent evolutionary past.

@placidpond Жыл бұрын

Cavendish banana is triploid

@noelanderson969 Жыл бұрын

Even on City streets, they THRIVE!!

@johnelliott7850 Жыл бұрын

Nice to see a video about an issue affecting plants (instead of yet more animal stuff).

@martoneduard Жыл бұрын

Finally an answer to my never ending question!

@chrisp7641 Жыл бұрын

Is there a way to do a "what if" episode? Basically what would have happened if that meteorite hit the deepest part of the ocean? Like our current Mariana trench.

@KimberlyGreen Жыл бұрын

I wonder if polyploid plants would, someday, be useful for terraforming activities on other celestial bodies 🤔

@starcrib Жыл бұрын

I absolutely believe that to be so. You're instinctively right. 🟧♾️🟧

@UniDocs_Mahapushpa_Cyavana Жыл бұрын

Or *just for* agriculture. 🌱🌱🪴🪴

@starcrib Жыл бұрын

@Mahapushpa Cyavana indeed- ! and perhaps already has. 🌱🤔 🌾

@joey2765 Жыл бұрын

Why do you look young and old at the same time

@patreekotime4578 Жыл бұрын

@@joey2765 double genome, obviously.

@xxx_putin_has_a_flaccid_pe5374 Жыл бұрын

Horticulturist here, and I really wish y’all would do plant videos more!

@t1sk1jukka Жыл бұрын

Nice vid. We def need more vids of paleobotany. Though I’m more fascinated with fungi than plants and craving more fungi content on YT lol

@damonroberts7372 Жыл бұрын

Thanks for the paleobotany content! I know dinosaurs and the cenozoic megafauna are exciting, but there's no ecology without plants.

@SurfbyShootin Жыл бұрын

PBS Eons always delivers the goods!

@samanthazeiger1553 Жыл бұрын

The alliteration in this script is 👌👌👌

@brendali5888 5 ай бұрын

So grateful for this video. More plant adaptation videos please.

@FRMJD1996 Жыл бұрын

Abilities and Events such as these, are what I am referring to when I think about real magic. I never knew about this before your video and it is utterly amazing. What also strikes me about it, and something I am a little surprised that you didn't make note of, is how this did not only save these plants from annihilation. That in fact, in the aftermath of the Extinction Event, this must have allowed the surviving animals such a reprieve by allowing herbivores to have some food sources once again and subsequently the surviving carnivores as well. To think how this must have played such an integral role, if not a decisive one, in the survival of so many lineages of life following the KT event. Astonishing, Absolutely Astonishing🤩

@TheRopeAddict Жыл бұрын

This show is terrific!

@AuthenticDarren Жыл бұрын

Plants are a most important form of life on Earth. And they don't need other forms of life to survive (for the mostpart) like animals do. They're definitely worth looking at far more. They're clearly survivors. I'd like to hear some more about plants.

@villager736 Жыл бұрын

Cyanobacteria are superior

@stefanostokatlidis4861 Жыл бұрын

Most plants need fungi to survive on land, and many of them today need animals too.

@villager736 Жыл бұрын

@@stefanostokatlidis4861 True, but without cyanobacteria we would not have any oxygenic photosynthetic life, (plants, seaweeds, and algae), meaning life would still be stuck huddling around hydrothermal vents. Not to mention the fact that they generated the oxygen to make multicellular life seen possible in the first place.

@AuthenticDarren Жыл бұрын

@@villager736 Imagine then, another world where an intelligent form of life nourished itself in the same way as what we call extremophiles or cyanobacteria do. It would certainly cut down on life support costs for their space flights.

@villager736 Жыл бұрын

@@AuthenticDarren Actually in a weird kind of way, we are actually extremophiles. Extremophiles that could tolerate oxygen far better then other forms of life.

@nothanks800 Жыл бұрын

One of my favorite channels and presenters on KZfaq. Keep it up all!

@newyorknewart Жыл бұрын

OUTSTANDING EPISODE! I REALLY LIKED GOING BROADER THAN JUST DINO'S, ANIMALS, INSECTS AND REPTILES. PLANT EVOLUTION IS FAR MORE INTRESTING AND UNIVERSAL. AND YOU ARE MY FAVORITE PBS EONS HOST! 🥰😇😁

@punditgi Жыл бұрын

My favorite presenter of all time! She rocks the casbah! ❤😊

@NexuJin Жыл бұрын

I love to watch PBS Eons before sleeping. The narration is calming to listen to with interesting knowledge.

@SirDarthDragon Жыл бұрын

I+d liked more explanation of tangential procecees: - why is polyloidery normaly a disadvantage? how does shade avoidance work? I usually have more problems following your paleobotanist videos. still love ya all

@Pottery4Life Жыл бұрын

Great episode, Kallie! Thank you so much.

@monniemo813 Жыл бұрын

More plant evolution please ❤

@Snittyguy Жыл бұрын

This is my favourite format of your videos.

@rcarter6541 Жыл бұрын

Absolutely fascinating! Are there any animals that also show this kind gene duplication from that time?

@objetivista686 Жыл бұрын

There are 40 humans found that are chimeras too. Considered very rare for us. Search on google. There are some interesting cases.

@bigpurplepops Жыл бұрын

There are several, the best example off my head would be goldfish; which is why you can go from a 6lb coi to a bulb-eyed floaty spec.

@trekpac2 8 ай бұрын

Polyploidy even shows up in our own bodies, where the heart and smooth call walls of vessels are tetraploidies.

@helenofargos Жыл бұрын

Wanted to pop into the comments for a sec to say that the editor/animator did a great job on this episode! Those visuals really helped connect the dots in places where the concepts were a bit harder for someone who barely passed bio (roughly 12 years ago...yikes) to keep up with easily.

@jeffreycarman2185 10 ай бұрын

How interesting! Thanks for the video!

@guilhermebueno7282 Жыл бұрын

the pun at the end is always a challenge, but necessary for complete knowledge

@Alice_Walker Жыл бұрын

I loved this video! So cool!!

@SirLongBongFatRipps 5 ай бұрын

" It's cold and ark. Ash and dust cloud the air, blocking out the sun" is going in my new metal song

@SakuraAsranArt Жыл бұрын

"Watcha doing?" "Nothing much, just doubling my DNA"

@Mesoblunt Жыл бұрын

One of my favorite channels on YT

@annasfischer Жыл бұрын

I would like to second the call from more plant content, and possibly even suggest a topic, because I would like to hear about the evolution of grasses (and also the eco systems they create!). Great video as always!

@mikaljan Жыл бұрын

one of my favorite channels

@Rebel7284 Жыл бұрын

Any thoughts about why it's so common in plants and yet so uncommon in animals if it can offer such important advantages?

@hopsiepike Жыл бұрын

Animal development is more sensitive to gene dosage, that is, the relative amounts of different alleles if the same gene. Polyploidy messes with these ratios.

@billallen2543 Жыл бұрын

Great episode. In my days as a Ag-Biotech researcher I was always amazed that polyploidy even existed. In animals, to my knowledge, it is unheard of as a normal condition (please correct me if I'm wrong. I'd love to know of a polyploid animal). In most cases the duplication of even one chromosome in an animal is devastating and often lethal. There are many human pathologies that result from the duplication of a relatively small portion of a single chromosome. As a classically trained zoologist who took up plant study because I needed a job, I found plants to be absolutely amazing. Hope to see more on plant evolution in the future! BTW, my crop specialty was corn, always was in awe of the wheat geneticists.

@mariusstrand5220 Жыл бұрын

It is definitely rarer for animals to be polyploid than plants. Still, we know of several paleopolyploidization events in animals. It is more or less consensus that two rounds of whole genome duplication (WGD) occurred in the ancestor or all vertebrates (jawed ones at least). You can look up the '2R hypothesis'. From the top of my head, I can also mention that teleosts (96% of all fish) had a third round of WGD, and salmonids as well as carps each had a fourth round on top of that. I know fishes best, but beyond that, there are many examples in everything from amphibians to insects.

@jasN86 Жыл бұрын

I've always looked at plants learning to evolve, and the already well established mushroom kingdom, and can't help but ponder about a possible connection

@mellissadalby1402 Жыл бұрын

Very cool episode!

@dynojackal1911 Жыл бұрын

Would you consider a video looking at gingkoes and their extinct relatives?

@e-nana2774 Жыл бұрын

Yes please

@aplaceinthestars3207 Жыл бұрын

Yes please +2

@avitalzehava5747 Жыл бұрын

Thank y'all for the wonderful content as always ❤

@rstevewarmorycom Жыл бұрын

Polyploidy happened twice for our ancestor Pikaia in the Cambrian, likely leading to greater complexity and adaptation of all vertebrate animals like us!!

@proximacentaur1654 Жыл бұрын

Super interesting. More on plant genomics please!

@bjarkeziegler7295 Жыл бұрын

Loved this episode 😊

@webheadwonder9597 Жыл бұрын

I'm waiting for a host to say 'niche' three different ways during a video to see if anyone notices...

@gailaltschwager7377 Жыл бұрын

Thank you!

@paulwallis7586 Жыл бұрын

Reminds me of the "junk DNA" thing; Why anyone would assume DNA has no use is pretty hard to understand.

@NexuJin Жыл бұрын

The way I see it is part of DNA are like main program data, where as the "junk DNA" are more just data, like assets or extra sub-routines. I just watched Picard S3E9.

@paulwallis7586 Жыл бұрын

@@NexuJin Well, if you're prepared to duplicate a genome, that DNA seems to be useful, doesn't it?

@a787fxr Жыл бұрын

I really liked this one. Thanks. 💯

@michaelteret4763 Жыл бұрын

Please do a few episodes on ferns!

@bjdefilippo447 Жыл бұрын

Fascinating! it's a smart strategy that makes you wonder about how the trigger functions.

@johnwalters1341 Жыл бұрын

A very interesting episode. It leaves one big question unanswered, though: Why is polyploidy almost universally fatal in animals?

@incyray9709 Жыл бұрын

Wonderful video! I had always wondered how plants survived the cretaceous extinction, AND why strawberries and other plants have SO MANY CHROMOSOMES, and you just answered both questions! fascinating that they are so related!

@emilycasanova8512 Жыл бұрын

Genes retained after WGD are often developmental genes, which are usually more dosage sensitive, so even losing them (despite being a homolog) can still be detrimental. So, it's not always immediately about "advantage" but "avoiding disadvantage."

@stonefish1318 Жыл бұрын

More plant evolution please! 😃 🌵🌾🌲 These 3 would be maybe interesting 🤔

@grokeffer6226 Жыл бұрын

Fascinating stuff. 🌱🌿🍃

@suchendelokidottir5673 Жыл бұрын

This video helped me to resolve an issue with the world building in my fantasy novel I'm working on. I love when science solves a problem for me.

@lizzykayOT7 Жыл бұрын

Very cool episode, as fellow descendants of cataclysmic events, it's interesting to see how different species adapted.

@idkidk8278 Жыл бұрын

Very interesting thanks!

@rJaune Жыл бұрын

Wow, seeing the affected genes match to the environmental conditions at the time is fascinating!

@vanishingfolklore Жыл бұрын

What a concept

@jso6790 Жыл бұрын

This is so cool and fascinating, especially since the plants the group studied are those that humans have genetically modified through selective breeding, as well. It makes one wonder if the success humans had in breeding corn, for example, into the size it is today was related to the existence of those additional genes.

@dzimidrol475 Жыл бұрын

But is it still thought that the plants had to survive without photosynthesis for multiple years after the impact?

@PeterSedesse Жыл бұрын

A lot of seeds only germinate in the presence of sunlight. It also could have been dry until sunlight came back.

@alexallen9640 Жыл бұрын

Interesting and fitting video for today 🙂👍🌿

@moukidelmar Жыл бұрын

This is really interesting, though I would like a follow-up video on how gymnosperms survived and, particularly, how living fossils like Ginkgos, Horsetails, Treeferns, Cycads, and so on pulled through

@NumbuhONE Жыл бұрын

You're my favorite host! Wish you could do all the videos lol

@KendrixTermina Жыл бұрын

this is so cool

@helmutzollner5496 Жыл бұрын

Amazing!

@firebladetenn6633 Жыл бұрын

I've always wondered this...

@christmassnow3465 Жыл бұрын

More about evolution: How did the earliest plants evolve from producing spores to flowering and producing seeds?

@invisiblejaguar1 Жыл бұрын

That's a beautiful picture of those plants growing out of that alamosaurus skull.

@PrettyBluePenguin Жыл бұрын

More plant evolution please!

@pollytiks3885 Жыл бұрын

Where else can you hear 20 million years ago as being “recent”? 🤔 😂😮

@FloozieOne Жыл бұрын

Plants are awesome and we never give them the attention and respect they deserve. After all, without them Earth would still be a barren lifeless world. Could you do another episode on which plants survived vs. ones that went extinct and what current plants are descendants of those survivors?