Episode 158 · September 17, 2022
Mommy and Daddy Trees
The hosts ask how seedless fruit exists and learn it's mostly mutations, cuttings and grafting.
“It can't have babies. You can have a very pleasurable sexual life, but it can't have babies.” (02:26)
Questions
How can there be seedless fruit, and how does it reproduce? (00:39)
Our guess
Crossbreeding and genetic engineering produce seedless fruit, and clones keep the plants going.
Crossbreeding and genetic engineering produce seedless fruit, and clones keep the plants going.
Reveal the answer
The answer
Seedless grapes began as a natural mutation (known since ancient Rome) and fruit plants are propagated from cuttings or grafting, so they are genetic clones. Seedless watermelons are triploid (three sets of chromosomes) from crossing a diploid with a tetraploid, which makes them unable to reproduce.
Seedless grapes began as a natural mutation (known since ancient Rome) and fruit plants are propagated from cuttings or grafting, so they are genetic clones. Seedless watermelons are triploid (three sets of chromosomes) from crossing a diploid with a tetraploid, which makes them unable to reproduce.
Verdict right
Transcript (auto-generated)
[00:05] Oh, we doing under Google rules. That was the plan. Super excited. Told us we had to. We [00:20] signed up for it. In the end, it's going to be better and more true than Google can give [00:26] you. All right. Coalson. I need an under Google in my life. Do you have anything for me today [00:34] that I can answer for you? I do. I've got a long list right now. But the one that's [00:39] most pressing to me that, you know, if I don't get answered soon enough, it's going to start [00:45] to freak me out. I want to talk about seedless fruits. I want to talk about how they exist. [00:54] My understanding of fruits is that they have seeds and that's how they produce other fruits. [01:00] And so if I am getting like a grape, right, where I'm eating my grape and it's got no [01:06] seeds in it, then how is it reproducing? Also, how are you making something that can't reproduce [01:13] seedless fruits? Why do they exist? How do they make this happen? So the answer to your [01:19] first question, why is because seeds are annoying. And so that's why. And also money. Yes. What [01:30] do you mean money? Well, because they suck. I don't want them in my food. I'll pay more [01:34] to not have them in my food. Okay. Yeah. You can sell multiple products, right? Yeah. Okay. [01:41] And then I don't, my knowledge of plants reproduction is not where it used to be. But I think the [01:50] idea is that you create a cross between two parent plants that have seeds, but their progeny [02:04] do not have seeds. And so you, but how do you know? Experimentation. Yeah. I mean, luckily [02:12] plants don't take 90 years to go through a life cycle like we do, right? It happens [02:17] relative quickly. So, so you say you could have two plants have sex and give you a seedless [02:26] thing, but that seedless thing can't have sex. I mean, it can, uh, you know, it just [02:34] can't have, it can't have free babies. You can have sex. It can't have babies. You can [02:37] have a very pleasurable sexual life, but it can't have babies. Very fulfilling. Right. [02:43] Exactly. All of the pollen. We support you. Yeah. But, but, uh, so what you're saying [02:49] is that the, the, the boy, the boy tree and the girl tree, I don't know. Have sex [02:56] and they have a, a, a genderless sexless baby. No seeds, no seeds. Now, do you just keep [03:06] making those, those mommy and daddy trees having sex over and over again, or do you have like [03:13] the sexless, like I actually, you can't, cause once the berries out there without a, like [03:20] a, a sex organ, it can't have sex. Like what happens when the, the, the, the boy tree and [03:30] the, and the, the girl tree die? Well, so these days you would just do, you would, you [03:35] would genetically engineer your, your, your F zero generation. So the parent generation [03:47] to produce, how would this work? It's a produce offspring that we're not seed bearing. Right. [03:58] So do you have, okay. So, okay. This is a weird question, but do you have to find like the [04:03] smallest seed grapes on either side of the male and female thing and be like, oh yeah, [04:09] they produce small seed grapes and connect them and keep getting smaller and smaller. I [04:13] probably that's how it started. Yeah. Is, I mean, that's sort of the, the nature of crop [04:22] breeding, right? Is you're going to cross different crops with, with properties that [04:28] you want. Right. So you said crossbreeding and I said evolution. So is that different? [04:33] Well, so crossbreeding is probably, I mean, I guess it's not an accelerated version of [04:40] evolution, but it's, it's guided, trait. It's breeding. It's like dogs. Dogs aren't really [04:50] evolving and just forced their breeding habits. Yeah. That's a good analogy. Yep. Okay. So, [04:56] so yeah, I guess you would take, if you like, if you want a smaller dog, you take two small [05:00] dogs and have them enjoy each other, be a smaller dog, right? Yeah. So the same thing [05:06] with the, the plants like, Hey, you have smaller seeds. Let's have you guys keep having sex. [05:11] I mean, these days we're probably talking about full blown genetic engineering, aren't we? [05:14] We're just going in there and splicing stuff up. That's what my guess would be is that [05:18] at this point, like the way like Monsanto makes like the, the Roundup ready corn or [05:25] whatever, but that corn cannot propagate itself. And that's the whole trick is Monsanto has [05:31] you come by the stuff every year. Right. So that's what are they getting that from active [05:37] plants somewhere, right? Or they're just genetically creating it in a lab. I mean, [05:43] both, right? Like you need the actual plants, but you have genetically engineered the plants to do [05:48] what you want them to do to produce progeny that don't, uh, that are unable to replicate. [05:56] Okay. So here's a, here'd be another question. So like a cutie, are you familiar with the cutie? [06:01] It's like a tiny orange. Look at the club. Oh, nevermind. [06:07] It's like a tiny orange cutie didn't have seeds. Orange has seeds. So did they create a small [06:13] orange without seeds? Yes. And that's why it's called a cutie. And they did that. It's called [06:19] the cutie because somebody marketing thought it would be right. But what I'm saying is they took [06:23] a bunch of orange plants and was like, you don't have that many seeds. You don't have that many [06:28] seeds either baby. And they just all like, you know, fell in love and had babies. [06:34] Yeah. Yeah. Yeah. Exactly. And the store came or something. I don't know. [06:38] I feel like you are probably writing some fiction and dark corners of the internet. [06:44] I'm just trying to figure this is, this is the history of agriculture. Coalson is, [06:49] is people see that help crossing plants in order to get, uh, ones that bear larger fruit or [06:55] fruits without seeds or fruit that are actually red or green or our college, my college roommate [07:02] married a gal whose family, great, great, great grandfather or something pioneered [07:07] multi-eared corn. There used to be like one year of corn per stock. And that's not enough. [07:13] And then someone need more than that. Someone bred, uh, uh, you know, [07:17] Australian that would do more and got very rich. Right. I guess, I guess, and I, and I'm with you [07:22] and I, I, and I appreciate that understanding of, of how we've gotten to this place. [07:27] It's a pretty mellow strain of corn. I think it's a good list. [07:31] But my, but my question is, if you stop having seeds, you can't replant that thing. [07:36] Right. Right. I see what you're saying. So for all of these, it all dies out, right? [07:41] Yeah. So for all of these other ones, you can make it in bed, have sex with a, [07:44] you know, dorm room pincher and they create something different, [07:47] right? But like now I've got seedless things. How do I keep them alive? [07:52] You just need, yeah, you just need clones of the seeds that you used originally, right? [07:59] But were we able to do this before we could clone things? I guess what I'm saying. [08:06] I mean, plants probably. What's your first seedless cherry? [08:11] You know, do they make seedless cherries? Hell yeah, they do. [08:16] Do they? Really? I didn't know that. [08:18] I was also unaware of that. Apparently I'm not in that tax bracket. [08:22] Yeah. You know that the maraschino cherries just have the seeds already removed. [08:30] Those aren't seedless cherries. Oh, I just thought those were, I thought those were candy. [08:36] I thought it was that I didn't think that was a cherry. [08:39] Just a candy. I mean, also seedless grapes may not be a zero number of seeds, right? [08:45] It's just an imperceptibly small amount of seeds, right? [08:49] That's a good point. Yeah. Which is what she said. [08:54] I don't think she did. What he said. I don't know. [08:58] He might have. Your doctor might have said that. [09:03] Before I started warning. They're supposed to be some sort of HIPAA thing here. [09:14] You don't share all my public information between the enforcer and his patient. I don't think. [09:20] If you can tell me what HIPAA stands for, I'll observe something about a [09:28] Hippocratic oath nailed it from Hippocrates. [09:42] So it turns out most commercial fruit isn't grown from seed. [09:49] What even fruits that still have seeds like apples and cherries are grown from cuttings [09:54] because this guarantees that the plant will be genetically identical to the parent plant [09:59] from which they are clumped. So very clever farmers. See this. [10:09] So you can clip off part of a plant and then replant it. [10:13] Right. Is that like grafting onto another tree? [10:19] More like cutting off part of a starfish and it grows that part back. [10:24] But no, you can. Yeah, you can take part of a plant and it will, you know, [10:31] you can get it to grow from there. You don't need the entire plant, right? [10:35] So you can use some subset called a clipping to replant that that plant and it will grow [10:43] to maturity plants. Just want to live. Seedless grapes were were originally [10:48] a natural mutation that prevented the young seeds from maturing and developing a hard coat. [10:55] And even seedless varieties do sometimes produce small numbers of seeds. [11:00] Fruits develop without fertilization or pollination triggers fruit development, [11:05] but the ovules and embryos abort without producing mature seeds. [11:16] Yeah. Okay. Lacking seeds. Fruits are generally propagated [11:23] vegetally from cuttings or grafting. Like you said, [11:30] the seedless grape. I don't know. I don't know how reliable this is going to be [11:35] because it's from a for profit company, it looks like. But the seedless grape is thought to date [11:40] back to ancient Rome and was first introduced to the U.S. in the mid 1870s under the name [11:46] Thompson, a Scottish immigrant who first cultivated it for raisin production [11:50] for seedless watermelons. They did sort of what our plan was. So, but the, the science of it is [12:01] they, they have a normal watermelon plant that has is diploid. So it has two sets of chromosomes [12:11] and then a, they cross it with a variety that has four sets of chromosomes. [12:17] And so then they end up with a triploid one that has three sets of chromosomes that are unable to [12:28] reproduce. And so they make seedless watermelons. [12:32] Yeah. I've seen a lot about things that aren't able to reproduce. Now, it seems like these have [12:38] been around for a lever because they happen naturally, but we've figured out how to make [12:42] them artificially. So that's, yeah. And then we do that for profit. You're right. Money. [12:47] Yeah. And the grafting actually, yeah, we should have thought of grafting. We should have. That's [12:51] like, like all the almonds basically in the world are just grafted onto a different type [12:57] of tree stump or something like that. And then there's that like cool hybrid plant that like [13:05] grows tomatoes on top and potatoes on the bottom or whatever. It's supposed to like save the [13:09] world at some point. Still, still waiting for that. No, it exists. It's a thing for the [13:15] world to be saved. That's why. Yes. Yeah. We got to go through the apocalypse first. Okay. And then [13:25] we get the tomato, tomato, potato, potato, that everybody has to yell about. There's nobody knows [13:31] the answer to what it's over and over and over again. That's just now it's got a different human [13:35] history. Tomato, potato. Jason, you're talking about the tom-tato plant. Yeah, the tom-tato. [13:43] Better than tobacco. Yes, better than tobacco. [13:49] Is that a sentence? But it's so addictive. [13:54] I'll take a crate or a carton, however they come.