14. Cell Signaling
Signaling in Plants
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Hi. In this video, we're gonna be talking about signaling in plants. So signaling evolved differently in plants and animals, and that's the reason why this has the separate video. And so, a lot of the things that we've talked about in animals don't necessarily have similar things in plants or act similar ways. So for instance, plants have receptor kinases like humans, but and mammals and other animals, but their largest class isn't Tyrosine Kinase, which is what I said before, but instead Serine Therenine Kinases. Additionally, plants don't have homologs or similar molecules for things like JAK STAT, which we talked about, but also for ones that we didn't talk about, but are also still really important signaling pathways, things like Notch, Wnt, and Hedgehog. Now, we didn't talk about these because you don't need to know the mechanisms yet. If you take more advanced biology classes, you will need to know these mechanisms, but plants don't have them. And so, that's super important. Now instead, plants have a lot of signaling molecules that animals don't have. So I've bolded and highlighted now the 2 that, you're gonna need to know, and then italicize the ones that are also different, but also aren't as important and you are less likely to be questioned on them. So, the first there are auxins, which stimulate plant growth, and then you have ethylene, shimelites fruit ripening. So, these are the two main ones you are going to want to know. But there's all these other ones as well that, you know, have to do with stem elongation, cell division, cell dormancy, sensing light, you can imagine is super important for plants. So all these signaling molecules are different in plants and very specific for plants, but not animals. So it's all very different in plants. So with that, let's now move on.
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