字幕列表 影片播放 列印英文字幕 Hi, this is Julián from MinuteEarth. This shrub is super metal. No, literally...it’s a rare, metal-hoarding plant whose bluish-green sap, when dried out, is 25% nickel – that’s ten times more nickel than the typical nickel-containing ore found in nickel mines! In fact, these plants are actually planted in abandoned nickel mines to take the leftover nickel out of the soil, which keeps the toxic metals from leaching into waterways and makes the land viable for other uses like farming. And these metal-hoarding plants are even planted in particularly nickel-rich land, then harvested and processed to extract enough metal to return a profit! ALL plants are able to take some metals up from the soil, after all, they're used in crucial tasks – nickel, for instance, is a critical part of plants’ nitrogen cycle. But, most plants contain less than 0.0005% nickel and similar levels of other metals – any more than that is usually toxic. Surplus nickel inhibits cell division and harms the chlorophyll needed for photosynthesis in leaves – all leading to very dead plants. So how do metal-hoarders survive with 50,000 times the normal amount - and what do they do with it? This isn't just a matter of the plants passively absorbing more metal from nutrient-packed soil. Metal-hoarding plants actively suck in way more metal than normal, and they do so by making a lot more of the special proteins that plants use to take in specific nutrients from the soil. Similar proteins transport the metal up into the leaves and trap it in cordoned off pockets within leaf cells, helping the plant wondrously evade death. Ok, but why the heck do they slurp up so much nickel if they’re just going to pack it away? Maybe other hoarders can give us a clue, like the salt-loving plants that use this same mechanism to hoard salt, another nutrient that generally kills plants at high concentrations. As it turns out, all that hoarded salt attracts more water from the soil, so salt-hoarding is a great adaptation for plants living in drought-prone areas. Meanwhile metal-hoarders use precious plant energy to collect a bunch of metal that seems to just sit there doing nothing...or is it? Scientists believe these super metal plants are (perhaps unsurprisingly) super toxic to some herbivores, which learn to avoid eating them. So plants that can take up toxic metals - and survive - become toxic themselves, without having to expend energy to concoct their own defensive toxins. If you want to be left alone...just turn up the metal. I know what you're thinking, plants hoard metal to defend themselves from herbivores, but what can I use to protect my internet activity from being snooped on? Thankfully, this video is sponsored by the aptly named Private Internet Access, a world-leading VPN that's been around for a decade. Private Internet Access is an excellent option for hiding your IP address and encrypting your internet connection. Plus, because they have the largest server fleet in the world, you can pick your location off a list of over 75 countries! This allows you to browse content on websites that may be blocked in your country. Personally, I use PIA to anonymize my internet traffic and prevent any hackers from snooping on me. Plus, I love having access to shows on my favorite streaming platforms like Netflix or Disney+ from anywhere. Thanks to dedicated apps, you can use PIA on any device and protect up to 10 of them at the same time with just one subscription. If you'd also like to protect your digital life, click on the link in the description to support MinuteEarth and get 3 years of PIA for just $79! - AND get 2 additional months for free. That's just $2.08 per month, a bargain! Thanks, PIA!