Stefano Mancuso The roots of plant intelligence
About this talk
Plants behave in some oddly intelligent ways: fighting predators, maximizing food opportunities … But can we think of them as actually having a form of intelligence of their own? Italian botanist Stefano Mancuso presents intriguing evidence.
About Stefano Mancuso
Stefano Mancuso is a founder of the study of plant neurobiology, which explores signaling and communication at all levels of biological organization, from genetics to molecules, cells and ecological… Full bio and more links
Why you should listen to him:
Does the Boston fern you’re dutifully misting each morning appreciate your care? Or can the spreading oak in your local park take umbrage at the kids climbing its knotted branches? Not likely, says Italian researcher Stefano Mancuso, but that doesn’t mean that these same living organisms aren’t capable of incredibly sophisticated and dynamic forms of awareness and communication.
From his laboratory near Florence, Mancuso and his team explore how plants communicate, or “signal,” with each other, using a complex internal analysis system to find nutrients, spread their species and even defend themselves against predators. Their research continues to transform our view of plants from simple organisms to complex ecological structures and communities that can gather, process and — most incredibly — share important information.
“To christen the lab in 2004, Mancuso decided to use the controversial term ‘plant neurobiology’ to reinforce the idea that plants have biochemistry, cell biology and electrophysiology similar to the human nervous system.”
Nicole Martinelli, Wired.com
我们来看看这部很棒的法典，这是来自于文艺复兴时期的书。我们可以看到这个自然界层级的图。这是一个不错的图，因为从左边开始是石头，石头之后随之就是植物，它们只是能活着，我们动物则能够存活和感觉在金字塔顶端的是人类，不是一般的人类，是“智人”，有学习能力的人对像我这样的人来说，这。。相当令人欣慰。我是一个教授，在天地万物的顶端，但这是完全错误的看法。你们对教授所知甚详，但对植物的看法也是错的。因为植物不仅能够生存，也能够感觉。它们的感觉比动物精密得多，给你们看个例子。每一个根尖，都能同时且持续的侦测和监测至少15种不同的化学和物理参数，它们还能够显示和展示出这样神奇。和复杂的行为，可用聪明绝顶这个字眼来形容嗯，但这是某种 – 这种对植物的低估，是一直伴随着我们的观念。
现在，在这一切我们所目睹的行为背后，有个很大的疑问;？。没有大脑怎么可能做到这一切直到1880年，这个伟大的人 – 查尔斯达尔文出版了一本精彩且惊人的书，开启了一场革命，书名是“植物运动的力量。”在达尔文之前，没有任何人能够谈论植物的运动。他的书由儿子佛朗西斯协助，他是世上第一个植物生理学教授，任教于剑桥。他们在长达500页的篇幅中讨论植物每一个动作。书中最后一章，这是一种标志性的文章格式，因为达尔文通常在书中最后一章放上最重要的信息。他写道， “这么说毫不夸张。胚根尖端作用就像一个低层级动物的大脑。”这不是比喻，他写了一些非常有趣的信给他一位朋友虎克，他是当时英国皇家学会主席因此，英国最高科学权威谈论了植物的大脑。
Sometimes I go browsing [through] a very old magazine. I found this observation test about the story of the ark. And the artist that drew this observation test did some errors, had some mistakes. There are more or less 12 mistakes. Some of them are very easy. There is a funnel, an aerial part, a lamp and clockwork key on the ark. Some of them are about the animals, the number. But there is a much fundamental mistake in the overall story of the ark that’s not reported here. And this problem is: where are the plants? So now we have God that is going to submerge Earth permanently, or at least for a very long period, and no one is taking care of plants. Noah needed to take two of every kind of bird, of every kind of animal, of every kind of creature that moves, but no mention about plants. Why? In another part of the same story, all the living creatures are just the living creatures that came out from the ark, so birds, livestock and wild animals. Plants are not living creatures. This is the point. That is a point that is not coming out from the Bible, but it’s something that has always accompanied humanity.
Let’s have a look at this nice code that is coming from a Renaissance book. Here we have the description of the order of nature. It’s a nice description because it’s starting from left — you have the stones — immediately after the stones, the plants that are just able to live. We have the animals that are able to live and to sense, and, on the top of the pyramid, there is the man. This is not the common man. The “Homo studiosus” — the studying man. This is quite comforting for people like me — I’m a professor — this to be over there on the top of creation. But it’s something completely wrong. You know very well about professors. But it’s also wrong about plants, because plants are not just able to live; they are able to sense. They are much more sophisticated in sensing than animals. Just to give you an example, every single root apex is able to detect and to monitor concurrently and continuously at least 15 different chemical and physical parameters. And they also are able to show and to exhibit such a wonderful and complex behavior that can be described just with the term of intelligence. Well, but this is something — this underestimation of plants is something that is always with us.
Let’s have a look at this short movie now. We have David Attenborough. David Attenborough is really a plant lover. He did some of the most beautiful movies about plant behavior. Now, when he speaks about plants, everything is correct. When he speaks about animals, [he] tends to remove the fact that plants exist. The blue whale, the biggest creature that exists on the planet. That is wrong, completely wrong. The blue whale, it’s a dwarf if compared with the real biggest creature that exists on the planet — that is, this wonderful, magnificent Sequoiadendron giganteum. (Applause) And this is a living organism that has a mass of at least 2,000 tons. Now, the story that plants are some low-level organisms has been formalized many times ago by Aristotle, that in “De Anima” — that is a very influential book for Western civilization — wrote that the plants are on the edge between living and not living. They have just a kind of very low-level soul. It’s called the vegetative soul, because they lack movement, and so they don’t need to sense. Let’s see.
Okay, some of the movements of the plants are very well-known. This is a very fast movement. This is a Dionaea, a Venus fly trap hunting snails. Sorry for the snail. This has been something that has been refused for centuries, despite the evidence. No one could say that the plants were able to eat an animal, because it was against the order of nature. But plants are also able to show a lot of movement. Some of them are very well known, like the flowering. It’s just a question to use some techniques like the time lapse. Some of them are much more sophisticated. Look at this young bean that is moving to catch the light every time. And it’s really so graceful. It’s like a dancing angel. They are also able to play. They are really playing. These are young sunflowers, and what they are doing cannot be described with any other terms than playing. They are training themselves, as many young animals do, to the adult life, where they will be called to track the sun all the day. They are able to respond to gravity, of course, so the shoots are growing against the vector of gravity and the roots toward the vector of gravity. But they are also able to sleep. This is one Mimosa pudica. So during the night, they curl the leaves and reduce the movement, and during the day, you have the opening of the leaves — there is much more movement. This is interesting because, this sleeping machinery, it’s perfectly conserved. It’s the same in plants, in insects and in animals. And so if you need to study this sleeping problem, it’s easy to study on plants, for example, than in animals, and it’s much more easy even ethically. It’s a kind of vegetarian experimentation.
Plants are even able to communicate. They are extraordinary communicators. They communicate with other plants. They are able to distinguish kin and non-kin. They communicate with plants and other species, and they communicate with animals by producing chemical volatiles, for example, during the pollination. Now with the pollination, it’s a very serious issue for plants, because they move the pollen from one flower to the other, yet they can not move from one flower to the other. So they need a vector, and this vector, it’s normally an animal. Many insects have been used by plants as vectors for the transport of the pollination, but not just insects; even birds, reptiles, and mammals like bats rats are normally used for the transportation of the pollen. This is a serious business. We have the plants that are giving to the animals a kind of sweet substance — very energizing — having in change this transportation of the pollen. But some plants are manipulating animals, like in the case of orchids that promise sex and nectar and give in change nothing for the transportation of the pollen.
Now, there is a big problem behind all this behavior that we have seen. How is it possible to do this without a brain? We need to wait until 1880, when this big man, Charles Darwin, publishes a wonderful, astonishing book that starts a revolution. The title is “The Power of Movement in Plants.” No one was allowed to speak about movement in plants before Charles Darwin. In his book, assisted by his son, Francis — who was the first professor of plant physiology in the world, in Cambridge — they took into consideration every single movement for 500 pages. And in the last paragraph of the book, it’s a kind of stylistic mark, because normally Charles Darwin stored, in the last paragraph of a book, the most important message. He wrote that, “It’s hardly an exaggeration to say that the tip of the radicle acts like the brain of one of the lower animals.” This is not a metaphor. He wrote some very interesting letters to one of his friends who was J.D. Hooker, or, at that time, president of the Royal Society, so the maximum scientific authority in Britain speaking about the brain in the plants.
Now, this is a root apex growing against a slope. So you can recognize this kind of movement, the same movement that worms, snakes and every animal that [is] moving on the ground without legs is able to display. And it’s not an easy movement, because, to have this kind of movement, you need to move different regions of the root and to synchronize these different regions without having a brain. So we studied the root apex, and we found that there is a specific region that is here, depicted in blue — let’s call it a transition zone. And this region, it’s a very small region. It’s less than one millimeter. And in this small region you have the highest consumption of oxygen in the plants, and more important, you have these kinds of signals here. The signals that you are seeing here are action potential, are the same signals that the neurons of my brain, of our brain, use to exchange information. Now we know that a root apex has just a few hundred cells that show this kind of feature, but we know how big the root apex of a small plant [is], like a plant of rye. We have almost 14 million roots. We have 11 and a half million root apex and a total length of 600 or more kilometers and a very high surface area.
Now let’s imagine that each single root apex is working in network with all the others. Here were have, on the left, the internet and on the right, the root apparatus. They work in the same way. They are a network of small computing machines, working in networks. And why are they so similar? Because they evolved for the same reason: to survive predation. They work in the same way. So you can remove 90 percent of the root apparatus and the plants [continue] to work. You can remove 90 percent of the Internet and it is [continuing] to work. So, a suggestion for the people working with networks: plants are able to give you good suggestions about how to evolve networks.
And another possibility is a technological possibility. Let’s imagine that we can build robots and robots that are inspired by plants. Until now, Man was inspired just by Man or the animals in producing a robot. We have the animaloid — the normal robots inspired by animals, insectoid, so on. We have the androids that are inspired by Man. But why have we not any plantoid? Well, if you want to fly, it’s good that you look at birds, to be inspired by birds. But if you want to explore soils, or if you want to colonize new territory, to best thing that you can do is to be inspired by plants that are masters in doing this. We have another possibility we are working [on] in our lab, [which] is to build hybrids. It’s much more easy to build hybrids. Hybrid means it’s something that’s half living and half machine. It’s much more easy to work with plants than with animals. They have computing power. They have electrical signals. The connection with the machine is much more easy, much more even ethically possible. And these are three possibilities that we are working on to build hybrids, driven by algae or by the leaves at the end, by the most most powerful parts of the plants, by the roots.
Well, thank you for your attention. And before I finish, I would like to reassure that no snails were harmed in making this presentation. Thank you.