#### Associations between environmental cues and food are responsible for shaping foraging behaviors in the animal world. ## Are plants also able to acquire learned associations to guide their foraging behavior? While this may sound stranger than fiction, Monica Gagliano, an Australian evolutionary ecologist, and her colleagues found that plants acquire new behaviors to enhance foraging efficiency for light through the learning process of habituation [[1](http://link.springer.com/article/10.1007/s00442-013-2873-7)], and thus to facilitate photosynthesis and growth. However, it remained unknown whether plants can also learn through forming associations [[2](http://www.nature.com/articles/srep38427.epdf?author_access_token=ndXv7HCRrrXgnqZkGRINU9RgN0jAjWel9jnR3ZoTv0PFvNbZvaVrCKW4Rb8ZW14eVyb7xNIHahQoZ-WZXB-uth8RSOQA0pfaOyF6to9zHCjhchoo9tGdx9p0lbntPMnN)]. https://i.imgsafe.org/62901c0044.jpg <center>**Figure 1** - *Pisum* sp. <sub>[source](https://phys.org/news/2016-12-new-study-shows-plants-can.html)</sub></center> After being rejected by a couple of journals, the international research team led by Monica Gagliano, from the University of Western Australia (Centre for Evolutionary Biology), in collaboration with researchers from the Universities of Oxford and Zurich, set out to prove plants were capable of associative learning. In a recently published paper in Nature Scientific Reports: *[Learning by Association in Plants](http://www.nature.com/articles/srep38427.epdf?author_access_token=ndXv7HCRrrXgnqZkGRINU9RgN0jAjWel9jnR3ZoTv0PFvNbZvaVrCKW4Rb8ZW14eVyb7xNIHahQoZ-WZXB-uth8RSOQA0pfaOyF6to9zHCjhchoo9tGdx9p0lbntPMnN)*, they show that this type of learning occurs in the garden pea, *Pisum sativum*. ## How did they test it? <div class="pull-right"> https://i.imgsafe.org/6784650b47.jpg Figure 2 - Pavlov's dog experience <sub> Source: http://www.simplypsychology.org/pavlov.html</sub> </div> Well, they used a classical conditioning, similar to the classic [Pavlov's dog](http://www.simplypsychology.org/pavlov.html) experiment. While Pavlov demonstrated the existence of unconditioned response by presenting a dog with a bowl of meat (reward) and a bell (neutral cue), by measuring its salivary secretions, Gagliano and co-authors used light as a reward and airflow as the cue, by measuring the plants growth. Forty-five pea seedlings (n=45) were entrained to an 8-h ligh/16-h dark cycle for 5–8 days. In the 3 subsequent day training period, they were kept in darkness with the exception of 1-hour light exposures during the three daily training sessions. The trains occurred <br> individually inside a Y-maze, where the airflow produced by a fan (cue as the Conditional Stimulus) and a blue LED light (reward as the Unconditional Stimulus) were systematically presented according to a specific protocol [[2](http://www.nature.com/articles/srep38427.epdf?author_access_token=ndXv7HCRrrXgnqZkGRINU9RgN0jAjWel9jnR3ZoTv0PFvNbZvaVrCKW4Rb8ZW14eVyb7xNIHahQoZ-WZXB-uth8RSOQA0pfaOyF6to9zHCjhchoo9tGdx9p0lbntPMnN)]. https://i.imgsafe.org/68f928d75d.jpg <center> **Figure 3** - Training and testing protocol for associative learning in pea seedlings. <sub> (A) During training seedlings were exposed to the fan and light on either the same arm (i) or on the opposite arm (ii) of the Y-maze. The fan represents the conditioned stimulus (CS), and light the unconditioned stimulus (US). During testing with exposure to the fan alone two categories of responses were distinguished. Correct response: Seedlings growing into the arm of the maze where the light was “predicted” by the fan to occur [green arrow; iii (corresponding to scenario i) and iv (corresponding to scenario ii)]; Incorrect response: Seedlings growing into the arm of the maze where the light was not “predicted” by the fan to occur (black arrow; iii and iv). (B) Seedlings received training for three consecutive days before testing. Each training day consisted of three 2-h training sessions separated by 1-h intervals. The 90-min CS preceded the 60-min US by 60 minutes so that there was a 30-min overlap. (i). During the 1-day testing session, seedlings were exposed to the fan alone for three 90-min sessions (ii). Seedlings of the control group were left undisturbed (no fan, no light; iii).</sub> </center> <br> The results showed the seedlings were able to learn and **choose** the best growth direction for survival. Trained plants conditioned by the fan would grow towards the source of the airflow even when the light was not present, by other words, they were able to correctly **predict** the occurrence of light once it was removed. #### Gagliano has shown with this experience that plants don't just respond to light and food in order to survive, they also choose and predict!! ### They conclude that associative learning is an essential component of plant behavior, representing a universal adaptive mechanism shared by both animals and plants. > *Because our findings are unexpected, we anticipate that this study will stir a lively and exciting debate on the origin and properties of memory, learning and ultimately intelligent behavior in biological systems* <sub>(Monica Gagliano)</sub> ---- <div class="pull-left"> https://i.imgsafe.org/6645867132.jpg </div> A fresh new book has been recently published and it explores the idea that plants can think, feel, and communicate. Reuniting the latest developments in evolutionary ecology, the philosophy of biology and ecocritical theory, [*The Language of Plants*](https://www.upress.umn.edu/book-division/books/the-language-of-plants) promotes the freedom of imagination necessary to reconsider our relation to the vegetal world. ---- <div class="pull-right"> https://i.imgsafe.org/639b1c8cc2.jpg </div> ## But these weren't the first approaches to the subject... In 1973, Peter Tompkins and Christopher Bird claimed in *[The Secret Life of Plants](https://issuu.com/hunabkuproductions/docs/the_secret_life_of_plants_-_peter_tompkins-1973)* that plants were sentient beings that feel emotions and prefer classical to rock and roll music [3]. >*(...) plants are living, breathing, communicating creatures, endowed with personality and the attributes of the soul. It is only we, in our blindness, who have insisted on considering them automata. Most extraordinary, it now appears that plants may be ready, willing, and able to cooperate with humanity in the Herculean job of turning this planet back into a garden (...)* At the time, the research and subsequent book were heavily criticized by scientists for <br> promoting absurd pseudoscientific claims. > *In time the effects of this book will fade away — you can't fool too many people for too long a time. Meanwhile, some plant lovers will croon to their cattleyas and murmur to their mimosas (Mimosa pudica). This may comfort the vocalizers, but it won't do a thing for the plants . . . unless Tompkins and Bird have more hard evidence than they have yet shared with us* [[4](http://botany.org/PlantScienceBulletin/psb-1974-20-4.php)]. For many years plant sentience was considered a joke in the field of plant biology, until these last findings by Monica Gagliano's team. ---- #### This is *mimosa (Acacia dealbata)* I didn't murmur to it, but probably touched it leading to the close of its leaf branchlets! https://i.imgsafe.org/6280d559cd.jpg <sub>*Liliana Duarte| 2016*</sub> ----- References [1] - Gagliano M, Renton M, Depczynski M, Mancuso S (2014) Experience teaches plants to learn faster and forget slower in environments where it matters. *Oecologia* 175, 63–72 DOI: 10.1007/s00442-013-2873-7 [2] - Gagliano M, Vyazovskiy VV, Borbély A, Grimonprez M, Depczynski M (2016) Learning by Association in Plants. *Scientific Reports* 6:38427 | DOI: 10.1038/srep38427 [3] - Tompkins P, Bird C (1973) The Secret Life of Plants. New York: Harper & Row. [4] - Galston, Arthur (1974) The Unscientific Method. *Natural History* 83: 18-24. ---- https://i.imgsafe.org/129cd125a6.png > BADGES Courtesy of @elyaque
post_id | 1,907,098 |
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Interesting post, thanks for share ^_^
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liliana.duarte | 0 | 30,160,361,087 | 100% |
I found this matter pretty interesting! Glad you liked it too :)
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silviabeneforti | 0 | 2,433,714,273 | 100% |
Great post, the complexity of life never stops amazing me. I am studying in the field of synthetic biology and this post exited me about the possibilities engineering plants can pose. Plants can be engineered to have complex and nuanced responses based on their environment. They could be designed with internal DNA logic that allows them to sense the soil and make complex lifecycle decisions. Interesting stuff!
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Glad this post gave you some ideas. What do you mean by engineering plants? Genetically modifying plants?
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Some of the engineering would certainly be done with gene modification technology
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Yep I did a write up on this a bit ago :) Nice job
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Ohh noo! I didn't notice your post, if I did I wouldn't repeat the theme! This study and their results are very disruptive...I must share! It's funny how we explained the same paper focusing on different details of it...a result of our different perspectives!! :)
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justtryme90 | 0 | 5,926,687,210 | 1% |
No, it's fine to repeat :) it was an interesting piece of work! The more discussion on cool science the better IMO!
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liliana.duarte | 0 | 28,825,170,632 | 100% |
Very interesting. I spent some time living on a reserve in the Eastern Cape and learnt that certain types of trees also evolve to change their behaviours to protect themselves from animals. One for example omits a pheromone that is then passed on to the trees down wind which produce a bitter sap the animals don't like.....nature is amazing!
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liliana.duarte | 0 | 28,825,170,632 | 100% |
I already heard about that feature, I think it's a *Mimosa* sp., but not sure! Plants are always surprising me!!
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It will be interesting to see if folks can find out the mechanism of communication. I've seen articles about trees chemically communicating to others to prepare for pathogen attacks. And some folks have suggested that mycorrhizal mushrooms are involved in communication among trees, too. Plants are so fascinating!
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This paper and experience is absolutly amazing! What can we expect to be discovered now in terms of communication"?! Really fascinating organisms :) As far as I know, mushrooms can have a very important role in trees survival and growth. If mushrooms (fungus) can be one of the largest organisms in the world, why not be involved in communication among trees?
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It is so interesting, isn't it! Interconnectivity and chemical transfer is legitimate communication, I think. I think there's a lot more going on underground than we appreciate. There's a lot of science that needs to get done!
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