Chantal Nguyen, University of Colorado Boulder

Most of us aren’t spending our days watching our houseplants grow. We see their signs of life only occasionally – a new leaf unfurled, a stem leaning toward the window.

But in the summer of 1863, Charles Darwin lay ill in bed, with nothing to do but watch his plants so closely that he could detect their small movements to and fro. The tendrils from his cucumber plants swept in circles until they encountered a stick, which they proceeded to twine around.

“I am getting very much amused by my tendrils,” he wrote.

This amusement blossomed into a decadeslong fascination with the little-noticed world of plant movements. He compiled his detailed observations and experiments in a 1880 book called “The Power of Movement in Plants.”

In one study, he traced the motion of a carnation leaf every few hours over the course of three days, revealing an irregular looping, jagged path. The swoops of cucumber tendrils and the zags of carnation leaves are examples of inherent, ubiquitous plant movements called circumnutations – from the Latin circum, meaning circle, and nutare, meaning to nod.

Circumnutations vary in size, regularity and timescale across plant species. But their exact function remains unclear.

I’m a physicist interested in understanding collective behavior in living systems. Like Darwin, I’m captivated by circumnutations, since they may underlie more complex phenomena in groups of plants.

Sunflower patterns

A 2017 study revealed a fascinating observation that got my colleagues and me wondering about the role circumnutations could play in plant growth patterns. In this study, researchers found that sunflowers grown in a dense row naturally formed a near-perfect zigzag pattern, with each plant leaning away from the row in alternating directions.

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This pattern allowed the plants to avoid shade from their neighbors and maximize their exposure to sunlight. These sunflowers flourished.

Researchers then planted some plants at the same density but constrained them so that they could grow only upright without leaning. These constrained plants produced less oil than the plants that could lean and get the maximum amount of sun.

While farmers can’t grow their sunflowers quite this close together due to the potential for disease spread, in the future they may be able to use these patterns to come up with new planting strategies.

Self-organization and randomness

This spontaneous pattern formation is a neat example of self-organization in nature. Self-organization refers to when initially disordered systems, such as a jungle of plants or a swarm of bees, achieve order without anything controlling them. Order emerges from the interactions between individual members of the system and their interactions with the environment.

Somewhat counterintuitively, noise – also called randomness – facilitates self-organization. Consider a colony of ants.

Ants secrete pheromones behind them as they crawl toward a food source. Other ants find this food source by following the pheromone trails, and they further reinforce the trail they took by secreting their own pheromones in turn. Over time, the ants converge on the best path to the food, and a single trail prevails.

But if a shorter path were to become possible, the ants would not necessarily find this path just by following the existing trail.

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If a few ants were to randomly deviate from the trail, though, they might stumble onto the shorter path and create a new trail. So this randomness injects a spontaneous change into the ants’ system that allows them to explore alternative scenarios.

Eventually, more ants would follow the new trail, and soon the shorter path would prevail. This randomness helps the ants adapt to changes in the environment, as a few ants spontaneously seek out more direct ways to their food source.

In biology, self-organized systems can be found at a range of scales, from the patterns of proteins inside cells to the socially complex colonies of honeybees that collectively build nests and forage for nectar.

Randomness in sunflower self-organization

So, could random, irregular circumnutations underpin the sunflowers’ self-organization?

My colleagues and I set out to explore this question by following the growth of young sunflowers we planted in the lab. Using cameras that imaged the plants every five minutes, we tracked the movement of the plants to see their circumnutatory paths.

We saw some loops and spirals, and lots of jagged movements. These ultimately appeared largely random, much like Darwin’s carnation. But when we placed the plants together in rows, they began to move away from one another, forming the same zigzag configurations that we’d seen in the previous study.

We analyzed the plants’ circumnutations and found that at any given time, the direction of the plant’s motion appeared completely independent of how it was moving about half an hour earlier. If you measured a plant’s motion once every 30 minutes, it would appear to be moving in a completely random way.

We also measured how much the plant’s leaves grew over the course of two weeks. By putting all of these results together, we sketched a picture of how a plant moved and grew on its own. This information allowed us to computationally model a sunflower and simulate how it behaves over the course of its growth.

A sunflower model

We modeled each plant simply as a circular crown on a stem, with the crown expanding according to the growth rate we measured experimentally. The simulated plant moved in a completely random way, taking a “step” every half hour.

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We created the model sunflowers with circumnutations of lower or higher intensity by tweaking the step sizes. At one end of the spectrum, sunflowers were much more likely to take tiny steps than big ones, leading to slow, minimal movement on average. At the other end were sunflowers that are equally as likely to take large steps as small steps, resulting in highly irregular movement. The real sunflowers we observed in our experiment were somewhere in the middle.

Plants require light to grow and have evolved the ability to detect shade and alter the direction of their growth in response.

We wanted our model sunflowers to do the same thing. So, we made it so that two plants that get too close to each other’s shade begin to lean away in opposite directions.

Finally, we wanted to see whether we could replicate the zigzag pattern we’d observed with the real sunflowers in our model.

First, we set the model sunflowers to make small circumnutations. Their shade avoidance responses pushed them away from each other, but that wasn’t enough to produce the zigzag – the model plants stayed stuck in a line. In physics, we would call this a “frustrated” system.

Then, we set the plants to make large circumnutations. The plants started moving in random patterns that often brought the plants closer together rather than farther apart. Again, no zigzag pattern like we’d seen in the field.

But when we set the model plants to make moderately large movements, similar to our experimental measurements, the plants could self-organize into a zigzag pattern that gave each sunflower optimal exposure to light.

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So, we showed that these random, irregular movements helped the plants explore their surroundings to find desirable arrangements that benefited their growth.

Plants are much more dynamic than people give them credit for. By taking the time to follow them, scientists and farmers can unlock their secrets and use plants’ movement to their advantage.

Chantal Nguyen, Postdoctoral Associate at the BioFrontiers Institute, University of Colorado Boulder

This article is republished from The Conversation under a Creative Commons license. Read the original article.

STM Daily News is a vibrant news blog dedicated to sharing the brighter side of human experiences. Emphasizing positive, uplifting stories, the site focuses on delivering inspiring, informative, and well-researched content. With a commitment to accurate, fair, and responsible journalism, STM Daily News aims to foster a community of readers passionate about positive change and engaged in meaningful conversations. Join the movement and explore stories that celebrate the positive impacts shaping our world.

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Noah Kaufman, Columbia University

On a recent visit to Rangely, a small town in northwest Colorado, my colleagues and I met with the administrators of a highly regarded community college to discuss the town’s economy. Leaving the scenic campus, we saw families driving into the mountains in off-road vehicles, a favorite activity for this outdoors-loving community. With a median household income above US$70,000 and a low cost of living, Rangely does not have the signs of a town in economic distress.

But an existential risk looms over Rangely. The town is here because of an oil boom during World War II. Today, the oil and gas industry contributes over half of the county’s economic output.

Rangely is not unique in the United States, which is the world’s largest producer of oil and natural gas. There are towns across the country that depend on the oil and gas industry for well-paying jobs and public revenues that fund their schools and other critical services.

A heavy dependence on any single industry is risky, and the oil industry is prone to booms and busts. But the economies of oil- and gas-dependent towns face a unique threat from global efforts to address the risks of climate change, which is fueled by the burning of oil and natural gas. Any serious strategy to halt global warming involves policies that will, over time, sharply reduce demand for all fossil fuels.

Early signs of this transformation can be seen in last year’s international agreement to “transition away from fossil fuels” and in the spread of electric vehicles that are starting to displace gasoline- and diesel-powered cars, trucks and buses.

As an economist who worked at the White House during the Obama administration and early Biden administration, I contributed to detailed strategies to reduce greenhouse gas emissions and to support communities in economic distress. But we did not have a plan to prepare oil and gas towns like Rangely for future economic challenges.

Why oil and gas towns are overlooked

Congress has prioritized support for small towns in recent legislation. However, oil- and gas-dependent towns were largely absent from these strategies for three primary reasons.

First is a perceived lack of urgency. The attention to a “just transition” as the nation moves away from fossil fuels has been disproportionately directed to coal-dependent communities. U.S. coal production has declined for 15 years, and a continued transition away from coal appears imminent and inevitable.

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In contrast, U.S. production of oil and natural gas continues to grow. To be sure, some oil and gas communities are already struggling. But the widespread economic risks of a shift away from oil and gas may feel more like a problem for future decades.

Second, politicians downplay risks to oil and gas communities.

Most Republicans are not planning for a future decline in oil and gas production at all, and that includes many local politicians in oil and gas-dependent communities. For their part, most Democratic politicians prefer to focus on how climate action can be an engine of future economic growth. President Joe Biden likes to say, “When I think about climate change, I think jobs.”

He is not wrong to highlight the economic opportunities of climate solutions. But clean energy jobs rarely offer one-for-one replacements for the high-paying jobs in the oil and gas industries and the public revenues those industries bring local communities.

Third, economists’ policy toolbox is poorly suited to the challenges facing oil and gas communities.

Proposals to support local economic development commonly suggest targeting persistently distressed local economies with measures such as wage subsidies that have the potential to rapidly put more people to work.

A different prescription is needed for oil and gas communities, which are not generally struggling today. Over the 15-year period prior to the pandemic, the U.S. counties with oil and gas production experienced average annual GDP growth of 2.4% per year, compared with 1.9% nationwide.

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Most oil and gas communities do not need economic stimulus policies that provide immediate relief. What they need are holistic economic development strategies that can cultivate new industries – building on their existing strengths – that will enable them to prosper into the future.

https://datawrapper.dwcdn.net/NL6to/1

Solutions to help oil and gas towns prepare

Harvard economist Ricardo Hausmann compares the challenge of developing new economic capabilities to the game of Scrabble, where each additional letter enables the creation of more words. He cites the Finish economy as an example: It evolved from harvesting lumber to making tools that cut wood to producing automated cutting machines. From there, it evolved to sophisticated automated machines, including those used by global corporations such as telecommunications giant Nokia.

Such economic evolutions must be tailored to the characteristics of individual places. But the initial step is to recognize the problem and invest in solutions.

The Southern Ute Indian Tribe is doing this in southwest Colorado. It devotes oil and gas revenues to a Permanent Fund, which promotes fiscal sustainability by ensuring the tribe’s assets are aligned with its long-term financial goals, and a Growth Fund that diversifies the tribe’s revenue sources by investing in a range of businesses.

At the national level, a recent National Academies panel proposed the creation of a federally chartered corporation to help communities facing acute economic threats, including a future decline in oil and gas. This corporation could provide funding for displaced workers, critical public infrastructure and programs that ensure access to economic opportunities.

Colorado’s state Office of Just Transition has started to serve this role. Currently, it focuses only on the transition away from coal, with the goals of helping communities develop new economic opportunities and helping workers transition to new jobs. But its mission could be expanded in the future. In fact, Rangely is already receiving some support due to coal closures nearby.

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No one-size-fits-all solution

Small, rural towns like Rangely illustrate how oil- and gas-reliant regions will need unique strategies tailored to the strengths and limitations of individual places. No off-the-shelf playbook exists.

Our group of researchers who visited Rangely are part of the Resilient Energy Economies initiative, which was created by universities, research institutes and philanthropic organizations to ensure that policymakers have the information they need to help fossil fuel-dependent communities successfully navigate the energy transition.

The best time to build a more resilient economy is before a crisis arrives. Anyone familiar with the Bible – or Broadway – knows the story of Joseph, whose dreams foresaw seven years of abundance for Egypt followed by seven years of famine. The pharaoh acted on Joseph’s vision, using the boom to prepare for the bust.

The United States is experiencing abundant oil and gas production today. Policymakers know risks are coming. But so far, the country is failing to prepare communities for harder days to come.

Noah Kaufman, Senior Research Scholar in Climate Economics, Columbia University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

STM Daily News is a vibrant news blog dedicated to sharing the brighter side of human experiences. Emphasizing positive, uplifting stories, the site focuses on delivering inspiring, informative, and well-researched content. With a commitment to accurate, fair, and responsible journalism, STM Daily News aims to foster a community of readers passionate about positive change and engaged in meaningful conversations. Join the movement and explore stories that celebrate the positive impacts shaping our world.

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https://stmdailynews.com/category/stories-this-moment

Space enthusiasts and media around the world are gearing up for an exciting Earth-to-space call scheduled with NASA astronauts Butch Wilmore and Suni Williams. This news conference is set to take place aboard the International Space Station (ISS) on Friday, September 13, at 2:15 p.m. EDT. The astronauts, who are currently part of Expedition 71/72, will share insights from their experiences in low Earth orbit.

Butch Wilmore and Suni Williams

NASA will stream the event live on NASA+, the NASA app, and the agency’s website, offering various platforms for viewers to tune in and experience the wonders of space exploration directly from its current pioneers. The coverage promises not only to highlight the astronauts’ daily activities and scientific endeavors but also provide a real-time connection with those orbiting our planet.

Butch Wilmore and Suni Williams were launched into space aboard Boeing’s Starliner spacecraft on June 5, marking its first crewed flight. They arrived at the ISS the following day. Following a decision to bring back the Starliner uncrewed, the duo’s stay has been extended, and they are now slated to return to Earth in February 2025 with the SpaceX Crew-9 mission aboard a SpaceX Dragon spacecraft.

For media looking to participate in the news conference, NASA’s Johnson Space Center in Houston must be contacted for accreditation by 5 p.m., Thursday, September 12. Media members will need to dial into the conference at least 10 minutes before it begins to ask their questions.

This event offers an invaluable opportunity for the public and the media to engage directly with the astronauts, gaining a deeper understanding of life in space and the ongoing research and operations that continue to push the boundaries of human spaceflight. As Wilmore and Williams continue their critical work on the ISS, this news conference is a much-anticipated chance to connect with the heroes of our final frontier.

To learn more about this event and keep up with the latest news on space station research and operations, visit NASA’s ISS portal.

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

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