Lifestyle
Forget flowers: These ancient plants attract pollinators by getting hot
Beetles (Rhopalotria furfuracea) visit a male cone of the cycad plant Zamia furfuracea, whose cones produce heat during pollination.
Michael Calonje
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Michael Calonje
Some of the earliest plants attracted pollinators by producing heat that made these plants glow with infrared light, according to a new set of experiments.
The work, published in the journal Science, suggests that long before brightly colored flowers evolved, these ancient plants would metabolically rev themselves up when they had pollen at the ready. Nocturnal insects such as beetles could then see that heat from afar and home in on the target.
These heat-producing plants, called cycads, exist today in tropical forests around the world, although they’re one of the most endangered plant groups.
“Some people call them dinosaur plants because they were much more dominant when the dinosaurs were around,” says Wendy Valencia-Montoya, a cycad expert at Harvard University.
Fossils from over 200 million years ago, compared to cycads that exist today, show that “the plants look exactly the same,” she says. “So they haven’t changed much in hundreds of millions of years.”
They’re related to pines, and male and female plants each produce fleshy, pine-cone-like structures that contain the pollen and the seeds. “That’s something very unique among this group of ancient plants,” says Valencia-Montoya, who says these are the oldest known plants that have pollen.
A couple of centuries ago, botanists noticed that these plants produced heat in their reproductive structures. Compared to the ambient air temperature, they can be hotter by 15 to 25 degrees Fahrenheit, or even more.
“We think of producing heat as something that mammals do, or birds do, but in fact, plants can do it too,” she says, although it’s not common in the plant world and takes a lot of energy.
In these plants, the heat was thought to be a byproduct of metabolic processes. Or, maybe the heat volatilized the scent of the plant, much like plugging an air freshener into an electrical outlet to generate heat that sends scent around a room. Research done in the last couple of decades has shown that male and female cones heat up at slightly different times, which could send pollinators moving from one cone to the other.
To try to understand more about what was going on, Valencia-Montoya and her colleagues painted some pollinating beetles with fluorescent markers to watch when the beetles went to the plant. And they found that the beetles were clearly going to the plant cones when they heated up.
This thermal image shows two male cycad cones releasing pollen. This plant’s cones heat up during pollen-release.
Wendy Valencia-Montoya
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Wendy Valencia-Montoya
To decouple the heat from other potential signals that these plants produce, like scent and humidity, her team used 3-D printing to make some simulated pollen cones. These fake plant structures were hollow inside, and got filled up with heated sand.
The fake cones glowed in the infrared much like real plants. “It was quite striking, when we saw it in the field,” says Valencia-Montoya, who says the fake plants were deployed outside at the Montgomery Botanical Center in Coral Gables, Florida.
Using these fake plants, the researchers figured out a couple of tricks to see if insects were attracted to the infrared glow, rather than the tactile sensation of heat itself. For example, in one experiment, they wrapped the cone with plastic wrap that is transparent to infrared light. Insects could see the infrared light but not get close enough to the cone to actually feel the heat.
What they found is that the infrared glow, by itself, was enough to attract hundreds of pollinating beetles.
And when they looked at those beetles, they found that they have specialized antennae that have evolved to detect slight differences in temperature — similar to the heat-sensing receptors used by snakes to detect prey.
What’s more, it turns out that the beetles’ antennae seem to be tuned to the exact temperature range deployed by their host plant, since different beetle species frequent different cycad species.
“Infrared radiation is perhaps the oldest discovered pollination signal,” says Nicholas Bellono of Harvard University, one of the authors of the new study.
Back when plants first evolved pollen, the insects that were around were nocturnal and had poor vision, says Valencia-Montoya. “So it makes a lot of sense that a signal like heat was guiding them.”
But as new groups emerged that were active in the day and had better vision, like butterflies and bees, “it makes more sense for plants to change their signaling strategy to also tap into the sensory systems of these more recent pollinators,” she says, adding that in evolution, there’s a constant dance back and forth between plants and their pollinators. Once color became a possible signal, flowering plants had an immense range of color combinations at their disposal, allowing them to rapidly diversify.
These researchers used “a powerhouse of techniques” to prove that the temperature of cycad’s heat-producing cones is intimately related to attracting pollinators, and that this association is ancient, says Roger Seymour, with the University of Adelaide in Australia, who wasn’t part of the research team: “This is an important contribution.”
Seymour thinks that heat could have more than one role, however, and the chance for a warm-up may be a bonus for beetles that require high body temperatures for activity. “Heat can be a direct energy reward to insect pollinators which may remain inside a thermogenic flower for much longer than insects visiting non-thermogenic species,” he says.
Irene Terry at Tthe University of Utah, an ecologist who specializes in cycads and their insect interactions but wasn’t part of this research team, says it’s only been relatively recently that people realized these ancient plants even had pollinators, rather than just spreading their pollen with the wind.
Particular odorants seem to be important pollinator attractants, she says, noting that these plants can smell like everything from bubblegum to bell peppers. Still, this study shows “in the most beautiful way” that infrared is also key.
“I was not surprised at all that infrared was involved,” says Terry, given that other insects like mosquitoes use infrared to find their way to a target. “There’s a range of things that insects can see that we don’t.”
Imagine, says Bellono, being a prehistoric beetle trying to navigate the darkened environment in the early evening, and seeing various plants start to glow red.
“The infrared is an entirely different world that we don’t experience,” he says. “I think that’s a cool thing to think about, going back in time, that this signal was around when the dinosaurs were there, long before us. And the beetles still use it to this day and are still experiencing that world.”
Mara is a single mother of two in Minnesota. She and her family have depended on SNAP benefits to make ends meet.
Caroline Yang for NPR
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Caroline Yang for NPR
Although Mara is unemployed, she is busier than ever.
When she is not taking care of her two children, Mara is at her desk applying for jobs. She is surveying her belongings to see what she can pawn off to buy toiletries. Or she is sifting through bills, calculating which ones can wait and which need to be paid right away.
Soon, Mara, a single mom in Minnesota, may have another task on her busy schedule: figuring out how to afford food for her and her family.
That’s because of new work requirements for people receiving aid from the Supplemental Nutrition Assistance Program, also known as SNAP or food stamps.
“It would be so beyond hard” to lose SNAP benefits, Mara said. “Without SNAP, there’s no funds for food.” Mara asked for her last name to be withheld given the stigma tied to receiving government assistance. She is also worried that speaking publicly will affect her chances of getting a job.
Previously, SNAP recipients with children under 18 were exempt from work requirements mandating that recipients work, volunteer or participate in job training at least 80 hours a month. But now, under President Trump’s One Big Beautiful Bill Act, that exemption only applies to those with children under 14 — which is how old Mara’s youngest child turned in December.
“It would be so beyond hard” to lose SNAP benefits, Mara said.
Caroline Yang for NPR
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Caroline Yang for NPR
The Trump administration has argued that the mission of the nation’s largest anti-hunger program has failed.
“SNAP was intended to be temporary help for those who encounter tough times. Now, it’s become so bloated that it is leaving fewer resources for those who truly need help,” the White House said in a statement in June.
But policy experts say the SNAP changes do not fully take into account the unique challenges faced by single parents like Mara or the sluggish job market in many parts of the country. They argue that losing food assistance will only create more barriers for recipients struggling to find work.
The timeline for implementing the new SNAP policy varies based on state and county. In Mara’s home state of Minnesota, recipients who don’t qualify for an exemption or meet work requirements will be at risk of losing assistance as early as April 1. Others may have more months depending on when they next need to certify they are eligible for benefits.
Over 100 job applications
Mara imagined she would have a job by now.
It was August when she was let go from her part-time administrative assistant role due to her workplace restructuring. Since then, Mara estimates that she has applied for over 100 positions. She has also attended job fairs and taken free workshops on resume writing.
She has been working since high school, she said, but “ I’ve never been out of work for more than one month, so it’s very difficult.”
Mara spends time working at the computer at CareerForce, a resource for job seekers in Minnesota, on March 4.
Caroline Yang for NPR
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Caroline Yang for NPR
Although she misses her old job, Mara said it didn’t pay enough to support her and her kids, so she relied on SNAP benefits.
Many recipients are part of the low-wage labor market, where job security is often unpredictable and turnover tends to be high, according to Lauren Bauer, a researcher at the Brookings Institution who has studied SNAP extensively.
“SNAP is supposed to be there to help people smooth that and not let the bottom fall out when they experience job loss,” she said. “And this policy doesn’t account for that at all.”
Mara’s lowest point came in November when the government shutdown led to disruptions in SNAP benefits. Not only was she searching for a new job, but she was constantly figuring out where to get her family’s next meal.
“I might be looking for food stuff during the day when I should have been looking for a job,” she said. “Then, I’m trying to make up that time in the evening after my kids go to bed.”
During the pause, Mara turned to food banks, which revealed other challenges. First, food pantries do not always provide enough for an adult and two growing teenagers, she said. Second, they often lack gluten-free foods, which is essential for her daughter who has celiac disease, an autoimmune disorder that causes digestive problems if gluten is consumed. Gluten-free products tend to be more expensive.
If Mara loses access to SNAP again because of the new work requirements, she fears another stretch of long days spent looking for the right food and enough to feed her family.
“I would be so reliant on looking for food shelves or food banks,” she said. “There would not be time to even live.”
“We’re going to see increases in poverty. We’re going to see increases in food insecurity”
The Congressional Budget Office estimates that roughly 2.4 million people will lose food benefits in a typical month over the next decade as a result of the new SNAP requirements — including 300,000 parents like Mara with children 14 or older.
Gina Plata-Nino, the SNAP director at the nonprofit Food Research & Action Center, says many of the affected recipients will be single mothers who make up a majority of single parent households in the U.S. She added that the changes target a group that often lacks or struggles to afford a support system to help care for their children.
“How can they have a full-time job when they need to pick up their children [for] various activities?” she said. “And they are working — just not enough hours because they need to be there present for their children.”
Mara shops for groceries at a local discount grocery store.
Caroline Yang for NPR
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Caroline Yang for NPR
The new law also imposes work requirements on veterans, homeless people, young adults aging out of foster care, and able-bodied adults without dependents from ages 55 to 64.
It also toughened the criteria for waiving work requirements for recipients in areas with high unemployment. Previously, there were multiple ways to determine a weak labor market and secure a waiver. Now, it only applies to places with an unemployment rate above 10%. (Alaska and Hawaii have a different measure.)
For those who fail to meet the work requirement, SNAP provides assistance for up to three months within a three-year span. But Bauer from the Brookings Institution argues that it is not enough and the impact of SNAP changes will be widespread.
“We’re going to see increases in poverty. We’re going to see increases in food insecurity. We’re going to see increasing strain on the charitable food sector,” she said.
Mara holds her favorite anchor ring, which carries the inscription, “God for me provide thee.”
Caroline Yang for NPR
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Caroline Yang for NPR
As anxiety hangs over her head, Mara tries to put on a brave face for her children. She does not want them to worry, explaining that her recent struggles have reminded her how tough life can get as an adult.
“I remind them it’s not their responsibility and they’re not accountable for me or for what’s happening,” she said. “I say, just know you get to be a kid.”
Dylan Dreyer
Savannah Will Likely Come Back … Just Not Sure When
Published
TMZ.com
Dylan Dreyer is giving a small update on her embattled “Today” co-host, Savannah Guthrie, as the search continues for Savannah’s mom, Nancy — telling TMZ she does believe she’ll likely return to the show at some point.
We caught Dylan leaving NBC Tuesday afternoon, and she said while she thinks Savannah will come back, the timing is totally unclear — adding everyone at the show is simply giving her the space she needs because they care about her so much.
TMZ.com
Dylan also reflected on Savannah’s emotional visit to the “TODAY” studio last Thursday, saying the hug they shared was something they both really needed in that moment.
Catch the full clip — Dylan says the visit was incredibly emotional, adding Savannah clearly wants to get back to some sense of normal life … she just doesn’t quite know how yet.
Still, Savannah managed a few smiles during the brief stop by the studio, doing her best to keep moving forward during an incredibly tough time.
TMZ.com
As we reported, Nancy was taken from her Tucson home in the middle of the night on February 1. She was last seen entering the house just before 10 PM on January 31 after dinner with her daughter Annie and Annie’s husband, Tommaso Cioni.
Kevin Kline plays actor Richard Bean, and Laura Linney is his sister-in-law Kristen, in American Classic.
David Giesbrecht/MGM+
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David Giesbrecht/MGM+
American Classic is a hidden gem, in more ways than one. It’s hidden because it’s on MGM+, a stand-alone streaming service that, let’s face it, most people don’t have. But MGM+ is available without subscription for a seven-day free trial, on its website or through Prime Video and Roku. And you should find and watch American Classic, because it’s an absolutely charming and wonderful TV jewel.
Charming, in the way it brings small towns and ordinary people to life, as in Northern Exposure. Wonderful, in the way it reflects the joys of local theater productions, as in Slings & Arrows, and the American Playhouse production of Kurt Vonnegut’s Who Am I This Time?
The creators of American Classic are Michael Hoffman and Bob Martin. Martin co-wrote and co-created Slings & Arrows, so that comparison comes easily. And back in the early 1980s, Who Am I This Time? was about people who transformed onstage from ordinary citizens into extraordinary performers. It’s a conceit that works only if you have brilliant actors to bring it to life convincingly. That American Playhouse production had two young actors — Christopher Walken and Susan Sarandon — so yes, it worked. And American Classic, with its mix of veteran and young actors, does, too.
American Classic begins with Kevin Kline, as Shakespearean actor Richard Bean, confronting a New York Times drama critic about his negative opening-night review of Richard’s King Lear. The next day, Richard’s agent, played by Tony Shalhoub, calls Richard in to tell him his tantrum was captured by cellphone and went viral, and that he has to lay low for a while.
Richard returns home to the small town of Millersburg, Pa., where his parents ran a local theater. Almost everyone we meet is a treasure. His father, who has bouts of dementia, is played by Len Cariou, who starred on Broadway in Sweeney Todd. Richard’s brother, Jon, is played by Jon Tenney of The Closer, and his wife, Kristen, is played by the great Laura Linney, from Ozark and John Adams.
Things get even more complicated because the old theater is now a dinner theater, filling its schedule with performances by touring regional companies. Its survival is at risk, so Richard decides to save the theater by mounting a new production of Thornton Wilder’s Our Town, casting the local small-town residents to play … local small-town residents.
Miranda, Richard’s college-bound niece, continues the family theatrical tradition — and Nell Verlaque, the young actress who plays her, has a breakout role here. She’s terrific — funny, touching, totally natural. And when she takes the stage as Emily in Our Town, she’s heart-wrenching. Playwright Wilder is served magnificently here — and so is William Shakespeare, whose works and words Kline tackles in more than one inspirational scene in this series.
I don’t want to reveal too much about the conflicts, and surprises, in American Classic, but please trust me: The more episodes you watch, the better it gets. The characters evolve, and go in unexpected directions and pairings. Kline’s Richard starts out thinking about only himself, but ends up just the opposite. And if, as Shakespeare wrote, the play’s the thing, the thing here is, the plays we see, and the soliloquies we hear, are spellbinding.
And there’s plenty of fun to be had outside the classics in American Classic. The table reads are the most delightful since the ones in Only Murders in the Building. The dinner-table arguments are the most explosive since the ones in The Bear. Some scenes are take-your-breath-away dramatic. Others are infectiously silly, as when Richard works with a cast member forced upon him by the angel of this new Our Town production.
Take the effort to find, and watch, American Classic. It’ll remind you why, when it’s this good, it’s easy to love the theater. And television.
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