Diplopterygium cantonense

Plants use carbon dioxide (CO2) during photosynthesis to produce food for themselves, and the availability of this gas can be a limiting factor for their growth. The current rise in levels of CO2 due to burning fossil fuels and other human activities might therefore be seen as a good thing for plant growth, and for <a href="https://www.earth.com/news/soil-quality-can-help-crops-survive-rising-temperatures/">crop</a> yields in particular. However, research from a team of scientists from six different countries indicates that the effects of global warming may not be as straightforward as this. For one, wheat plants don’t tolerate high temperatures very well.



The researchers estimated the comprehensive impact of climate change and extreme climate events on global wheat supply and the demand chain in a 2℃&nbsp;warmer world by using a novel climate-wheat-economic ensemble modelling approach, where they consider the impact of increasing temperatures on wheat price, livelihoods and agricultural markets.&nbsp;



The experts agree that CO2&nbsp;enrichment in the atmosphere could cancel out the effects of temperature stress on crops, and that a slightly higher wheat yield could result under a 2 ℃&nbsp;warming scenario. However, increases in global yield do not necessarily result in lower consumer prices. Indeed, the modelling results suggest that global wheat price spikes would become higher and more frequent, thus placing additional economic pressure on millions of people around the world.&nbsp;



“This counterintuitive result is initially driven by uneven impacts geographically. Wheat yields are projected to increase in high-latitude wheat exporting countries but show decreases in low-latitude wheat importing countries,”&nbsp;said lead author Zhang Tianyi, an agrometeorologist at the Institute of Atmospheric Physics, <a href="https://english.cas.cn/">Chinese Academy of Sciences</a>.



“This leads to higher demand for international trade and higher consumer prices in the importing countries, which would deepen the traditional trade patterns between wheat importing and exporting countries," explained study co-author Karin van der Wiel, a climate scientist at the Royal Netherlands Meteorological Institute,



It is possible that trade liberalization, the removal of restrictions on the exchange of goods between countries, could help to mitigate climate stress via improving market mobility. The current research team revealed that such policies could indeed reduce the costs of wheat products to consumers, but the impact on farmers would be mixed. For example, the promotion of free trade in wheat under 2 ℃&nbsp;warming could stabilize or even improve farmers’&nbsp;income in wheat exporting countries but would reduce income for farmers in wheat importing countries.



“These results would potentially cause a larger income gap, creating a new economic inequality between wheat importing and exporting countries,”&nbsp;said WEI Taoyuan, co-author and an economic scientist at the CICERO Center for International Climate Research. Zhang further explained that more dependence on imports could lower the wheat self-sufficiency ratio, thus causing a “vicious negative cycle”&nbsp;for wheat importing and less-developed countries in the long term.



“This study highlights that effective measures in trade liberalization policies are necessary to protect grain food industries in importing countries, support resilience, and enhance global food security under climate change,”&nbsp;said study co-author Frank Selten, a researcher at the Royal Netherlands Meteorological Institute.



The study is published in the journal <a href="https://www.oneearth.org/">One Earth</a>.



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Wheat prices will spike as climate changes

Plants use carbon dioxide (CO2) during photosynthesis to produce food...

There’s a lot of talk about how crops might suffer under climate change. New research from <a href="https://www.northwestern.edu/">Northwestern University</a> finds that staple crops such as soy, corn, and rice will all be hurt by a warming climate. The researchers also found one staple crop that is expected to be unfazed by climate change - breadfruit, a native of the Pacific Islands.&nbsp;



Because the starchy fruit is resistant to climate change and grows well in areas with food insecurity, the researchers predict it could become more common as a staple food in other places as well.&nbsp;&nbsp;



“Breadfruit is a neglected and underutilized species that happens to be relatively resilient in our climate change projections,” said study senior author Daniel Horton. “This is good news because several other staples that we rely on are not so resilient. In really hot conditions, some of those staple crops struggle and yields decrease. As we implement strategies to adapt to climate change, breadfruit should be considered in food security adaptation strategies.”



Despite its name, breadfruit is a starchy, seedless plant that has been boiled, fried, roasted or fermented for thousands of years. Like many other staples, breadfruit can also be made into flour.&nbsp;&nbsp;&nbsp;



Nyree Zerega is the director of the <a href="https://plantbiology.northwestern.edu/">Program in Plant Biology and Conservation</a>, a partnership between Northwestern and the Chicago Botanic Garden.&nbsp;



“Breadfruit trees can live for decades and provide a large amount of fruits each year. In some cultures, there is a tradition to plant a breadfruit tree when a child is born to ensure the child will have food for the rest of their life," said Zerega.



The researchers cultivated breadfruit under conditions reflecting two possible climate scenarios: one with an unlikely high amount of carbon and a second under a more likely scenario where carbon levels out. Under both conditions, breadfruit growth was relatively unaffected.&nbsp;



Next, the scientists identified places where breadfruit cultivation could be expanded - mainly in sub-Saharan Africa - and found that many of these places already suffer food insecurity. Breadfruit may be a possible solution as well as a future global solution.&nbsp;&nbsp;&nbsp;&nbsp;



“Climate change further emphasizes the need to diversify agriculture, so the world doesn’t rely on a small number of crop species to feed a large number of people,” Zerega said.&nbsp;



The study is published in the journal <a href="https://journals.plos.org/climate/">PLOS Climate</a>.&nbsp;



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By <a href="mailto:nire518@gmail.com">Erin Moody </a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Food of the future: breadfruit is resistant to climate change

There’s a lot of talk about how crops might suffer...

A large variety of animal species eat fruit – from toucans and fruit bats to maned wolves and humans. However, most fruit-bearing plants evolved relatively recent in our planet’s history, during the Cretaceous Period (145.5 to 65.5 million years ago). Now, by comparing the skull shapes and stomach contents of fossil birds, a research team led by the <a href="https://www.ox.ac.uk/">University of Oxford</a> has tracked down the first fossil evidence of fruit consumption. They found that the earliest-known fruit-eating animal was a long-tailed, raven-sized <a href="https://www.earth.com/news/climate-change-will-severely-impact-birds-by-2080/">bird</a> called Jeholornis, which lived 120 million years ago. According to the experts, this bird may have helped contribute to the spread of plants that dominate the world today.



“This is the oldest evidence of fruit-eating in any animal,” said study co-author Jingmai O’Connor, an associate curator of fossil reptiles at the <a href="https://www.fieldmuseum.org/">Field Museum</a> in Chicago. “Fruits are an incredible resource that everybody’s familiar with, and the plants that produce them are everywhere, but it wasn’t always that way. This discovery about how and when birds started exploiting this resource could help explain why these kinds of plants are so dominant in our landscape today.”



According to O’Connor, the fist Jeholornis fossil – described in 2002 – had plant remains scattered around it, as if they exploded out of its stomach cavity. At the beginning, researchers thought these were only seed and argued that the bird was feeding on seeds, rather than whole fruits. However, by examining dozens of Jeholornis specimens preserved at the <a href="http://www.tynhm.com/">Shandong Tianyu Museum of Nature</a> in China, the scientists discovered that, although the birds had more traits similar to dinosaurs than to modern birds, some features of their mouths and beaks – such as reduced teeth – could potentially hint at a “modern” diet including fruit.



Moreover, since birds which eat seeds have a “gastric mill” consisting of gizzard stones in their stomachs – which they ingest to help them crush seeds - the researchers examined also the stomach cavities of the fossils. The analysis revealed that, while some Jeholornis had gizzard stones, and others preserved seed in their stomachs, no specimen with both of these features was found. This suggests that the bird was eating different types of foods at different times of the year, including fruits when available. “Birds can drastically change the proportions of their digestive system to adapt to whatever their diet is for a particular season,” O’Connor explained. “This is the first evidence of that plasticity in dinosaurs.”&nbsp;



Thus, not only was Jeholornis the first known fruit-eating animal, but it may also have contributed to the evolution of the first fruit-producing plants. “Birds may have been recruited for seed dispersal during their earliest evolutionary stages,” said study lead author Han Hu, an expert in Paleobiology at Oxford. “As highly-mobile seed dispersers, early frugivorous birds might therefore indicate a potential role of bird-plant interactions during the Cretaceous Terrestrial Revolution.”



“Our research will hopefully inspire the research of paleontologists, ecologists, zoologists, and botanists who are interested in bird ecology, trophic interactions, and the Cretaceous Terrestrial Revolution,” she concluded.



The study is published in the journal <a href="http://dx.doi.org/10.7554/eLife.74751">eLife</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer&nbsp;&nbsp;

First fruit-eating animal in Earth’s history identified

A large variety of animal species eat fruit – from...

Scientists have long observed that <a href="https://www.earth.com/news/fungi-everywhere/">fungi</a> come in an assortment of shapes and sizes. However, these differences – referred to in the scientific community as the “disparity” of a group – had never been thoroughly analyzed. Now, a research team from the <a href="https://www.bristol.ac.uk/">University of Bristol</a> has found that the vast anatomical variety of fungi stems from evolutionary bursts in multicellular complexity.



“Prior to our analyses, we didn’t know how this variety was distributed across the different types of fungi,” said study lead author Thomas Smith, who conducted the research while at Bristol’s&nbsp;<a href="http://www.bristol.ac.uk/earthsciences/">School of Earth Sciences</a>. “Which groups are the most varied when considering all parts of the fungal body plan? Which are the least? How has this variety accumulated and diminished through time? What has shaped these patterns in disparity? These are the questions we sought to answer.”



Their investigation revealed that fungal disparity has evolved episodically through time, with the evolution of multicellularity in different types of fungi opening the door for greater morphological variety. The researchers found increases in diversity linked to both the emergence of the first multicellular fungi, and later on with the evolution of complex fruiting bodies such as mushrooms or saddles in dikaryotic species, which contain cells with two separate nuclei.



According to the scientists, these results align with those of previous studies analyzing animal disparity: both animals and fungi are characterized by clumpy distributions of anatomical variety that have evolved intermittently through time. “The world of fungi is defined by bright colors, strange shapes, and stranger anatomies. Our analyses demonstrate that this breath-taking anatomical variety has evolved in bursts, driven by evolutionary increases in multicellular complexity,” Smith said.



These findings bring scientists closer to characterizing, visualizing, and analyzing the disparity of all multicellular life. In future studies, by starting with in-depth analyses of plants and algae, they aim to combine the datasets characterizing the disparity of the fungus, plant, and animal kingdoms in order to further expand and fine-tune their taxonomy.



The study is published in the journal <a href="https://www.nature.com/natecolevol/">Nature Ecology &amp; Evolution</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer&nbsp;&nbsp;

Fungal variety shaped by evolutionary bursts in complexity

Scientists have long observed that fungi come in an assortment...

Scientists are finding an ecological and economic balance between <a href="https://www.earth.com/news/biodiversity-loss-weakens-ecosystem-functioning/">biodiversity</a> and vanilla cultivation in Madagascar. A team of researchers led by the <a href="https://www.uni-goettingen.de/en/1.html">University of Göttingen</a> has found a way to cultivate a cash crop while preserving biodiversity in Madagascar.&nbsp;



Although the vanilla industry in Madagascar brings positive and negative outcomes to the local Malagasy, it cannot be denied that the enterprise is a significant source of income for those fortunate enough to have the land to grow vanilla and resources to protect it.



"In northeastern Madagascar, the export of vanilla is an important source of income for tens of thousands of smallholder farmers and the widespread cultivation is a way to escape from poverty," explained study first author Dr. Annemarie Wurz.



The research team found vanilla cultivated on fallow land (agricultural land left unworked for some time) was better for biodiversity than vanilla cultivated in forests. For example, the experts found that vanilla grown in the forest led to a 47 percent decrease in endemic species. This number is depressing, especially considering that Madagascar is known for its unique species.&nbsp;



The study, published in the journal <a href="http://www.nature.com/articles/s41467-022-30866-8">Nature Communications</a>, was focused on biodiversity in Madagascar's northeastern area, a region known to be the world's largest vanilla producer. Wildlife examined for the study included trees, herbaceous plants, birds, amphibians, reptiles, butterflies, and ants.



The researchers discovered that growing vanilla on fallow land does not sacrifice economic gain since fallow land production and forest cultivation produce similar yields.



"The good news is that farmers do not have to clear land to achieve high yields. In fact, they can add value for biodiversity to fallow land by cultivating vanilla there," said Dr. Annemarie Wurz.



However, it should be noted that the density and length of the vanilla plants themselves could harm some aspects of biodiversity. The study found that denser and longer plants were better for crop yields but harmed tree and reptile species.



Nevertheless, the findings of this study could be crucial in conserving the biodiversity and economy of this delicate country.&nbsp;



"Promoting vanilla cultivation on fallow land is ecologically and economically significant," said study co-author Professor Ingo Grass. "This contributes to the current UN Decade for Ecosystem Restoration. In addition, this study illustrates possibilities for promoting and conserving biodiversity outside protected areas."



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By <a href="mailto:nire518@gmail.com">Erin Moody </a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Vanilla cultivation can boost biodiversity in Madagascar

Scientists are finding an ecological and economic balance between biodiversity...

Charles Darwin found remarkable <a href="https://www.earth.com/news/birds-expanded-into-quieter-cities-during-covid-lockdowns/">birds</a> on the Galápagos Islands when he visited on the HMS Beagle in 1835. They became known as “Darwin’s finches,” even though they were not finches at all. The remarkable thing about them, however, was that the 18 species all seemed to inhabit different islands in the archipelago. Over time they had developed different lifestyles, fed on different foods and had beaks that varied in form and function, despite the fact that they all arose from a single ancestral species.&nbsp;



The finches illustrate that populations may become adapted to environmental conditions found on specific islands and that, over time, the adaptations may make then so different that they can be considered separate species. They also support the island syndrome hypothesis that predicts the repeated and pronounced changes that some species undergo after colonizing islands. 



Animal species that become isolated on islands often show changes in body size (may become dwarfs or giants), locomotion (may become flightless), coloration and behavior. But what is the genetic basis for these changes, and does island syndrome apply to plants as well? 



A team of 30 scientists from four different continents has now tackled these questions using plants from the genus Scalesia. Known as giant daisies, they are found on the Galápagos Islands and were also encountered there by Darwin during his visit. There are 15 different species and, as you might guess, the remarkable thing about them was that, according to Darwin, “not one of these species grows on any two islands” – each species had adapted to the conditions on its own island. Scalesia is in the same family as daisies and sunflowers but the plants grow to the size of trees on the Galápagos Islands.



All 15 species evolved from a single species that, at some point in the distant past, arrived on the archipelago. The original species spread to neighboring islands and became adapted to the specific environmental conditions there. The descendants developed different characteristics and gradually turned into more specialized species, just like the finches. In fact, the giant daisies are commonly referred to as “Darwin’s finches of the plant world”. Today the different species are adapted to life in the dry lowlands, humid highlands and dry volcanic summits of Galápagos Islands.



The researchers chose to carry out DNA analysis of a single species of giant daisy, Scalesia atractyloides, in order to investigate the genetic basis of the plant’s adaptability. This species is a critically endangered dwarf tree found only on the island of Santiago in the Galápagos. Santiago is one of the four islands that Darwin visited during his trip to the archipelago.



“We sequenced and described the genome of the plant,” said José Cerca, a researcher in NTNU’s (The Norwegian University of Science and Technology) Department of Natural History at the NTNU University Museum. Cerca worked with Michael D. Martin, a professor and genetic expert in the Department of Natural History.



The results of the analysis, published in the journal <a href="https://www.nature.com/ncomms/">Nature Communications</a>, show many genetic variants in the plant’s genome that could have explained the original species’ ability to adapt and spread into distinct niches on the different islands.



“These variations are associated with vascular development, growth, adaptation to salinity and flowering time,” said Cerca. In other words, they reflect adaptability when faced with new environmental conditions on the islands.



In total, the researchers identified 920 genes in the genome that are under positive selection, meaning that they confer some form of advantage on the plant. These include genes that regulate leaf morphology, lead to rapid plant growth, promote tolerance of arid conditions and cause the closure of stomata.&nbsp;&nbsp;



In addition, the methods used by the researchers enabled them to infer what the genome of the original colonizing plant might have looked like. “We found that the common ancestor of all the species in the&nbsp;Scalesia&nbsp;genus was an allotetraploid,” says Cerca. An allotetraploid is a variant that has twice as many chromosomes in its cells, and therefore also genes, as a normal plant. This came about because two different plants had crossbred sometime in the history of the species, and had created a hybrid.



The crossbreeding, along with the extra sets of chromosomes and genes, also provides a large variety of genetic material for different traits that can be present in the offspring. This situation means that offspring have a better chance of being able to adapt to conditions in a new environment. Such crossbreeding is probably more common in plants than believed a few years ago, but for researchers it is still a big deal.



“We’re beginning to understand the genetic basis for how this one original plant species might have evolved into several species,” said Cerca.



The researchers also found that certain genes under selection, such as large body size, supported the island syndrome hypothesis, indicating that it is possible for some species on islands to show different phenotypes from their mainland counterparts.&nbsp;



“We’ve found irrefutable evidence of the island syndrome in the genes of Darwin's giant daisies,” said Cerca.



The group's work provides valuable insights into how species are able to adapt to different environments. This is perhaps especially important at a time when the environment in numerous places on the planet is changing faster than it has for a long time.



Image Credit: Sara Santacruz



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Study reveals how Darwin’s giant daisies spread into distinct niches

Charles Darwin found remarkable birds on the Galápagos Islands when...

While scientists have known that self-pollination can jeopardize <a href="https://www.earth.com/news/fungus-renders-corn-plants-defenseless-with-surgical-precision/">plant</a> species' long-term survival, they did not understand the mechanism behind the threat or how quickly it became detrimental. To investigate, a team of researchers led by Jeremiah Busch of <a href="https://wsu.edu/">Washington State University</a> conducted a genetic study.&nbsp;



"We found that in a very short amount of time, there were major consequences on the genomes of the plants when they had to adopt selfing," said Busch.



The team compared a group of self-pollinating monkeyflower plants to a group of bumble bee-pollinated monkeyflowers. They determined that the "selfing" plants lost between 13 and 24 percent of their genetic variation, and substantial loss occurred within nine generations.&nbsp;



We already know that genetic variation is a major factor in determining how species adapt to changing environments, so this loss could seriously hinder a plant's ability to survive.&nbsp;



Busch explained that in selfing populations, particular genotypes might be selected for if they are shown to be advantageous. However, some harmful mutations may "hitchhike" as well. This "genetic hitchhiking" is less likely in bee-pollinated populations due to the mixing of genetic material.&nbsp;&nbsp;&nbsp;



"Strong inbreeding fundamentally altered the consequences of adaptation," explained Busch. The findings are especially tragic considering the global bee decline.&nbsp;



"If pollinators are lost, it's not just going to be a problem for the pollinators: plant populations will lose genetic variation in tens of generations - not thousands, but tens."&nbsp;



Busch would be interested to see long-term studies determining if and when population collapse occurs due to a lack of pollinators and loss of genetic variation.&nbsp;



"A really important next step is to see how fast highly inbred groups will have their viability decline over time – to know how quickly those populations will go extinct," said Busch. "We need to really understand what the consequences are from pollinator loss. It will matter for wild populations of plants and crops. A lot of crops depend on bees."



This study can be found in the journal <a href="https://onlinelibrary.wiley.com/doi/10.1111/evo.14572">Evolution</a>.



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By <a href="mailto:nire518@gmail.com">Erin Moody </a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Bees do it better: self-pollinating plants lose genetic diversity

While scientists have known that self-pollination can jeopardize plant species'...

Diplopterygium cantonense

Taxonomic tree: