Trichomanes petersii is a vascular plant in the Hymenophyllaceae family. This species was first described by A. Gray in 1853.

Dwarf Bristle Fern (Didymoglossum petersii)

A recent study led by the <a href="https://www.ku.dk/english/">University of Copenhagen</a> has shed new light on how plant life became established on <a href="https://www.earth.com/news/earth-endured-rapid-global-warming-300-million-years-ago/">Earth</a> 470 million years ago. The experts found two genes that seem indispensable for allowing plants to defend themselves against fungal attacks – a crucial ability that paved the way for all terrestrial plant life.



When plants evolved from aquatic algae to survive on land nearly half a billion years ago, they needed to build defenses against the massive population of fungi colonizing the Earth.&nbsp;



“It is estimated that 100 million years prior, fungi crept across Earth’s surface in search of nourishment and most likely found it in dead algae washed up from the sea,” said study senior author Mads Eggert Nielsen. “So, if you, as a new plant, were going to establish yourself on land, and the first thing you encountered is a fungus that would eat you, you needed some sort of defense mechanism.”



According to the scientists, the essence of this defense mechanism can be narrowed down to two genes, PEN1 and SYP122, which help blocking the invasion of fungi.&nbsp;



“We found out that if we destroy these two genes in our model plant thale cress (Arabidopsis), we open the door for pathogenic fungi to penetrate. We found that they are essential to form this cell wall-like plug that defends against fungi. Interestingly, it appears to be a universal defense mechanism that is found in all terrestrial plants,” Dr. Nielsen explained. The same mechanism was also identified in liverwort, a direct descendent of one of the Earth’s first land plants.



While fungi posed a major obstacle for early plants, they were also a prerequisite. As soon as plants adapted to survive fungal attacks, the next problem they faced was finding nutrients. While nutrients such as phosphorous or nitrogen were easy to access in the water, the newly evolved land plants faced significant difficulties in extracting nutrients bound in the rocky land that was widespread on Earth half a billion years ago.&nbsp;



On the other hand, fungi could extract such nutrients, and entered into a symbiotic relationship with the first land plants, which, in their turn, provided fungi with the carbohydrates they could not find otherwise. Thus, the defense mechanisms plants developed simply stopped fungi from invading, but did not kill them.&nbsp;



“Since a fungus can only gain partial entry into a plant, we believe that a tipping point arises where both plant and fungus have something to gain. Therefore, it has been an advantage to maintain the relationship as is. The theory that plants tamed fungi to colonize land is not ours, but we are providing fodder that supports this idea,” explained Dr. Nielsen.



The results of this study – published in the journal <a href="https://elifesciences.org/articles/73487#s3">eLife</a> – could be used to make crops more resistant to fungal attacks, which is currently a major problem for farmers.&nbsp;&nbsp;



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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

Plants tamed fungi to colonize land half a billion years ago

A recent study led by the University of Copenhagen has...

Flavonoids are compounds produced by <a href="https://www.earth.com/news/scientists-grow-plants-in-lunar-soil-for-the-first-time/">plants</a> and thought to confer significant health benefits on humans. In plants, they act as essential pigments and are responsible for the colors found in buds, petals, fruits and autumn leaves. Flavonoids are found in many brightly colored fruits and vegetables, including blueberries, parsley, red grapes, cranberries, cherries and citrus fruits.



Research conducted by scientists from the <a href="https://www.uea.ac.uk/">University of East Anglia</a> set out to test whether supplementing people’s diets every day with cranberries (Vaccinium macrocarpon) could help improve memory and brain function in older individuals, and thereby reduce age-related neurodegeneration. Cranberries are rich in anthocyanins, a particular group of plant flavonoids that act as antioxidants.



“Dementia is expected to affect around 152 million people by 2050. There is no known cure, so it is crucial that we seek modifiable lifestyle interventions, such as diet, that could help lessen disease risk and burden," explained lead researcher Dr. David Vauzour.



“Past studies have shown that higher dietary flavonoid intake is associated with slower rates of cognitive decline and dementia,” he continued. “And foods rich in anthocyanins and proanthocyanidins, which give berries their red, blue, or purple colour, have been found to improve cognition. Cranberries are rich in these micronutrients and have been recognized for their antioxidant and anti-inflammatory properties.”



The researchers investigated the impact of eating 100g of cranberries each day for 12 weeks. The 60 participants, all cognitively healthy individuals between the ages of 50 and 80, were divided into two groups. One group took 100g of freeze-dried, powdered cranberry (equivalent to 1 cup of berries) as a supplement every day, while the other group received a placebo.&nbsp;



After 12 weeks, it was found that participants who had consumed the cranberry powder showed significantly improved memory of everyday events (visual episodic memory), neural functioning and delivery of blood to the brain (brain perfusion). These results have been published by the researchers in the journal <a href="https://www.frontiersin.org/journals/nutrition">Frontiers in Nutrition</a>.



“We found that the participants who consumed the cranberry powder showed significantly improved episodic memory performance in combination with improved circulation of essential nutrients such as oxygen and glucose to important parts of the brain that support cognition – specifically memory consolidation and retrieval," said Dr. Vauzour.



“The cranberry group also exhibited a significant decrease in LDL or ‘bad’ cholesterol levels, known to contribute to atherosclerosis – the thickening or hardening of the arteries caused by a build-up of plaque in the inner lining of an artery,” he added. “This supports the idea that cranberries can improve vascular health and may in part contribute to the improvement in brain perfusion and cognition.”



This study is one of the first to examine cranberries and their long-term impact on cognition and brain health in humans, and the researchers hope that their findings will be used to inform future strategies for the prevention of neurodegenerative diseases such as dementia.&nbsp;



“Demonstrating in humans that cranberry supplementation can improve cognitive performance and identifying some of the mechanisms responsible is an important step for this research field,” said Dr. Vauzour. "The findings of this study are very encouraging, especially considering that a relatively short 12-week cranberry intervention was able to produce significant improvements in memory and neural function."



The experts feel that their study establishes an important foundation for future research in the area of cranberries and neurological health.



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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

Cranberries help improve memory and brain function in older adults

Flavonoids are compounds produced by plants and thought to confer...

An international team of scientists has recently decoded the oat genome, and the results will help experts track down which <a href="https://www.earth.com/news/smart-pacifier-can-monitor-the-health-of-babies/">health</a> benefits are associated with which genes. Oats have complicated genetics, with six sets of chromosomes and over 80,000 genes. By comparison, humans have two sets of chromosomes and approximately 20,000 genes. 



This explains why it took Manuel Spannagl, a scientist at the Environmental Health Center at <a href="https://www.helmholtz-munich.de/en/helmholtz-zentrum-muenchen/index.html">Helmholtz Munich</a>, six years to sequence and analyze the oat genome.



Why decode the genome? The researchers were interested to know why fewer people are allergic to oats compared to foods like wheat and rye. They found that oats contain fewer proteins that correlate with gluten, which means that fewer people will be allergic to them. 



"This allowed us to confirm on a genomic level that oats in their pure form are suitable for a gluten-free diet," said study co-author Nadia Kamal.



The scientists also found the gene that produces beta-glucans, a type of dietary fiber. Compared to other cereals, oats have a much higher level of beta-glucans. These fibers are beneficial to those suffering from type 2 diabetes, and have also been shown to reduce cholesterol.



Oats are also good for the environment, and can grow in less than ideal soil and generally require less land than wheat. Compared to other cereals, cultivating oats typically requires less use of chemicals for insecticides, fungicides, and fertilizers.&nbsp;



Furthermore, now that we know more about their genetics, the researchers believe we can grow oats in an even more sustainable manner.&nbsp;



"We have created the potential for targeted breeding, since we are now able to tell which oat varieties are compatible with another," said Nick Sirijovski from Lund University and ScanOats. "At this point, we can combine traits for an even more favorable health profile, higher yields, better resistance to parasites and drought, and most importantly, in preparation for climate change."&nbsp;



The study is published in the journal <a href="https://www.nature.com/articles/s41586-022-04732-y">Nature</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

Genetic study on oats will help unlock their health benefits

An international team of scientists has recently decoded the oat...

View,Of,Lagoon,And,Wetland,Habitat,,Lagunas,De,Villafafila,Rese

Wetlands fringe the edges of land adjacent to the sea and, although they represent a small proportion of Earth’s terrestrial <a href="https://www.earth.com/news/shrinking-habitats-alien-species-threaten-native-trout/">habitats</a>, they provide important ecosystem services. They protect communities against the worst effects of hurricanes and typhoons and the plants sequester large amounts of carbon. But, as sea levels rise, the fate of wetlands hangs in the balance. Will they adapt or will they drown?



For decades, scientists have hoped that rising concentrations of carbon dioxide (CO2) would stimulate increased plant growth in general. In the case of coastal wetlands, this scenario would enable them to grow fast enough to outpace the rise in sea level. A new study, conducted by researchers from the <a href="https://serc.si.edu/">Smithsonian Environmental Research Center</a>&nbsp;(SERC), has now shed light on this question, and the findings do not look as hopeful.



The study took place at SERC’s&nbsp;<a href="https://serc.si.edu/gcrew">Global Change Research Wetland</a>, a research site run by biogeochemist Pat Megonigal on the western shore of Maryland. The research on wetland plant growth there represents the longest-running field experiment in the world on the impact of rising CO2&nbsp;levels on plants. Started in 1987, the design involves enclosing 15 small areas of wetland within open-top chambers, and then modifying the concentration of CO2 in the chambers and monitoring the growth responses of the plants as sea levels have slowly risen. A further 15 chambers serve as experimental controls that did not have any CO2 enrichment.



Over time, the scientists have raised the concentration of CO2 within the experimental chambers by an additional 340 parts per million, roughly doubling the atmospheric levels of 1987. In monitoring plant growth, they have focused particularly on the 10 chambers that contain “C3” plants that use a specific metabolic pathway to incorporate carbon from the atmosphere into sugars in their cells. These plants include roughly 85 percent of all plant species on Earth and they are known to respond vigorously to CO2&nbsp;enrichment.



The results, published today in the journal Science Advances, show that plant growth in the higher CO2 chambers flourished for about the first two decades of the study. Above ground, plants in the high-CO2&nbsp;chambers grew on average 25 percent more than plants in the untreated chambers. The effect was even more powerful underground, where higher levels of CO2&nbsp;triggered about 35 percent more root growth. Root growth is especially critical for wetland survival, as roots help wetlands trap soil and keep the foundations growing&nbsp;upward&nbsp;even as seas continue to rise.&nbsp;



“Even though elevated CO2&nbsp;contributes to sea-level rise, it also enhanced the marsh’s ability to accrete vertically during the early years of the experiment,” said Don Cahoon, a co-author and research ecologist, emeritus, with the&nbsp;<a href="https://www.usgs.gov/">U.S. Geological Survey</a>.



“In some ways, this is a race, a race between what CO2&nbsp;can do and what sea level can do," said study co-author Lewis Ziska, a plant physiologist at the&nbsp;<a href="https://www.publichealth.columbia.edu/">Columbia University Mailman School of Public Health</a>.



But after 2005, the growth effect declined and then stopped altogether. For the past 14 years of data in the study, there was no average difference in plant growth between the high-CO2&nbsp;and the normal chambers.&nbsp;



“The CO2&nbsp;effect has always been one of the silver linings of climate change,” said study co-author Adam Langley, an ecologist with&nbsp;<a href="https://www1.villanova.edu/university.html">Villanova University</a>. “Well, at least plants are going to grow more. But we see here that they didn’t. So the silver lining to me just got a little cloudier.”



The team investigated several possible explanations for the return to normal growth rate: precipitation, temperature, the saltiness of the water during growing season, and the presence of critical soil nutrients, like nitrogen. Only sea-level rise showed any link to plant growth. Once the sea level at the wetland rose by 15 centimeters from where it was in 1987, the benefits of higher CO2&nbsp;disappeared.



Sea water contains far less oxygen than air does and so, when wetlands flood, plants are deprived of oxygen. Plants need oxygen as well as CO2 for growth, and wetland plants are adapted to get most of their oxygen from the air rather than extracting it from water. As sea levels rise, the frequency of flooding increases and plants are unable to obtain the oxygen they need, so growth rates slow down.&nbsp;



“Plants are aerobic, oxygen-breathing organisms,” explained Megonigal. “And that includes their roots. And so they’re fundamentally faced with this problem of having their root system in an environment that doesn’t have any oxygen in it.”



Some wetlands may still be able to escape drowning. If wetlands cannot rise higher by building soil, migrating inland is another possibility. However, that can only happen if they have enough space to move into. For many communities, allowing room for wetlands to move inland would require a shift in how they use and value the land.



In the meantime, Earth’s climate accountants will need to rethink the planet’s carbon budget because it is possible that wetlands will not be around to absorb carbon from the atmosphere, as was originally thought. Now that scientists know extra CO2&nbsp;does not always stimulate wetland growth as much as they thought, the amount of carbon that can be sequestered in wetland plants in the coming decades is no longer certain.&nbsp;



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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

Wetlands are caught in a battle between CO2 and rising seas

Wetlands fringe the edges of land adjacent to the sea...

Alternative,Medicine.,Rosemary,,Mint,,Chamomile,,Thyme,In,A,Glass,Mortar.

Herbal supplements may not always be safe, according to a new study published by <a href="https://www.elsevier.com/">Elsevier</a>. The research highlights how serious side effects can result from the imprudent use of herbal supplements.



The report describes a case in which a patient was diagnosed with a dangerous cardiac arrhythmia after taking hemp oil containing <a href="https://www.earth.com/news/cbd-improves-eases-arthritis-symptoms-in-dogs/">CBD</a> and CBG along with berberine supplements.



“More and more people are taking herbal supplements for their potential benefits. Yet their ‘natural’ character can be misleading, since these preparations can have serious adverse side effects on their own or if combined with other supplements or medications,” said Dr. Elise Bakelants, an expert in the Department of Cardiology at the University Hospital of Geneva. “Their use should not be taken lightly, and dosing recommendations should always be respected.”



The study examined the case of a 56-year-old woman who experienced dizziness and fainting without warning. After physical exams came back as normal, doctors determined that the condition was caused by the herbal supplements she was taking to cope with stress.&nbsp;



Four months earlier, the patient had started taking six times the recommended dose of hemp oil, and had recently added berberine to the mix. She was then diagnosed with a life-threatening cardiac arrhythmia.



During her hospital stay, all supplements were stopped resulting in positive changes, which strongly validated a link between the supplements and the arrhythmia.



The popularity of herbal supplements has grown in recent years, especially those containing CBD (cannabidiol). This particular supplement is very accessible and available without any prescription.&nbsp;



CBD has been promoted for its anti-inflammatory, antipsychotic, and immunomodulatory properties. The products do not contain THC (tetrahydrocannabinol) - therefore, it is not subjected to scrutiny by drug regulatory agencies.&nbsp;



Berberine, found in many medicinal plants, is frequently used in traditional Chinese and ayurvedic medicine for various types of treatment.&nbsp;



The preparation of herbal supplements is largely unregulated. Exact composition can vary greatly from one distributor to another, and properties of these substances are not well known. There are limited data on their effectiveness and toxicity, making it&nbsp; difficult to predict potential side effects.



Dr. Bakelants cautioned patients and physicians to follow dosing recommendations and consider possible interactions with other medications, particularly in patients with underlying cardiac disease or those already taking QT-prolonging medication.



The study is published in the journal <a href="https://www.heartrhythmcasereports.com/">HeartRhythm Case Reports</a>.



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By <a href="mailto:katherinebucko@gmail.com">Katherine Bucko</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Herbal supplements are not always safe

Herbal supplements may not always be safe, according to a...

Forest,Trail,Scene.,Woodland,Path

<a href="https://www.earth.com/news/we-still-have-much-to-learn-about-tree-growth/">Tree</a> planting is often an environmental solution to offset emissions that contribute to climate change. However, if the trees burn in a forest fire, all of the carbon they store could be thrown back into the atmosphere. When trees die, they also stop scrubbing carbon dioxide from the air due to drought or insect damage.



According to new research from the <a href="https://www.utah.edu/">University of Utah</a>, the likelihood of these threats is increasing worldwide. Relying on forests to absorb carbon emissions could be riskier than previously thought.



“U.S. forests could look dramatically different by the end of the century,” said study lead author William Anderegg. “More severe and frequent fires and disturbances have huge impacts on our landscapes. We are likely to lose forests from some areas in the Western U.S. due to these disturbances, but much of this depends on how quickly we tackle climate change.”



The researchers modeled the risk of tree death from fire, climate stress, such as heat or drought, and insect damage for forests throughout the United States, projecting how those risks could increase overtime.&nbsp;



The models found that by 2099, United States forest fire risks may increase between four and 14 times, depending on different carbon emissions scenarios. The risks of climate stress-related tree death and insect mortality could double over the same time.



“Climate change is going to supercharge these three big disturbances in the U.S.,” said Anderegg. “We’ve seen devastating fire seasons with increasing severity in the past several years. Generally, we expect the western U.S. to be hit hardest by all three of these. And they’re somewhat interconnected too. Really hot and dry years, driven by climate change, tend to drive lots of fires, climate-driven tree mortality and insect outbreaks.”



In each model, actions to tackle climate change mattered significantly. Reducing the severity of climate change dramatically reduced the likelihood of fire, drought and insect-driven forest die-off. This signals an opportunity - taking action to address climate change now can help maintain healthy forests, and the offsetting of emissions trees provide.&nbsp;



The study is published in the journal <a href="https://onlinelibrary.wiley.com/journal/14610248">Ecology Letters</a>. The research was supported by the National Science Foundation, U.S. Department of Agriculture, David and Lucille Packard Foundation and Microsoft’s AI for Earth.



Click <a href="https://carbonplan.org/research/forest-risks">here</a> to see the findings in an interactive map.



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By <a href="mailto:katherinebucko@gmail.com">Katherine Bucko</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Climate change will "supercharge" forest disturbances

Tree planting is often an environmental solution to offset emissions...

A new study led by the <a href="https://www.udel.edu/">University of Delaware</a> has found that increasing our daily intake of apiaceous vegetables, such as <a href="https://www.earth.com/news/colorful-foods-can-prevent-cognitive-decline/">celery</a>, carrots, and parsley, could mitigate the effects of air pollutants in our bodies. According to the experts, these vegetables protect the body from the accumulation of acrolein, an irritant of the lungs and skin with a strong unpleasant smell, which is abundantly found in cigarette smoke and automobile exhaust.



Through a series of laboratory tests, study senior author Jae Kyeom Kim (an assistant professor of Behavioral Health and Nutrition at the University of Delaware) and his team analyzed how apiaceous vegetables mitigated acrolein-induced toxicities and reduced the oxidative stress triggered by these harmful substances.



“Kim’s research discovered that apiaceous vegetables supported detoxification through an increase in antioxidant enzyme activity,” said study co-author Jillian Trabulsi, an associate professor of Nutrition at the University of Delaware. “The results suggest that apiaceous vegetables may provide protection against acrolein-induced damages and inflammation because, in the liver, the vegetables enhance conversion of acrolein into a water-soluble acid for bodily excretion.”



In a next step, the scientists investigated what is a reasonable dosage amount for human consumption in order to fully benefit from these vegetables. 



“When we calculated this, we determined the actual daily calorie amount of apiaceous vegetables for humans is roughly 1 and 1/3 cups per day,” Professor Kim said. “It doesn’t require a high intake to see a difference, and this is an achievable amount in daily life.”



In future studies, Professor Kim and his team plan to integrate human intervention trials to better understand the health benefits of apiaceous vegetables. For the moment, they stress the importance of implementing behavioral changes in diet as a solution for combating the buildup of toxic substances derived from air pollution.



“Research has identified that it is the totality of nutrients in fruits and vegetables that support beneficial health outcomes, rather than a single nutrient. Focusing on a healthy whole food diet is more impactful than relying on individual supplements,” Professor Trabulsi concluded.



The study is published in the <a href="https://www.sciencedirect.com/science/article/abs/pii/S0955286322000109#!">Journal of Nutritional Biochemistry</a>.&nbsp;



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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

Eating vegetables can protect us against air pollutants

A new study led by the University of Delaware has...

Dwarf Bristle Fern

Description

Taxonomic tree: