{"id":22244,"date":"2023-01-01T05:00:33","date_gmt":"2023-01-01T04:00:33","guid":{"rendered":"https:\/\/www.sciencefocus.com\/?p=130809"},"modified":"2023-01-01T06:35:29","modified_gmt":"2023-01-01T05:35:29","slug":"fungi-absolutely-everything-you-need-to-know-about-these-surprising-lifeforms","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/rss_feed\/fungi-absolutely-everything-you-need-to-know-about-these-surprising-lifeforms\/","title":{"rendered":"Fungi: Absolutely everything you need to know about these surprising lifeforms"},"content":{"rendered":"

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By Helen Pilcher\n \t\t<\/p>

Published: Sunday, 01 January 2023 at 12:00 am<\/p>

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What are fungi?<\/strong><\/h2>\n

Fungi are decomposing, fermenting, edible, toxic, carbon-sequestering, disease-causing, disease-curing, pollutant-busting, mind-bending, rain-generating, zombie-making marvels. They underpin almost all life on\u00a0Earth,\u00a0but are mostly situated underground and\u00a0often\u00a0overlooked.<\/p>\n

When we think of fungi, mushrooms\u00a0spring to mind, but these are just the small \u2018above ground\u2019 portion of the organism. Mushrooms are the fruiting body of the fungus, like the apples on a tree. Most of the fungus is hidden underground in the form of a branching network of tubular filaments called mycelium. If you\u00a0took a teaspoon of healthy soil and lined up all the mycelium within it, it\u00a0would stretch up to 10km.<\/p>\n

Spread over 9km2, Oregon\u2019s \u2018Humongous Fungus\u2019 is thought to be the world\u2019s largest living organism. <\/blockquote> <\/div> <\/div> <\/div>\n<\/div>

Plant or animal?<\/strong><\/h2>\n

Neither. Fungi belong to their own kingdom of life. It contains an estimated 2.2 to 3.8 million species, of which only 148,000 species or so have been described. Fungi used to be seen as simple plants, but scientists now realise that they are more closely related to animals than plants. Thousands of new fungal species are discovered every year.<\/p>\n

How big are fungi?<\/h2>\n

Fungi come in a wide range of sizes. They can be single-celled and microscopic, like the yeast used in the beer-brewing industry, but they can also be multicellular and massive.<\/p>\n

Spread over an astonishing 9km2, the \u2018Humongous Fungus<\/a>\u2019 in Oregon\u2019s Malheur National Forest is thought to be the world\u2019s largest living organism. It weighs hundreds of tonnes and is estimated to be between 2,000 and 8,000 years old.<\/p>\n

How do fungi interact with plants?<\/strong><\/h2>\n

Around 90\u00a0per cent\u00a0of land-living plants have fungi living in their roots. A single plant can house dozens of different species. Mycorrhizal fungi, as they are known, send out fine fungal tubes that\u00a0penetrate the root tips of plants. The result is a mutually beneficial relationship, where the fungi\u00a0siphon sugars from the plant, and the plant receives water and nutrients in return.<\/p>\n

The plant also becomes tapped into the\u00a0much wider network of sprawling underground filaments, known as the Wood Wide Web<\/a>. Plants near and far are connected by it. It enables them to share resources, such as nutrients and carbon, and also information. When broad bean plants are attacked by aphids, for example, they use the subterranean messaging system to send warning signals to neighbouring plants, which respond by releasing aphid-repelling chemicals.<\/p>\n

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The wood wide web connects plants and fungi, allowing them to share resources, such as nutrients and carbon \u00a9 Sam Falconer<\/span><\/figcaption><\/div>\n

How (and what) do fungi eat? <\/strong><\/h2>\n

Fungi digest their food externally by secreting enzymes and then absorbing dissolved organic matter. Some fungi actively capture their prey.\u00a0Arthrobotrys oligospora\u00a0<\/em>lures nematode worms to it by releasing molecules that smell like the worm\u2019s natural food. On arrival, the hapless worm is then dissolved and digested.<\/p>\n

Many\u00a0fungi feed on dead or decaying material, such as\u00a0rotting logs or animal corpses. As such, they play a vital role in\u00a0recycling the world\u2019s organic matter. Other fungi are parasites<\/a>\u00a0that\u00a0feed on living organisms.\u00a0Dutch elm disease (which affects trees) and ringworm (which affects people) are caused by parasitic fungi.\u00a0All this is just for starters, as fungi can also digest rock, crude oil, plastics, cardboard and\u00a0even\u00a0explosive TNT.<\/p>\n

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Many\u00a0fungi feed on dead or decaying material, such as\u00a0rotting logs or animal corpses, and play a vital role in recycling organic matter \u00a9 Sam Falconer<\/span><\/figcaption><\/div>\n

Where do fungi live?<\/strong><\/h2>\n

Just about everywhere, in just about everything\u2026 living organisms, soil, air, water, rock, even nuclear waste sites. Fungi found growing at the ruined Chernobyl nuclear reactor<\/a> in Ukraine can absorb high levels of radiation, which they use as a source of energy. Now scientists are exploring whether fungi like this could help to protect people from radiation during deep space missions.<\/p>\n

How do fungi reproduce?<\/strong><\/h2>\n

They can reproduce sexually, asexually (without sex) and parasexually (where tiny filaments called hyphae fuse together). Often, reproduction involves the production of spores, which are a bit like the seeds of a plant. Spores are dispersed into the environment, enabling the fungus to colonise new areas.<\/p>\n

Some fungi eject spores explosively, accelerating up to 10,000 times faster than a post-launch Space Shuttle. Others create their own microclimates. As water evaporates from the gills of a mushroom, it can create an updraught\u00a0that\u00a0helps to\u00a0lift spores into the air.<\/p>\n

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In order to reproduce, some fungi explosively eject spores, accelerating up to 10,000 times faster than a post-launch Space Shuttle \u00a9 Sam Falconer<\/span><\/figcaption><\/div>\n

When did fungi first evolve?<\/strong><\/h2>\n

Around a billion years ago. The first fungi would have been small, aquatic,\u00a0single-celled organisms.\u00a0Roughly\u00a0500 million years ago, they helped plants move out of the water onto the land, by acting as their root systems.\u00a0Then\u00a0100\u00a0million years later, fungi were the tallest living things on\u00a0Earth.\u00a0Prototaxites<\/em>\u00a0was a massive, trunk-like fungus\u00a0that\u00a0grew up to\u00a0nine metres in height.<\/p>\n

Can you farm fungi?<\/strong><\/h2>\n

Yes, but for further advice, please ask the leafcutter ant<\/a>. These industrious insects feed the leaf fragments they collect to the fungi that they cultivate inside their enormous underground nests. The fungi are fed to the ant\u2019s larvae, and the adults keep the resource in tip-top condition by obsessively monitoring it, feeding it and keeping it pest free.<\/p>\n

Can fungi make zombies?<\/strong><\/h2>\n

Yes,\u00a0the\u00a0unlucky carpenter ant\u00a0can become\u00a0the victim of\u00a0Ophiocordyceps unilateralis<\/em><\/a>, the zombie-ant fungus.\u00a0At the start of an\u00a0extraordinary\u00a0sequence of events, the brain of an infected ant becomes hijacked,\u00a0prompting it to climb a nearby plant and bite into a leaf that is exactly 25cm above the ground, at\u00a0just the right temperature and humidity for the fungus to grow.<\/p>\n

The fungus eats the ant\u2019s internal organs and extends a long stalk through its head, which then bursts and rains spores down onto any ants below. The cycle of zombification\u00a0continues.<\/p>\n

What is the most helpful fungus?<\/strong><\/h2>\n

Fungi can be killers, but they can also save lives. The antibiotic penicillin is produced by the fungus\u00a0Penicillium<\/em>. It was discovered, by accident, almost 100 years ago, when Alexander Fleming spotted a bacteria-slaying mould growing on a forgotten Petri dish.<\/p>\n

Since then, penicillin has saved hundreds of millions of lives, added 20 years of life expectancy across the world, and paved the way for countless procedures, such as caesareans and organ transplants, to be performed with a reduced risk of infection.<\/p>\n

Penicillium<\/em>\u00a0is also\u00a0helpful\u00a0in food production.\u00a0Penicillium camemberti <\/em>and Penicillium roqueforti<\/em>\u00a0are used in Camembert, Brie, Roquefort and many other cheeses, while\u00a0Penicillium nalgiovense<\/em>\u00a0is used to boost the flavour of certain sausages and hams.<\/p>\n

Fungi can be killers, but they can also save lives. The antibiotic penicillin is produced by the fungus Penicillium. <\/blockquote> <\/div> <\/div> <\/div>\n<\/div>
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The discovery of penicillin has saved hundreds of millions of lives \u00a9 Sam Falconer<\/span><\/figcaption><\/div>\n

What is the deadliest fungus?<\/strong><\/h2>\n

Responsible for 90\u00a0per cent\u00a0of the world\u2019s mushroom-related fatalities, the deathcap mushroom<\/a> is officially the world\u2019s most poisonous mushroom. It looks like some edible mushrooms, such as the\u00a0puffball and\u00a0paddy straw, but eating it can lead to organ failure, seizures, coma and death.<\/p>\n

Elsewhere, the chytrid fungus<\/a> is decimating the world\u2019s amphibians. It enters the animals\u2019 bodies through their skin, upsets their fluid balance, and kills by causing heart failure. Spread around the world by the commercial trade in amphibians, it\u2019s now found on every continent except Antarctica (where there are no amphibians).<\/p>\n

Over the past 50 years, it has caused the decline of more than 400 amphibian species, and the extinction of 90.<\/p>\n

The chytrid fungus has caused the decline of over 400 amphibian species, and extinction of 90. <\/blockquote> <\/div> <\/div> <\/div>\n<\/div>

How could fungi be used in the future?<\/strong><\/h2>\n

There are so many opportunities for fungi. Fungi can be used to break down pollutants, such as pesticides, plastics and crude oil. Mycelium mats can filter contaminants, such as heavy metals, from dirty water.<\/p>\n

Fungi can be used to break down waste products from food production and\u00a0the building sector, and build sustainable, carbon-neutral materials, such as fabrics and construction materials. The\u00a0Trichoderma<\/em> fungus can turn crop waste into bioethanol, while elsewhere in agriculture, fungi are being used to boost crop growth and help control disease.<\/p>\n

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There are lots of surprising ways that fungi have been utilised in modern life \u00a9 Sam Falconer<\/span><\/figcaption><\/div>\n

6 ways that fungi affect our lives<\/strong><\/h2>\n
  1. Itaconic acid, derived from Aspergillus<\/em> fungi, is used in a wide range of industries. Products include LEGO, plastic car parts, printing inks, UV coatings and synthetic rubber.<\/li>\n
  2. More than 200 species of fungi are thought to be hallucinogenic. Psilocybin, found in magic mushrooms, is being explored as a treatment for depression and anxiety<\/a>.<\/li>\n
  3. Adidas has developed a pair of trainers made from mycelium, and Stella McCartney has premiered a \u2018panelled bustier and utilitarian trouser set\u2019 fashioned from the same fungal product.<\/li>\n
  4. Fungi can influence the weather. When their spores occur in clouds, they can seed raindrops and spur the formation of ice crystals, which can fall as snow, sleet or hail.<\/li>\n
  5. The global market for edible mushrooms is worth over $42bn per year. But out of the estimated 10,000 mushroom species found worldwide, only about 350 species are known to be edible.<\/li>\n
  6. Most fungi have cell walls made of chitin, which is a substance found in the exoskeletons of insects and the shells of crabs and lobsters.<\/li>\n<\/ol>

    Read more about fungi:<\/strong><\/p>\n