The fungus that produces oyster mushrooms preys on tiny animals by releasing a paralysing nerve fuel referred to as 3-octanone earlier than rising into their our bodies
Life
18 January 2023
Oyster mushrooms are scrumptious, however they’ve a little-known darkish aspect: the fungus that produces them paralyses and kills nematode worms utilizing a nerve fuel, earlier than sucking out their insides.
Oyster mushrooms are the reproductive buildings – or fruiting our bodies – of the fungus Pleurotus ostreatus. We now have recognized because the Eighties that this fungus preys on nematodes, that are microscopic roundworms, however the way it does this has been a thriller.
Yen-Ping Hsueh at Academia Sinica, a analysis institute in Taiwan, and her colleagues beforehand found that P. ostreatus accommodates tiny, lollipop-shaped buildings that break open when nematodes press their heads in opposition to them. They’ve now discovered that, as soon as ruptured, these buildings launch a fuel that’s extremely poisonous to nematodes’ nervous methods.
The researchers decided this by first inducing hundreds of random genetic mutations within the fungus, after which they seen that mutants missing these lollipop buildings had been not poisonous to the nematode Caenorhabditis elegans.
Subsequent, the researchers analysed the contents of the lollipop buildings in non-mutant fungi and located that they had been full of a risky chemical referred to as 3-octanone. After they uncovered 4 totally different nematode species to this chemical, it triggered an enormous inflow of calcium ions into nerve and muscle cells all through their our bodies, resulting in speedy paralysis and demise.
Hsueh calls this a “nerve fuel in a lollipop” killing technique.
The poisonous lollipop buildings are current on hyphae, the lengthy, branching buildings that develop inside rotting wooden and make up many of the fungus. The oyster mushrooms themselves are non-toxic, says Hsueh.
After the fungus kills its prey, its hyphae develop into the nematodes’ our bodies to suck out their contents. It could do that to soak up nitrogen, since this nutrient is poor within the rotting wooden on which the fungus principally grows, says Hsueh.
Nematodes are essentially the most ample animals in soil, which makes them a pure meals selection for fungi, she says. Different fungi use totally different techniques to catch nematode prey, together with sticky traps and nooses that tighten round their necks.
The discovering that P. ostreatus feeds on nematodes has led to some dialogue within the vegan group about whether or not oyster mushrooms are a really vegan meals.
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