- "Soil’s Microbial Market Shows the Ruthless Side of Forests"
- "Bacterial Organelles Revise Ideas About ‘Which Came First?’"
Por exemplo, da fonte 1:
"plants and their fungal conspirators are not just cooperating with each other but also engaging in a raucous and often cutthroat marketplace ruled by supply and demand, where everyone is out to get the best deal for themselves and their kind.
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Microbes are not simple, passive accessories to plants, but dynamic, powerful actors in their own right. Fungi can hoard nutrients, they can reward plants that are generous with their carbon reserves and punish ones that are stingy, and they can deftly move and trade resources to get the best “deal” for themselves in exchange.
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fungi might not be just nutrient traders but also sophisticated information processors.
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“I had this realization … that I’m less interested in cooperation and I’m actually much more interested in the tension,” Kiers said. “I think there’s an underappreciation of how tension drives innovation. Cooperation to me suggests a stasis.”[Moi ici: Não consigo deixar de pensar naquele número que sempre que o procuro aqui no blogue nunca o encontro. Dos anos 60 do século passado até aos nossos dias, o número de patentes registadas por independentes ou PMEs cresce muito mais depressa que o número de patentes registadas por multinacionais e empresas sem falta de financiamento e e com os laboratórios mais apetrechados. Faz lembrar a frase de Taleb "Stressors are information"]
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It seemed the relationship between the bacteria and the soybeans, far from being a happy friendship, was an uneasy détente, with the plant imposing crippling sanctions on any bacterial partners that failed to earn their keep.
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A spoonful of soil contains more microbial individuals than there are humans on Earth. “It’s the most species-dense habitat we have,” said Edith Hammer, a soil ecologist at Lund University in Sweden. A single plant might be swapping molecules with dozens of fungi — each of which might in turn be canoodling with an equal number of plants. It’s a promiscuous party down there.
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After some time, they measured the fungi’s growth and found that the fungi with phosphorus to trade received much more carbon from the plants.
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The plant with more sugar to trade had received far more fungal phosphorus (which in this experiment was recognizable as the “heavy” isotope phosphorus-32).
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In 2011, Kiers’ team reported in Science that not only can plants reward high-performing fungal partners and punish poor performers, fungi apparently do the same.
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Together, the results turned scientists’ understanding of the plant-fungal relationship on its head. No longer could mycorrhizal fungi be seen as servants or passive accessories to their plant masters. Rather, life forms below the surface control their own fate, just as much as those above. It’s a dynamic marriage of equals.
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She also began developing an economic framework for thinking about relationships between plants and fungi. Based on observations of the free-market system, Kiers suspects that what has stabilized plant-fungal mutualisms for at least 470 million years is not that individual organisms are committed to the good of the community, but rather that, in most cases, both plants and fungi benefit more from trading with each other than from keeping resources to themselves.
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Most impressively, the fungi moved nutrients from the “rich” to the “poor” region and grew faster in the poor region. Kiers’ team believes that’s because the fungi could extract a higher “price” from the plants in the form of carbon-rich sugars where phosphorus was scarce — though Kiers notes that they couldn’t track the carbon directly."
Da fonte 2:
"Given that all of life is connected — whether in the deep evolutionary past, or in current symbiotic relationships (just think about all the bacteria residing in the human gut) — this new understanding of evolutionary history can give us more clues about where we came from. At the very least, “people are recognizing that there’s more diversity out there in the environment,” Dacks said, “and that the nice clean stories just don’t cut it anymore.”"
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