symbiosis – Page 2

In vitro interactions between Bradyrhizobium spp. and Tuber magnatum mycelium

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Scientists have successfully grown white truffle mycelium in the laboratory for the first time by discovering its natural partnership with nitrogen-fixing bacteria called Bradyrhizobium. These bacteria and the truffle mycelium need each other to survive and grow together on culture medium. This breakthrough could revolutionize white truffle cultivation, which is currently difficult and expensive, by allowing farmers to grow truffle-producing plants more efficiently in controlled conditions.

Intracellular accommodation of bacteria, fungi, and oomycetes by plants analyzed using transmission electron microscopy

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Scientists used high-powered electron microscopes to examine how plants host different microorganisms inside their cells. They found that whether the microorganism is a helpful nitrogen-fixing bacterium, a nutrient-exchanging fungus, or a disease-causing oomycete, plants always separate it from the rest of the cell with a special membrane. This study reveals fundamental similarities in how plants accommodate different types of microorganisms, despite the very different outcomes for the plant.

Effects and molecular mechanism of endophytic elicitors on the accumulation of secondary metabolites in medicinal plants

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This review explains how beneficial fungi living inside medicinal plants can boost the production of healing compounds. These endophytic fungi act as natural triggers that activate the plant’s own defense systems, causing it to produce more of the valuable medicinal substances used in traditional and modern medicine. By understanding how this process works, scientists can develop better methods to grow medicinal plants and produce natural drugs more sustainably without depleting wild plant populations.

Comparative transcriptome analysis reveals the role of sugar signaling in response to high temperature stress in Armillaria gallica

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Scientists studied how a fungus called Armillaria gallica responds to high heat, which is important because this fungus forms a partnership with a valuable medicinal plant called Gastrodia elata. They compared a heat-tolerant fungal strain with a heat-sensitive one and found that the heat-tolerant strain increases sugar accumulation and activates specific genes that help it survive hot conditions. Adding sucrose to the fungus’s growth medium helped it tolerate heat better, suggesting that sugar plays a key role in heat stress protection.

Fungal alkaloids mediate defense against bruchid beetles in field populations of an arborescent ipomoea

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Morning glory trees (Ipomoea murucoides) form beneficial relationships with fungal partners that live inside their tissues and produce toxic compounds called alkaloids. These alkaloids accumulate in the tree’s seeds and protect them from beetle damage. Trees hosting the common fungal partner Ceramothyrium produce more of the protective alkaloid swainsonine and suffer less seed damage than those with a different fungal partner, demonstrating how this natural partnership helps the plant defend its offspring.

From seagrass roots to saline soils: discovery of two new genera in Lulworthiales (Sordariomycetes) from osmotically stressed habitats

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Scientists discovered two previously unknown types of fungi – one living in the roots of seagrass in Mauritius and another found in salty soils in the Czech Republic. These fungi belong to a special group that thrives in salty environments. By studying their DNA and physical characteristics, researchers confirmed these are entirely new species and determined where they fit in the fungal family tree. The findings suggest that these salt-loving fungi are more widespread than previously thought and can live in both ocean and inland salty habitats.

Cellular anatomy of arbuscular mycorrhizal fungi

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Arbuscular mycorrhizal fungi are special underground fungi that form partnerships with plant roots to help plants grow. Unlike most cells, these fungi form long, tube-like structures without walls dividing them into sections, allowing nutrients and other materials to flow freely throughout their networks. This review explains how these fungi are built at the cellular level, including their walls, membranes, and internal structures, helping scientists better understand how they exchange nutrients with plants and contribute to healthy ecosystems.

Digging into the evolutionary history of the fungus-growing-ant symbiont, Escovopsis (Hypocreaceae)

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Researchers studied fungi called Escovopsis that live in ant colonies and interact with the fungi that ants farm for food. By examining 309 fungal samples from across Central and South America, they discovered that these fungi originated 57 million years ago but only started living with the ants about 38 million years ago. Over time, Escovopsis evolved to grow faster and reproduce more efficiently, likely helping it survive in the ant colony environment.

Comparative transcriptome analyses and CRISPR/Cas9-mediated functional study of Tfsdh1 reveal insights into the interaction between Tremella fuciformis and Annulohypoxylon stygium

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White wood ear fungus (Tremella fuciformis) is a popular medicinal mushroom that cannot grow on its own in nature. Researchers studied how it interacts with a companion fungus and discovered that a specific gene called Tfsdh1 is crucial for the mushroom to use sorbitol sugar and grow properly. By using advanced genetic tools to remove this gene, they showed it’s essential for the relationship between the two fungi, offering insights into how to better cultivate this nutritious mushroom.

Fungal pathogens and symbionts: Living off the fat of the land

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Certain fungi that live exclusively in or on hosts have evolved a clever survival strategy: they stopped making their own fatty acids and instead steal them from their hosts. This includes fungi that cause pneumonia in immunocompromised patients, yeasts on skin, and beneficial fungi that help plants absorb nutrients from soil. By examining how these fungi scavenge fatty acids from their hosts, scientists hope to develop better treatments and diagnostic tools for fungal infections.

Research Topic: symbiosis