Research Topic: arbuscular mycorrhiza

Root anatomy governs bi-directional resource transfer in mycorrhizal symbiosis

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Researchers developed a new theory explaining how plant roots and fungi work together to exchange nutrients and carbon. The theory shows that thicker roots are less efficient at absorbing nutrients on their own, but mycorrhizal fungi help by positioning themselves in the inner layers of roots to reduce the energy cost of nutrient transport. This partnership between roots and fungi becomes increasingly important for thicker roots, explaining why many plants with thick roots depend more heavily on fungal partners for survival.

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Research landscape of experiments on global change effects on mycorrhizas

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Scientists conducted a comprehensive survey of research on how mycorrhizal fungi (underground fungi that partner with plant roots) respond to global environmental changes like drought and pollution. They found that most research focuses on just one stressor at a time, with very few studies examining how multiple environmental changes together affect these important fungi. The research also showed significant geographic biases, with most studies concentrated in developed countries, leaving major knowledge gaps about mycorrhizal responses in understudied regions.

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Towards understanding the impact of mycorrhizal fungal environments on the functioning of terrestrial ecosystems

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Mycorrhizal fungi form partnerships with plant roots and profoundly influence soil health and carbon storage. Different types of these fungi (arbuscular, ectomycorrhizal, and ericoid) work differently and create distinct soil environments with varying impacts on nutrient availability and carbon cycling. Researchers have now developed a unified framework and an experimental system to better understand and measure these effects, which could improve our ability to manage soils and predict ecosystem responses to environmental changes.

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Arbuscular mycorrhiza suppresses microbial abundance, and particularly that of ammonia oxidizing bacteria, in agricultural soils

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This study examined how beneficial fungal partners of plants (arbuscular mycorrhizal fungi) affect soil bacteria that convert ammonia to nitrate. Using 50 different soils from Czech agricultural fields, researchers found that these fungi suppress ammonia-oxidizing bacteria, but surprisingly this happens even when ammonia levels in soil are high. The findings suggest the relationship between these microorganisms is more complex than simple competition for nutrients.

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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.

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Starve or share? Phosphate availability shapes plant–microbe interactions

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Plants need phosphate to survive, but it’s hard to find in soil. To solve this problem, plants partner with beneficial fungi and bacteria that help them absorb more phosphate. A master control system inside plants called PHR decides whether to be friendly with these helpful microbes or to defend against harmful ones, depending on how much phosphate is available. This clever system helps plants thrive even when nutrients are scarce.

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Arbuscular mycorrhiza suppresses microbial abundance, and particularly that of ammonia oxidizing bacteria, in agricultural soils

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This study examined how a common soil fungus called arbuscular mycorrhiza affects bacteria and archaea that process ammonia in agricultural soils. Using 50 different soils from the Czech Republic, researchers found that the fungus suppresses ammonia-oxidizing bacteria but not archaea. Interestingly, the fungus actually increased ammonia levels in soil rather than depleting them, suggesting the suppression works through mechanisms beyond simple competition for nutrients.

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