Fungal carbohydrate support in the ectomycorrhizal symbiosis: a review.

摘要: Ectomycorrhizal (ECM) symbiosis is a mutualistic interaction between certain soil fungi and fine roots of perennial plants, mainly forest trees, by which both partners become capable efficiently colonising nutrient-limited environments. The success this reflected in the dominance ECM ecosystems Northern hemisphere. Apart from their economic importance (wood production), are essential for large-scale carbon sequestration, leading to substantial reductions anthropogenic CO(2) release. biological function exchange fungus-derived mineral nutrients plant-derived carbohydrates. Improved plant nutrition as result interaction, however, has price. Together with fungal partner, root systems plants can receive about half photosynthetically fixed carbon. To enable such strong carbohydrate sink, monosaccharide uptake capacity flux through glycolysis intermediate storage pools (trehalose and/or mannitol) mycorrhizal strongly increased at plant-fungus interface. store, trehalose/mannitol additionally considered be involved allocation within colony. Dependent on species symbiosis, regulation fine-tuning metabolism seems controlled either developmental mechanisms or apoplastic sugar content. As consequence demand trees increase photosynthetic capacity. In addition, host control restrict towards partner avoid parasitism. behind phenomenon still largely unknown but rates local sucrose hydrolysis hexose rhizodermal cells thought under conditions (e.g., reduced nutrient export).