Rosling Anna, Lindahl Björn D, Finlay Roger D
Department of Forest Mycology and Pathology, SLU, PO Box 7026, SE-750 07 Uppsala, Sweden.
New Phytol. 2004 Jun;162(3):795-802. doi: 10.1111/j.1469-8137.2004.01080.x.
• Ectomycorrhizal fungi occur abundantly in the mineral horizons of forest soils, but their interactions with mineral substrates are largely unknown. We have examined the proliferation of ectomycorrhizal roots and mycelium colonising different mineral substrates. • By exposing the shoots of Pinus sylvestris seedlings to air containing CO , the carbon allocation patterns in intact ectomycorrhizal associations could be monitored using electronic autoradiography. • In plants colonised by either Hebeloma crustuliniforme or Piloderma fallax, a larger fraction of the photosynthetically derived carbon was allocated to a mineral soil substrate compared with a Sphagnum peat. In mycorrhizal seedlings colonised by H. crustuliniforme, carbon allocation was significantly greater to roots and mycelia colonising patches of pure potassium feldspar than to those in patches of quartz. • These results suggest that ectomycorrhizal mycelia may respond to the presence of different mineral substrates by regulating their growth and activity.
• 外生菌根真菌大量存在于森林土壤的矿质层中，但其与矿质底物的相互作用在很大程度上尚不明确。我们研究了定殖于不同矿质底物上的外生菌根根系和菌丝体的增殖情况。
• 通过将樟子松幼苗的地上部分暴露于含有二氧化碳的空气中，可利用电子放射自显影技术监测完整外生菌根共生体中的碳分配模式。
• 在被皮壳状疣孢菌或落叶皮盘菌定殖的植物中，与泥炭藓泥炭相比，光合衍生碳分配到矿质土壤底物中的比例更大。在被皮壳状疣孢菌定殖的菌根幼苗中，定殖于纯钾长石斑块的根系和菌丝体的碳分配显著高于定殖于石英斑块的根系和菌丝体。
• 这些结果表明，外生菌根菌丝体可能通过调节其生长和活性来响应不同矿质底物的存在。
