Key words Ectomycorrhiza
Springer Online Journal Archives 1860-2000
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Abstract Seedlings of Chinese pine (Pinus tabulaeformis Carr.) were grown in a growth chamber using a sterilized soil/sand/vermiculite mixture, and were inoculated with the ectomycorrhizal fungus Cenococcum graniforme (Sow.) Ferd. and Winge. The function of external mycelium of ectomycorrhiza for uptake and transport of N from 15N-labeled NH4 + and NO3 – for plant nutrition was evaluated under well-watered conditions and water stress. The pots comprised two-compartments, whereby the penetration of roots was prevented by a nylon mesh bag which the mycorrhizal hyphae were allowed to pass in order to colonize the rest of the pot. 15N-labeled NH4 + or NO3 – was applied to the area of the pot to which the root had no access. At harvest, the 15NH4 + concentration in plant tissues was significantly promoted by the formation of mycorrhizae both under well-watered conditions and water stress. The 15NO3 – concentration was reduced by water stress and increased by mycorrhizal formation. The enhancement of 15NO3 – uptake caused by mycorrhizal formation was more evident under water stress than under well-watered conditions. The external mycelia of the ectomycorrhizae took up and transported NH4 + and NO3 – from the soil to the plant, thereby improving plant nutrition and growth, in addition to helping the plants to avoid the effects of water stress.
Type of Medium: