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Abstract

Effect of the ectomycorrhizal fungus Paxillus involutus on growth and cation (potassium, calcium, and magnesium) nutrition of Pinus silvestris L. in semi-hydroponic culture.

A semi-hydroponic culture was used to compare growth and cation nutrition of mycorrhizal (Paxillus involutus) and non-mycorrhizal Scots pine seedlings. When roots and hyphae grew together, concentrations and contents of macronutrients in needles and roots were not significantly different between mycorrhizal and non-mycorrhizal plants. When grown in two separate compartments, root potassium (K) concentrations, concentrations and contents of calcium (Ca) in needles and roots, needle nitrogen (N) concentrations, total N content and contents of root K and Mg were significantly reduced in mycorrhizal plants. Whereas 15N abundance increased in roots of mycorrhizal plants. The results indicated that the extraradical mycelium of the fungus strain used was able to transport N to the plant but did not contribute to long-term cation uptake and growth of host plants. An insufficient supply of macro-elements [N, phosphorus (P)] may account for the reduced growth of mycorrhizal plants and the differences in cation uptake between mycorrhizal and non-mycorrhizal plants.



Zhang, J.; George, E. 2010.Effect of the ectomycorrhizal fungus Paxillus involutus on growth and cation (potassium, calcium, and magnesium) nutrition of Pinus silvestris L. in semi-hydroponic culture. Journal of Plant Nutrition 33, 736-751.