Determination of the nitrogen source for arbuscular mycorrhizal fungi by 15N application to soil and plants |
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| Authors: | A. Nakano Kazushi Takahashi Roger T. Koide M. Kimura |
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| Affiliation: | (1) Laboratory of Soil Biology and Chemistry, School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464–8601, Japan e-mail: kimuram@nuagr1.agr.nagoya-u.ac.jp Fax: +81-52-7894136, JP;(2) Toyota Biotechnology and Afforestation Laboratory, 1099 Marune, Kurozasa, Miyoshi-cho, Nishikamo-gun, Aichi 470–0201, Japan, JP;(3) Department of Horticulture, The Pennsylvania State University, University Park, PA 16802–4200, USA, US |
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| Abstract: | The source of nitrogen in the spores of arbuscular mycorrhizal (AM) fungi was quantified by a 15N-labeling technique. N was applied as coated urea to the soil and in solution to plant shoots. Soil-applied fertilizer had a significant effect on spore % 15N (P<0.01), with a 24–75% contribution to spore N. Fertilizer applied to either alfalfa shoots or bahia grass shoots had little effect on spore % 15N, accounting for 0–14% or 1–9% of spore N, respectively. These results indicate that AM fungi obtain spore N mostly from the soil. The small amount of spore N originating from shoot-applied N may have been obtained via root exudation. Accepted: 6 November 2000 |
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| Keywords: | Arbuscular mycorrhizal fungi Nitrogen source 15N Soil mineral N |
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