Fungal species-specific responses of ectomycorrhizal Scots pine (Pinus sylvestris) to elevated [CO2]
Ectomycorrhizal seedlings of Scots pine (Pinus sylvestris) inoculated with the nitrotolerant Laccaria bicolor and the nitrophobic Suillus bovinus were exposed to ambient (350 μl l−1) and elevated (700 μl l−1) [CO2]. After 79 d the seedlings were labelled for 28 d with 14CO2, after which they were ha...
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Published in | The New phytologist Vol. 146; no. 1; pp. 163 - 168 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Cambridge, UK
Cambridge University Press
01.04.2000
Blackwell |
Subjects | |
Online Access | Get full text |
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Summary: | Ectomycorrhizal seedlings of Scots pine (Pinus sylvestris) inoculated with the nitrotolerant Laccaria bicolor and the
nitrophobic Suillus bovinus were exposed to ambient (350 μl l−1) and elevated (700 μl l−1) [CO2]. After 79 d the
seedlings were labelled for 28 d with 14CO2, after which they were harvested. 14C was determined in shoots, roots
plus mycorrhizas, soil, and below-ground respiration; nitrogen was determined in shoots and roots. Total net 14C
uptake increased under elevated [CO2]. The extra carbon did not increase the shoot mass but was translocated to
the roots and resulted in a decreased shoot-to-root ratio in the Suillus-inoculated seedlings. Laccaria-inoculated
seedlings did not incorporate the additional carbon in root or fungal tissue but only increased below-ground
respiration. S. bovinus acquired or transferred nitrogen better than L. bicolor and enabled the seedlings to perform
better with regard to net carbon uptake under elevated [CO2]. This resulted in nitrogen concentrations in shoots
of Suillus-inoculated seedlings that were twice as high as in Laccaria-inoculated seedlings, irrespective of [CO2].
The higher nitrogen concentration in the shoots resulted in a doubling of the 14C uptake per unit shoot mass. Our
results suggest that the ability of ectomycorrhizal Scots pine seedlings to respond positively to elevated
atmospheric [CO2] is strongly fungal-species specific. |
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ISSN: | 0028-646X 1469-8137 |
DOI: | 10.1046/j.1469-8137.2000.00610.x |