Fungal species-specific responses of ectomycorrhizal Scots pine (Pinus sylvestris) to elevated [CO2]

• Published in: The New phytologist Vol. 146; no. 1; pp. 163 - 168
• Main Authors: GORISSEN, A., KUYPER, TH. W.
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 01.04.2000; Blackwell
• Subjects: Agronomy. Soil science and plant productions; Atmospherics; Biological and medical sciences; carbon allocation; Carbon dioxide; Economic plant physiology; ectomycorrhiza; elevated [CO2]; Fundamental and applied biological sciences. Psychology; Fungi; Nitrogen; Parasitism and symbiosis; Pine trees; Pinus sylvestris; Plant physiology and development; Plant roots; Plants; Radiocarbon; Scots pine; Seedlings; Soil air; Symbiosis; Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...); ectomycorrhiza; Scots pine; Pinus sylvestris; carbon allocation; elevated [CO2]; Symbiosis; Translocation; Symbionte; Nutrition; Carbon dioxide; Basidiomycetes; Species specificity; Biomass; Concentration; Nitrogen; Fungi; Medium enrichment; Softwood forest tree; Gymnospermae; Mycorrhiza; Nutrient; Ectomycorrhiza; Coniferales; Spermatophyta; Biological accumulation; Thallophyta
• ISSN: 0028-646X; 1469-8137
• DOI: 10.1046/j.1469-8137.2000.00610.x

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.