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Andersson, Solbritt
Publications (5 of 5) Show all publications
Andersson, S., Ek, H. & Söderström, B. (1997). Effects of liming on the uptake of organic and inorganic nitrogen by mycorrhizal (Paxillus involutus) and non-mycorrhizal Pinus sylvestris plants. New Phytologist, 135(4), 763-771
Open this publication in new window or tab >>Effects of liming on the uptake of organic and inorganic nitrogen by mycorrhizal (Paxillus involutus) and non-mycorrhizal Pinus sylvestris plants
1997 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 135, no 4, p. 763-771Article in journal (Refereed) Published
Abstract [en]

Seedlings of Pinus sylvestris L. were grown in Plexiglas(R) observation chambers in limed (CaCO3, pH 5.0 and 5.9) and untreated (pH 4.1) peat. The seedlings were either colonized by the mycorrhizal fungus Paxillus involutus (Batsch: Fr.) Fr. Or were non-mycorrhizal. After 18 wk in the observation chambers, N-15-labelled organic nitrogen, as lyophilized and ground mycelium of Suillus variegatus (Swartz: Fr.) O. Kuntze, or ammonium, was added to the peat. The plants were harvested after an uptake period of 14 d. Irrespective of the nitrogen form added, liming decreased both the content and concentration of N-15 in nonmycorrhizal plants, and, to a lesser extent, those in mycorrhizal plants. In mycorrhizal plants the uptake of N-15 was not correlated with area colonized by the mycorrhizal mycelium. The amount of KCl-extractable N-15 in peat without plants and mycorrhizal fungi decreased with liming. It is proposed that liming induced chemical or microbial immobilization of the added N-15. This is suggested to be the main reason for the decreased uptake of N-15 in lime treatments.

National Category
Biological Sciences
Identifiers
urn:nbn:se:lnu:diva-11593 (URN)10.1046/j.1469-8137.1997.00692.x (DOI)A1997WW80400020 ()
Available from: 2011-05-06 Created: 2011-05-06 Last updated: 2017-12-11Bibliographically approved
Andersson, S., Jensen, P. & Söderström, B. (1996). Effects of mycorrhizal colonization by Paxillus involutus on uptake of Ca and P by Picea abies and Betula pendula grown in unlimed and limed peat. New Phytologist, 133(4), 695-704
Open this publication in new window or tab >>Effects of mycorrhizal colonization by Paxillus involutus on uptake of Ca and P by Picea abies and Betula pendula grown in unlimed and limed peat
1996 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 133, no 4, p. 695-704Article in journal (Refereed) Published
Abstract [en]

Uptake of P(P-32) and Ca(Ca-45) by seedlings of Picea abies (L.) Karst and Betula pendula Roth, non-mycorrhizal or mycorrhizal with Paxillus involutus (Batsch: Fr) Fr. was studied. Seedlings were grown in unamended peat (pH 4.0) or in peat limed (CaO) to pH 5.1 or 6.1. A double-labelled (P-32 and Ca-45) complete nutrient solution was added to the peat 7 wk after planting. An 8 d period was allowed for uptake of the isotopes before the seedlings were harvested. Mycorrhizal colonization clearly increased the uptake of P(P-32) in the unlimed substrate and in the substrate limed to a pH of 5.1. At the highest lime rate, the uptake of P(P-32) was greatly reduced in both mycorrhizal and non-mycorrhizal seedlings. The difference in P uptake between mycorrhizal and non-mycorrhizal seedlings was small at this lime rate. The mycorrhizal colonization of the roots was not affected by liming. However, it is possible that the mycelial growth into the substrate was inhibited. The reduction in uptake could thus be an effect of a lower availability of P in combination with a decreased fungal uptake surface at the highest lime rate. The mycorrhizal effect on uptake of Ca was much smaller than its effect on uptake of P. Mycorrhizal colonization increased the Ca(Ca-45) uptake in the unlimed treatment, where the Ca content in the substrate was very small. In the limed substrates the uptake of Ca was as high or higher in the non-mycorrhizal than in the mycorrhizal seedlings.

National Category
Natural Sciences
Identifiers
urn:nbn:se:lnu:diva-11594 (URN)A1996VE68300016 ()
Available from: 2011-05-06 Created: 2011-05-06 Last updated: 2017-12-11Bibliographically approved
Andersson, S. & Söderström, B. (1995). Effects of lime (CaCO3) on ectomycorrhizal colonization of Picea abies (L) KARST - seedlings planted in a spruce forest. Scandinavian Journal of Forest Research, 10(2), 149-154
Open this publication in new window or tab >>Effects of lime (CaCO3) on ectomycorrhizal colonization of Picea abies (L) KARST - seedlings planted in a spruce forest
1995 (English)In: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 10, no 2, p. 149-154Article in journal (Refereed) Published
Abstract [en]

In two consecutive years, seedlings of Norway spruce (Picea abies) were planted in a 50-yr-old Norway spruce forest in limed (3.8 tons CaCO3 ha-1) and control plots. After 6 months they were harvested and the mycorrhizal status of the roots was analysed. Six types of mycorrhiza were distinguished. Three decreased after liming, two increased and one was not affected consistently by the liming. The effects on the total mycorrhizal colonization of the roots were opposite for the two years, indicating that the effects of liming are influenced strongly by other environmental factors. Statistical analysis also revealed pronounced natural variation in space. An inventory of the sporocarp-producing fungi showed that the number of saprotrophic species producing sporocarps was significantly higher in the limed plots whereas the number of ectomycorrhizal species was lower in the limed plots, compared with the control plots. It is concluded that more information is needed concerning the effects of liming on different soil types before any general conclusions can be made about its effects on mycorrhizal colonization.

National Category
Natural Sciences
Identifiers
urn:nbn:se:lnu:diva-11595 (URN)A1995QX56900006 ()
Available from: 2011-05-06 Created: 2011-05-06 Last updated: 2017-12-11Bibliographically approved
EK, H., Andersson, S., Arnebrant, K. & Söderström, B. (1994). Growth and assimilation of NH4+ and NO3- by Paxillus involutus in association with Betula pendula and Picea abies as affected by subtrate pH. New Phytologist, 128(4), 629-637
Open this publication in new window or tab >>Growth and assimilation of NH4+ and NO3- by Paxillus involutus in association with Betula pendula and Picea abies as affected by subtrate pH
1994 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 128, no 4, p. 629-637Article in journal (Refereed) Published
Abstract [en]

The influence of pH on the growth and assimilation of N-15-labelled ammonium and nitrate was studied in intact ectomycorrhizal systems consisting of Betula pendula Roth and Picea abies (L.) Karst. colonized with a common mycelium of Paxillus involutus (Batsch) Fr. The plants were grown together in Plexiglass observation chambers containing non-sterile peat with three different pH values, 4.0, 5.1 and 6.1. The mycorrhizal mycelium was allowed to grow over a barrier into an area of peat from which plant roots were excluded. Labelled NH4NO3 was supplied, either as (NH4NO3)-N-15 or as (NH4NO3)-N-15, exclusively to the fungal mycelium. Shoots and roots were analyzed for N-15 in total nitrogen while the mycelium was analyzed for N-15 in NH4+, NO3- and free amino acids. The N-15 labelling pattern indicated that ammonium was immediately assimilated into amino acids, primarily glutamine, by the fungal mycelium at the uptake site. The amino acids were then translocated to the mycorrhizal roots. In contrast, nitrate-N was not assimilated in the mycelium but rather transferred to the mycorrhizal roots as nitrate. Mycelial uptake and transfer of N to the spruce and birch seedlings were significantly higher for NH4-N than for NO3-N. No firm conclusions about pH effects on the preferential uptake of ammonium and nitrate could be drawn. However, pH had a pronounced effect on the mycelial growth of P. involutus which was hampered severely at pH 6.1 and to a lesser extent at pH 5.1.

National Category
Ecology
Identifiers
urn:nbn:se:lnu:diva-11596 (URN)A1994QC62600006 ()
Available from: 2011-05-06 Created: 2011-05-06 Last updated: 2017-12-11Bibliographically approved
Erland, S., Söderström, B. & Andersson, S. (1990). Effects of liming on ectomycorrhizal fungi infection Pinus sylvestris L .2. Growth-rates in pure culture at different pH values compared to growth-rates in symiosis with the host plant. New Phytologist, 115(4), 683-688
Open this publication in new window or tab >>Effects of liming on ectomycorrhizal fungi infection Pinus sylvestris L .2. Growth-rates in pure culture at different pH values compared to growth-rates in symiosis with the host plant
1990 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 115, no 4, p. 683-688Article in journal (Refereed) Published
National Category
Ecology
Identifiers
urn:nbn:se:lnu:diva-11597 (URN)A1990DY70300013 ()
Available from: 2011-05-06 Created: 2011-05-06 Last updated: 2017-12-11Bibliographically approved

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