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  • 1.
    Andersson, Solbritt
    et al.
    Ekologiska institutionen, Lunds Universitet.
    Ek, Hans
    Ekologiska institutionen, Lunds Universitet.
    Söderström, Bengt
    Ekologiska institutionen, Lunds Universitet.
    Effects of liming on the uptake of organic and inorganic nitrogen by mycorrhizal (Paxillus involutus) and non-mycorrhizal Pinus sylvestris plants1997Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 135, nr 4, s. 763-771Artikel i tidskrift (Refereegranskat)
    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.

  • 2.
    Andersson, Solbritt
    et al.
    Ekologiska institutionen, Lunds Universitet.
    Jensen, Paul
    Söderström, Bengt
    Effects of mycorrhizal colonization by Paxillus involutus on uptake of Ca and P by Picea abies and Betula pendula grown in unlimed and limed peat1996Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 133, nr 4, s. 695-704Artikel i tidskrift (Refereegranskat)
    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.

  • 3.
    EK, Hans
    et al.
    Ekologiska Institutionen, Lunds Universitet.
    Andersson, Solbritt
    Ekologiska Institutionen, Lunds Universitet.
    Arnebrant, Kristina
    Ekologiska Institutionen, Lunds Universitet.
    Söderström, Bengt
    Ekologiska Institutionen, Lunds Universitet.
    Growth and assimilation of NH4+ and NO3- by Paxillus involutus in association with Betula pendula and Picea abies as affected by subtrate pH1994Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 128, nr 4, s. 629-637Artikel i tidskrift (Refereegranskat)
    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.

  • 4.
    Erland, Susanne
    et al.
    Ekologiska Institutionen, Lunds Universitet.
    Söderström, Bengt
    Ekologiska Institutionen, Lunds Universitet.
    Andersson, Solbritt
    Ekologiska Institutionen, Lunds Universitet.
    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 plant1990Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 115, nr 4, s. 683-688Artikel i tidskrift (Refereegranskat)
  • 5.
    Kumarathunge, Dushan P.
    et al.
    Western Sydney University, Australia;Coconut Research Institute of Sri Lanka, Sri Lanka.
    Medlyn, Belinda E.
    Western Sydney University, Australia.
    Drake, John E.
    State University of New York, USA.
    Tjoelker, Mark G.
    Western Sydney University, Australia.
    Aspinwall, Michael J.
    University of North Florida, USA.
    Battaglia, Michael
    CSIRO Agriculture and Food, Australia.
    Cano, Francisco J.
    Western Sydney University, Australia.
    Carter, Kelsey R.
    Michigan Technological University, USA.
    Cavaleri, Molly A.
    Michigan Technological University, USA.
    Cernusak, Lucas A.
    James Cook University, Australia.
    Chambers, Jeffrey Q.
    University of California Berkeley, USA.
    Crous, Kristine Y.
    Western Sydney University, Australia.
    De Kauwe, Martin G.
    University of New South Wales, Australia.
    Dillaway, Dylan N.
    Unity College, USA.
    Dreyer, Erwin
    Université de Lorraine, France.
    Ellsworth, David S.
    Western Sydney University, Australia.
    Ghannoum, Oula
    Western Sydney University, Australia.
    Han, Qingmin
    Forestry and Forest Products Research Institute (FFPRI), Japan.
    Hikosaka, Kouki
    Tohoku University, Japan.
    Jensen, Anna M.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för skog och träteknik (SOT).
    Kelly, Jeff W. G.
    University of Washington, USA.
    Kruger, Eric L.
    University of Wisconsin‐Madison, USA.
    Mercado, Lina M.
    University of Exeter, UK;Centre for Ecology and Hydrology, UK.
    Onoda, Yusuke
    Kyoto University, Japan.
    Reich, Peter B.
    Western Sydney University, Australia.
    Rogers, Alistair
    Brookhaven National Laboratory, USA.
    Slot, Martijn
    Smithsonian Tropical Research Institute, Panama.
    Smith, Nicholas G.
    Texas Tech University, USA.
    Tarvainen, Lasse
    Swedish University of Agricultural Sciences, Sweden;University of Gothenburg, Sweden.
    Tissue, David T.
    Western Sydney University, USA.
    Togashi, Henrique F.
    Macquarie University, Australia.
    Tribuzy, Edgard S.
    Universidade Federal do Oeste do Pará (UFOPA), Brazil.
    Uddling, Johan
    University of Gothenburg, Sweden.
    Vårhammar, Angelica
    Western Sydney University, Australia.
    Wallin, Göran
    University of Gothenburg, Sweden.
    Warren, Jeffrey M.
    Oak Ridge National Laboratory, USA.
    Way, Danielle A.
    The University of Western Ontario, Canada;Duke University, USA.
    Acclimation and adaptation components of the temperature dependence of plant photosynthesis at the global scale2019Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 222, nr 2, s. 768-784Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The temperature response of photosynthesis is one of the key factors determining predicted responses to warming in global vegetation models (GVMs). The response may vary geographically, owing to genetic adaptation to climate, and temporally, as a result of acclimation to changes in ambient temperature. Our goal was to develop a robust quantitative global model representing acclimation and adaptation of photosynthetic temperature responses.

    We quantified and modelled key mechanisms responsible for photosynthetic temperature acclimation and adaptation using a global dataset of photosynthetic CO2 response curves, including data from 141 C3 species from tropical rainforest to Arctic tundra. We separated temperature acclimation and adaptation processes by considering seasonal and common-garden datasets, respectively.

    The observed global variation in the temperature optimum of photosynthesis was primarily explained by biochemical limitations to photosynthesis, rather than stomatal conductance or respiration. We found acclimation to growth temperature to be a stronger driver of this variation than adaptation to temperature at climate of origin.

    We developed a summary model to represent photosynthetic temperature responses and showed that it predicted the observed global variation in optimal temperatures with high accuracy. This novel algorithm should enable improved prediction of the function of global ecosystems in a warming climate.

  • 6.
    Norby, Richard J.
    et al.
    Oak Ridge National Laboratory, USA.
    Gu, Lianhong
    Oak Ridge National Laboratory, USA.
    Haworth, Ivan C.
    Oak Ridge National Laboratory, USA.
    Jensen, Anna M.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för skog och träteknik (SOT). Oak Ridge National Laboratory, USA.
    Turner, Benjamin L.
    Smithsonian Tropical Research Institute, Panama.
    Walker, Anthony P.
    Oak Ridge National Laboratory, USA.
    Warren, Jeffrey M.
    Oak Ridge National Laboratory, USA.
    Weston, David J.
    Oak Ridge National Laboratory, USA.
    Xu, Chonggang
    Los Alamos National Laboratory, USA.
    Winter, Klaus
    Smithsonian Tropical Research Institute, Panama.
    Informing models through empirical relationships between foliar phosphorus, nitrogen and photosynthesis across diverse woody species in tropical forests of Panama2017Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 215, nr 4, s. 1425-1437Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Our objective was to analyze and summarize data describing photosynthetic parameters and foliar nutrient concentrations from tropical forests in Panama to inform model representation of phosphorus (P) limitation of tropical forest productivity.

    Gas exchange and nutrient content data were collected from 144 observations of upper canopy leaves from at least 65 species at two forest sites in Panama, differing in species composition, rainfall and soil fertility. Photosynthetic parameters were derived from analysis of assimilation rate vs internal CO2 concentration curves (A/Ci), and relationships with foliar nitrogen (N) and P content were developed.

    The relationships between area-based photosynthetic parameters and nutrients were of similar strength for N and P and robust across diverse species and site conditions. The strongest relationship expressed maximum electron transport rate (Jmax) as a multivariate function of both N and P, and this relationship was improved with the inclusion of independent data on wood density.

    Models that estimate photosynthesis from foliar N would be improved only modestly by including additional data on foliar P, but doing so may increase the capability of models to predict future conditions in P-limited tropical forests, especially when combined with data on edaphic conditions and other environmental drivers.

  • 7.
    Palovaara, Joakim
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Hallberg, Henrik
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Stasolla, Claudio
    Plant Science, University of Manitoba.
    Hakman, Inger
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Comparative expression pattern analysis of WUSCHEL-related homeobox 2 (WOX2) and WOX8⁄9 in developing seeds and somatic embryos of the gymnosperm Picea abies2010Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 188, nr 1, s. 122-135Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In seed plants, current knowledge concerning embryonic pattern formation by polar auxin transport (PAT) and WUSCHEL-related homeobox (WOX) gene activity is primarily derived from studies on angiosperms, while less is known about these processes in gymnosperms. In view of the differences in their embryogeny, and the fact that somatic embryogenesis is used for mass propagation of conifers, a better understanding of embryo development is vital.

    The expression patterns of PaWOX2 and PaWOX8/9 were followed with quantitative reverse transcription–polymerase chain reaction (qRT-PCR) and in situ hybridization (ISH) during seed and somatic embryo development in Norway spruce (Picea abies), and in somatic embryos treated with the PAT inhibitor N-1-naphthylphthalamic acid (NPA).

    Both PaWOX2 and PaWOX8/9 were highly expressed at the early growth stages of zygotic and somatic embryos, and shared a similar expression pattern over the entire embryo. At later embryo stages, high expression of PaWOX8/9 became restricted to cotyledon primordia, epidermis, procambium and root apical meristem (RAM), which became most evident in NPA-treated somatic embryos, while expression of PaWOX2 was much lower.

    Our results suggest an ancestral role of WOX in seed plant embryo development, and strengthen the proposed connection between PAT, PIN-FORMED (PIN) and WOX in the regulation of embryo patterning in seed plants.

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

  • 8.
    Rosenstock, Nicholas P.
    et al.
    Lund University.
    Berner, Christoffer
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Smits, Mark M.
    Hasselt University, Belgium.
    Kram, Pavel
    Czech Geological Survey, Czech Republic.
    Wallander, Håkan
    Lund University.
    The role of phosphorus, magnesium and potassium availability in soil fungal exploration of mineral nutrient sources in Norway spruce forests2016Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 211, nr 2, s. 542-553Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We investigated fungal growth and community composition in buried meshbags, amended with apatite, biotite or hornblende, in Norway spruce (Picea abies) forests of varying nutrient status. Norway spruce needles and soil collected from forests overlying serpentinite had low levels of potassium and phosphorus, those from granite had low levels of magnesium, whereas those from amphibolite had comparably high levels of these nutrients. We assayed the fungal colonization of meshbags by measuring ergosterol content and fungal community with 454 sequencing of the internal transcribed spacer region. In addition, we measured fine root density. Fungal biomass was increased by apatite amendment across all plots and particularly on the K-and P-deficient serpentinite plots, whereas hornblende and biotite had no effect on fungal biomass on any plots. Fungal community (total fungal and ectomycorrhizal) composition was affected strongly by sampling location and soil depth, whereas mineral amendments had no effect on community composition. Fine root biomass was significantly correlated with fungal biomass. Ectomycorrhizal communities may respond to increased host-tree phosphorus demand by increased colonization of phosphorus-containing minerals, but this does not appear to translate to a shift in ectomycorrhizal community composition. This growth response to nutrient demand does not appear to exist for potassium or magnesium limitation.

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