Browsing by Subject "Plants"

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  • Halmeenmäki, Elisa; Heinonsalo, Jussi; Putkinen, Anuliina; Santalahti, Minna; Fritze, Hannu; Pihlatie, Mari (2017)
    The contribution of boreal forest plants to the methane (CH4) cycle is still uncertain. We studied the above and belowground CH4 fluxes of common boreal plants, and assessed the possible contribution of CH4 producing and oxidizing microbes (methanogens and methanotrophs, respectively) to the fluxes. We measured the CH4 fluxes and the amounts of methanogens and methanotrophs in the above- and belowground parts of Vaccinium myrtillus, Vaccinium vitis-idaea, Calluna vulgaris and Pinus sylvestris seedlings and in non-planted soil in a microcosm experiment. The shoots of C. vulgaris and P. sylvestris showed on average emissions of CH4, while the shoots of the Vaccinium species indicated small CH4 uptake. All the root-soil-compartments consumed CH4, however, the non-rooted soils showed on average small CH4 emission. We found methanotrophs from all the rooted and non-rooted soils. Methanogens were not detected in the plant or soil materials. The presence of plant roots seem to increase the amount of methanotrophs and thus CH4 uptake in the soil. The CH4 emissions from the shoots of C. vulgaris and P. sylvestris demonstrate that the plants have an important contribution to the CH4 exchange dynamics in the plant-soil systems.
  • Buchmann, Jan P.; Löytynoja, Ari; Wicker, Thomas; Schulman, Alan H. (2014)
    Background CACTA elements are DNA transposons and are found in numerous organisms. Despite their low activity, several thousand copies can be identified in many genomes. CACTA elements transpose using a 'cut-and-paste' mechanism, which is facilitated by a DDE transposase. DDE transposases from CACTA elements contain, despite their conserved function, different exon numbers among various CACTA families. While earlier studies analyzed the ancestral history of the DDE transposases, no studies have examined exon loss and gain with a view of mechanisms that could drive the changes. Results We analyzed 64 transposases from different CACTA families among monocotyledonous and eudicotyledonous host species. The annotation of the exon/intron boundaries showed a range from one to six exons. A robust multiple sequence alignment of the 64 transposases based on their protein sequences was created and used for phylogenetic analysis, which revealed eight different clades. We observed that the exon numbers in CACTA transposases are not specific for a host genome. We found that ancient CACTA lineages diverged before the divergence of monocotyledons and eudicotyledons. Most exon/intron boundaries were found in three distinct regions among all the transposases, grouping 63 conserved intron/exon boundaries. Conclusions We propose a model for the ancestral CACTA transposase gene, which consists of four exons, that predates the divergence of the monocotyledons and eudicotyledons. Based on this model, we propose pathways of intron loss or gain to explain the observed variation in exon numbers. While intron loss appears to have prevailed, a putative case of intron gain was nevertheless observed
  • Bergroth, Ivar Ossian, 1868-1904. (Helsinki : Societas pro fauna et flora Fennica, 1894)
    Acta Societatis pro Fauna et Flora Fennica; 11, 3
  • Renvall, August, 1884-1925. (Helsingfors : J. Simelii arvingars boktr., 1912)
  • Lindberg, Harald, 1871- (Helsingfors : Söderström, 1901)
  • Alcenius, Otto, 1838-1913. (Helsingfors : J. Simelii, 1863)
  • Hisinger, Edvard Victor Eugen, Freiherr, 1832-1904. (Helsingfors : H. C. Friis, 1855)
  • Prytz, Lars Johan, 1789-1823.; Hjelt, Otto E. A. (Otto Edvard August), 1823-1913. ([Helsingfors], 1869)
    Notiser ur Sällskapets pro fauna et flora Fennica förhandlingar; 10
  • Hamberg, Knut Herman Rudolf, 1873-1920. (Stockholm : Isaac Marcus, 1897)
  • Helsingin yliopisto. Kasvimuseo.; Saelan, Th. (Thiodolf), 1834-1921.; Bomansson, J. O. (John Oskar), 1838-1906.; Societas pro Fauna et Flora Fennica.; Kihlman, A. Osw.; Hjelt, Hj.; Brotherus, V. F. (Helsingforsiae : Ex officina typographica heredum J. Simelii, 1889)
  • Vainio, Edv. A. (Edvard August), 1853-1929. (Helsingissä : J.C. Frenckell ja Pojan kirjapainossa, 1878)
  • Hovatta, Iiris; Hovatta, Outi (2018)
  • Lindsberg, Perttu J.; Haltia, Matti (2018)
  • Mela, A. J. (Aukusti Juhana), 1846-1904. (Helsinki : Suomalaisen Kirjallisuuden Seura, 1877)
    Suomalaisen Kirjallisuuden Seuran toimituksia. 53
  • Societas pro Fauna et Flora Fennica. (Helsingfors [Societas pro Fauna et Flora Fennica], 1902)
    Meddelanden af Societas pro Fauna et Flora Fennica; 28-30
  • Societas pro Fauna et Flora Fennica. (Helsingfors [Societas pro Fauna et Flora Fennica], 1911)
    Meddelanden af Societas pro Fauna et Flora Fennica; 37-39
  • Societas pro Fauna et Flora Fennica. (Helsingfors [Societas pro Fauna et Flora Fennica], 1914)
    Meddelanden af Societas pro Fauna et Flora Fennica; 40-42
  • Societas pro Fauna et Flora Fennica. (Helsingfors [Societas pro Fauna et Flora Fennica], 1906)
    Meddelanden af Societas pro Fauna et Flora Fennica; 31-33
  • Societas pro Fauna et Flora Fennica. (Helsingfors [Societas pro Fauna et Flora Fennica], 1893)
    Meddelanden af Societas pro Fauna et Flora Fennica; 19-24
  • Societas pro Fauna et Flora Fennica. (Helsingfors [Societas pro Fauna et Flora Fennica], 1908)
    Meddelanden af Societas pro Fauna et Flora Fennica; 34-36