Search Results - (Author, Cooperation:R. Karjalainen)

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  1. 1
    Staff View
    Publication Date:
    2014-04-30
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    KANGASJÄRVI, J. ; TALVINEN, J. ; UTRIAINEN, M. ; KARJALAINEN, R.

    Oxford, UK : Blackwell Publishing Ltd
    Published 1994
    Staff View
    ISSN:
    1365-3040
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Biology
    Notes:
    Recent advances in the understanding of the molecular basis of plant response to ozone attack are reviewed. Plants grown in elevated atmospheric ozone are known to undergo several biochemical changes before any actual damage can be detected. These reactions include increases in the activities of enzymes associated with general plant defence mechanisms. Ozone exposure often causes a surge in the production of the plant hormone ethylene, as well as changes in polyamine metabolism and increases in the activities of several phenylpropanoid and flavonoid pathway enzymes. The activities of superoxide dismutase and peroxidases that protect cells from the oxidative damage caused by hydroxyl radicals, H2O2 and superoxides also increase. However, ozone-induced changes in plant cells at the gene level are almost unknown. The limited data available suggest close similarities between ozone-induced and pathogen-induced defence responses in plants. Several general defence genes that have been cloned in other studies will soon be applied to studies of gene expression in ozone-exposed plants. The use of molecular biological tools in ozone research should enable the development of highly specific and sensitive molecular markers for biomonitoring ozone-induced injuries in plants.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-3040.1994.tb00173.x

    Articles: DFG German National Licenses
  3. 3
    LILJA, A. ; HIETALA, A. M. ; KARJALAINEN, R.

    Oxford, UK : Blackwell Publishing Ltd
    Published 1996
    Staff View
    ISSN:
    1365-3059
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    Finnish and Norwegian uninucleate Rhizoctonia sp, isolates. originating from roots of nursery grown conifer seedlings suffering from root dieback, and having Ceratobasidium perfect state, were tested for pathogenicity and genetic related ness. All tested isolates of this pathogen considerably reduced the root system development of Scots pine and Norway spruce seedlings resulting in death or stunted growth. The uninucleate isolates anastomosed readily with each other producing a killing reaction. In a RAPD-PCR analysis, the uninucleate isolates had different banding patterns from our reference isolates, two Finnish binucleate isolates (AG-I and R. sp.) and standard tester isolates of genus Ceratobasidium representing anastomosis groups AG-A, AG-C, AG-E, AG-G and AG-I. UPGMA analysis clustered the uninucleate isolates together at a greater similarity than 75% while the binucleate isolates formed distinct clusters and were 10-25% similar to the uninucleate Rhizoctonia sp. Hyphal anastomosis and DNA data suggest that the uninucleate Rhizocionia sp. is an homogeneous group and distinct from the tested binucleate Rhizoctonia isolates.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-3059.1996.tb02912.x

    Articles: DFG German National Licenses
  4. 4
    YLI-MATTILA, T. ; PAAVANEN, S. ; HANNUKKALA, A. ; PARIKKA, P. ; TAHVONEN, R. ; KARJALAINEN, R.

    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Published 1996
    Staff View
    ISSN:
    1365-3059
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    Differences in isozyme and RAPD-PCR polymorphisms amongst 33 isolates of Fusarium avenaceum were compared using native polyacrylamide gel electrophoresis and agarose gel electrophoresis. The isolates were collected from different regions of Finland. Amongst eight enzymes analysed clear isozyme polymorphism was detected in five enzymes which could be grouped into 20 different electrophoretic phenotypes and three main groups at the similarity level of 70% in unweighted pair group method with arithmetic average (UPGMA) analysis. RAPD-PCR analysis differentiated all F. avenaceum strains from each other. The phenotypes resulting from RAPD-PCR analysis were grouped into five main groups by UPGMA analysis at the similarity level of 55%. These main groups had several similarities with the main groups from isozyme analysis. RAPD-PCR patterns of 16 isolates of Fusarium graminearumF. culmorumF. equisetiF. oxysporum and F. redolens were also studied and strains from each Fusarium species formed individual groups in UPGMA and principal components analyses. Thus, the extent of isozyme and RAPD-PCR polymorphisms found in Fusarium strains potentially provides a method for identifying the fungi both at strain and species level.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1046/j.1365-3059.1996.d01-105.x

    Articles: DFG German National Licenses
  5. 5
    LA PORTA, N. ; CAPRETTI, P. ; KAMMIOVIRTA, K. ; KARJALAINEN, R. ; KORHONEN, K.

    Oxford, UK : Blackwell Science Ltd
    Published 1997
    Staff View
    ISSN:
    1365-3059
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    Eighty-six Heterobasidion annosum isolates, mainly belonging to the F intersterility group and obtained from 32 different geographical localities in Italy, were subjected to genetic analysis by the Random Amplified Polymorphic DNA (RAPD) markers. The similarity between F and S groups was higher than that between F and P. In UPGMA Cluster Analysis, the F isolates originating from the same locality usually grouped in the same cluster. The isolates also showed a tendency to group at the level of larger geographical areas. Within the F group, isolates from the south of the Italian peninsula showed the highest genetic variation and northern isolates from the Alpine regions showed the lowest. This indicates a gradual cline along the peninsula. The genetic variability in the Italian F group is discussed in relation to the past and present distribution of the host species in Italy and Europe.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1046/j.1365-3059.1997.d01-65.x

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    0261-2194
    Keywords:
    Foliar-applied urea ; Septoria nodorum ; phytotoxicity ; protein quality ; spring wheat ; yield components
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0261-2194(91)90003-A

    Articles: DFG German National Licenses
  7. 7
    Jokinen, J. ; Karjalainen, R. ; Kulmala, A.
    Springer
    Published 1982
    Staff View
    ISSN:
    1573-2959
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00416699

    Articles: DFG German National Licenses