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  • 1
    ISSN: 1439-0329
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In a long-term study six Norway spruce (Picea abies) clones from two different provenance regions were exposed to 150/μg/m3 and 300μg/m3 ozone in open top chambers. Differential screening of subtractive cDNA libraries made from mRNA of ozone-treated trees identified several cDNA clones of ozone-responsive genes, two of which were studied in more detail. One cDNA clone corresponded to a porin-like mRNA, the other to a metallothionein-like mRNA. Under moderate ozone exposure the accumulation of these two mRNAs was already detectable before damage symptoms became visible. The spruce clones varied in the level of accumulation for the mRNAs. This is discussed under the aspect of ozone-induced early senescence rather than a defense reaction suppressing symptoms, because the two phenotypically most ozone-‘tolerant’ spruce clones showed the lowest levels of accumulation for both mRNAs.
    Type of Medium: Electronic Resource
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