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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 27 (2004), S. 0 
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The hypothesis that plants grown under elevated CO2 allocate more carbon to the production of latex and C-rich secondary compounds whereas nutrient addition counteracts this effect was tested. Two similar experiments were conducted in two different experimental facilities. In both facilities seedlings of Euphorbia lathyris were exposed to factorial combinations of two CO2 concentrations and two levels of nutrient availability for 2 months. The CO2 treatments and growth conditions differed substantially between these two experiments but treatment responses to elevated CO2 and fertilizer addition were remarkably similar, underlining the robustness of our findings. Elevated CO2 increased biomass to a greater extent in fertilized than in unfertilized  plants  and  reduced  the  leaf  biomass  fraction by accelerating leaf senescence. Concentrations of non-structural carbohydrates (NSC) increased in elevated CO2. However, this apparent carbon surplus did not feed into the whole plant latex pool. The latex harvest per leaf (−25%) and the concentration of latex-related hydrocarbons (−20%) even decreased under elevated CO2 (both experiments P 〈 0.05). Fertilization reduced NSC concentrations (−25%) but neither affected latex yield per leaf nor the concentration of latex-related hydrocarbons. It is concluded that latex and related hydrocarbons in CO2-enriched plants are a negligible sink for excess carbon irrespective of nutrient status and thus, vigour of growth.
    Type of Medium: Electronic Resource
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