Carbon dioxide enrichment reduces shoot growth in sweet chestnut seedlings (Castanea sativa Mill.)*

Authors

  • M. MOUSSEAU,

    Corresponding author
    1. Ecologie Végétale, Bât. 362, Université de Paris-Sud, Centre d'Orsay, 91405 Orsay Cedex, France
      M. Mousseau, Ecologie Végétale, Bât. 362, Université de Paris-Sud, Centre d'Orsay, 91405 Orsay Cedex, France.
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  • H. Z. ENOCH

    1. Department of Agricultural Meteorology, Agricultural Research Organization, The Volcani Center, Institute of Soils and Water, Bet Dagan, Israel
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  • *

    The work was carried out in Ecologie Végétale, Université de Paris-Sud, Centre d'Orsay, France.

M. Mousseau, Ecologie Végétale, Bât. 362, Université de Paris-Sud, Centre d'Orsay, 91405 Orsay Cedex, France.

Abstract

Abstract. Two-year-old potted sweet chestnut seedlings were grown at 350 ppm CO2 and 700 ppm, day and night in constantly ventilated tunnels during two full growing seasons, near Paris, France (48° N, 2° E). Enrichment with CO2 caused an unusual shoot growth response. After the end of July, stem elongation ceased in 62% of the CO2 enriched plants as compared with 37% in the control. The leaves of CO2-enriched seedlings showed early senescence, indicated by premature yellowing and a decrease in chlorophyll content. This was associated with nutrient dilution brought about by the rapid growth of these trees. The increase in total dry weight of the CO2-enriched seedlings was essentially the result of increase in the root dry weight (69%). Shoot weight decreased by 22% relative to the control. Total leaf area per enriched plant was 25% smaller than the control. This unusual pattern of growth and carbon allocation of the CO2 treated Chestnut trees emphasizes the concept of a response specificity within trees to an increase of atmospheric CO2.

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