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Effets physiologiques de fortes teneurs d'ozone et de CO2 seul et en combinaison, chez des semis d'érable à sucre (Acer saccharum Marsh.)

Abstract : Experiments in OTC and phytotronic chambers were conducted during one growing season to study the effects of high CO2 and O3 on regeneration of sugar maple seedlings. Assimilation rate and growth of seedlings were decreased after an exposure at constant O3 (100 to 300 nL.L[exponent -1]). Stimulation of GR, G6PDH, PEPC and NR activities allowed an increased availability of reducing power, carbon skeletons and nitrogen necessary for the detoxification and repair mechanisms. Under 650 [mu]L.L[exponent -1] CO2, increase of growth (10 to 100%) depends of nutrient and light availability of the experiment. Under high CO2 + O3, growth and stimulation of G6PDH, PEPC and NR were intermediary to these of the seedlings exposed under high O3 and those exposed under high CO2. Under high CO2, assimilation rate was stimulated. This allowed an increased synthesis of NADPH and carbons skeletons, which may be allocated to detoxification and repair mechanisms and, thus, contributed to reduce the propagation of oxidative damages.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2001_0182_GAUCHER.pdf
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Submitted on : Thursday, March 29, 2018 - 10:40:29 AM
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Catherine Gaucher. Effets physiologiques de fortes teneurs d'ozone et de CO2 seul et en combinaison, chez des semis d'érable à sucre (Acer saccharum Marsh.). Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10182⟩. ⟨tel-01746570⟩

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