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Elevated CO 2 does not ameliorate effects of ozone on carbon allocation in Pinus halepensis and Betula pendula in symbiosis with Paxillus involutus
Author(s) -
Kytöviita M.M.,
Pelloux J.,
Fontaine V.,
Botton B.,
Dizengremel P.
Publication year - 1999
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.1999.106403.x
Subject(s) - betula pendula , paxillus involutus , ozone , botany , ectomycorrhiza , rubisco , chemistry , horticulture , mycorrhiza , symbiosis , biology , photosynthesis , genetics , organic chemistry , bacteria
The effect of 700 μmol CO 2 mol −1 , 200 nmol ozone mol −1 and a combination of the two on carbon allocation was examined in Pinus halepensis co‐cultured with Betula pendula in symbiosis with the ectomycorrhizal fungus Paxillus involutus . The results show that under low nutrient and ozone levels, elevated CO 2 has no effect on the growth of B. pendula or P. halepensis seedlings nor on net carbon partitioning between plant parts. Elevated CO 2 did not enhance the growth of the fungus in symbiosis with the birch. On the other hand, ozone had a strong negative effect on the growth of the birch, which corresponded with the significantly reduced growth rates of the fungus. Exposure to elevated CO 2 did not ameliorate the negative effects of ozone on birch; in contrast, it acted as an additional stress factor. Neither ozone nor CO 2 had significant effects on biomass accumulation in the pine seedlings. Ozone stimulated the spread of mycorrhizal infection from the birch seedlings to neighbouring pines and had no statistically significant effects on phosphoenolpyruvate carboxylase (PEPC) or ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) activity in the pine needles or on PEPC activity in pine roots.