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Inhibition of photosynthesis of Populus euramericana and Helianthus annuus by SO 2 , NO 2 and O 3
Author(s) -
Furukawa Akio
Publication year - 1991
Publication title -
ecological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.628
H-Index - 68
eISSN - 1440-1703
pISSN - 0912-3814
DOI - 10.1007/bf02353871
Subject(s) - photosynthesis , helianthus annuus , photosynthetically active radiation , botany , pollutant , biology , chemistry , horticulture , sunflower , ecology
Populus euramericana cv. I‐214 and Helianthus annuus L. cv. Russian Mammoth were exposed to various concentrations of O 3 SO 2 or NO 2 for 2 h in a cylindrical assimilation chamber. The threshold concentrations of air pollutants for inhibition of net photosynthesis differed between the two species and also between the pollutants tested. Furthermore, the lethal concentrations where the net photosynthetic rates were completely inhibited, also differed between species and between pollutants. For SO 2 and NO 2 , P. euramericana was more tolerant photosynthetically than H. annuus when related to the concentration of pollutants used during the experiment. However, when related to the cumulative uptake rate of each pollutant, the photosynthetic tolerance of the two species was similar. In contrast to the effects of SO 2 or NO 2 , the influence of O 3 on net photosynthesis was quite different. The relative rates of net photosynthesis in both species showed the same linear relationship with O 3 concentration. However, the relationship between the relative rate of net photosynthesis and the cumulative uptake rate of O 3 differed between the two species, although it was linear in both cases.