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Effects of low‐level ozone exposure under ambient conditions on photosynthesis and stomatal control of Vicia faba L.
Author(s) -
ABEN J. M. M.,
JANSSENJURKOVIČOVÁ M.,
ADEMA E. H.
Publication year - 1990
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1990.tb01323.x
Subject(s) - photosynthesis , vicia faba , stomatal conductance , respiration , ozone , horticulture , botany , respiration rate , chemistry , stomatal density , biology , organic chemistry
. Gas exchange rates of 4‐week‐old faba bean plants were measured after exposure to ozonc (120 μg m 3 ) in an open top chamber for 8 h per day over a period of 2 weeks. The exchange rates were compared with those of control plants. Plants exposed between mid‐May and the end of July 1987 showed a minor negative effect on stomatal conductance, while there was no effect on photosynthesis and respiration. Plants exposed between the end of August and early October showed a negative effect on both stomatal conductance and photosynthesis. In addition, the dark respiration rate was slightly increased. It is concluded that ozone can have a direct effect on the stomata as well as on the photosynthetic system and that the stomata are more sensitive than the photosynthetic system.