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Antagonistic effects of simultaneous exposure to sulphur dioxide gas and vapour of the herbicide 2, 4‐D iso ‐octyl on the carbon dioxide exchange of tomato and field bean plants
Author(s) -
BREEZE VICTOR G.,
FOWLER ALISON T.
Publication year - 1992
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1992.tb01079.x
Subject(s) - carbon dioxide , transpiration , chemistry , vapour pressure deficit , stomatal conductance , water vapor , horticulture , vapor pressure , photosynthesis , agronomy , botany , biology , biochemistry , organic chemistry
summary Tomato and field bean plants were exposed simultaneously to SO 2 gas (in the range 0.07–0.57 μg 1 −1 ) and to vapour of the herbicide [ 14 C]2, 4‐D iso‐octyl (0.8–2.7 ng 1 −1 ), for periods of 6–24 h in an air‐flow system at a water vapour pressure deficit of >2 kPa. Greater response was shown by the plants to 2, 4‐D vapour than to SO 2 . Herbicide vapour alone decreased CO 2 exchange during the 3 d experimental period in both species, but the combination of herbicide plus SO 2 had less effect. The response by tomato was both greater and more rapid than by field bean (which showed an initial stimulation of CO 2 exchange due to 2, 4‐D), and the two species differed in the effect on transpiration. SO 2 did not affect the uptake and distribution of herbicide within the plants. It appeared that 2, 4‐D iso‐octyl vapour and SO 2 were antagonistic in effect on the CO 2 exchange of the two species under the experimental conditions, and that in tomato this was largely due to changes in stomatal conductance.