Abstract
Man’s influence on the ‘greenhouse effect,’ the heating of the atmosphere due to increasing concentra tions of tropospheric trace gases, is of much international concern. Among the climatic variables, elevated levels of carbon dioxide (CO2), ultraviolet-B (UV-B) radiation and ozone (O3) are known to have a direct effect on vegetation. Our current knowledge of these effects is mainly based on studies involving single stress mode. Thus, the joint effects of CO2, UV-B and O3 on vegetation are poorly understood. Nevertheless, based on the literature analysis of plant response to individual stress factors, it can be concluded that sorghum, pea, bean, potato, oat, lettuce, cucumber, rice and tomato are among the crop species potentially sensitive to the joint effects of the aforementioned three variables. Similar information for tree species is essentially lacking.
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