“…In this situation there are many ways in which ozone and water deficit might interact. Heggestad et al (1985) provided evidence that ozone reduces tolerance to soil moisture deficit, but many papers on crops report little or no ozone-water deficit interaction Miller et al, 1988 ;Heagle et al, 1989 ;Temple, 1990 ;Fangmeier et al, 1994), whilst some show that water deficit reduces the effects of ozone. There are, for example, reports of reduced visible injury (Pell et al, 1993 ;Vandermieren et al, 1995), lower ozoneinduced stress ethylene production (Tingey et al, 1982), reduced effects on net photosynthesis Vozzo et al, 1995), reduced water consumption (Kobayashi et al, 1993) and alleviation of effects on yield (Temple, Taylor & Benoit, 1985 ;Heagle et al, 1987 ;Moser et al, 1988 ;.…”