1982 Volume 17 Issue 4 Pages 279-287
As the relation between ozone concentration (C) and exposure time (T) which decides plant injury (I), in order to determine whether the relation of C2×T that we proposed on the previous studied is good or not, we exposed rice, soy bean, tobacco plants to the ozone in several conbinations of concentration-time which C2×T is constant. And we compared this relation with the relation of C×T that used commonly as Dose.
As a results, under the conditions of C2×T=constant, visible injury was nearly the same degree without mentioning and physiological injury such as ethylene evolution, chlorophyll decrease, MDA increase, K+ efflux was nearly the same degree. But under the conditions of C×T=constant, plant injury did not occurred the same degree, and plants exposed to higher ozone concentration occurred the injury more than low.
From these results, we recognized that the relation between plant injury and ozone concentration-exposure time was not linear but exponential relation, I=K (C2×T).
It is evident that the effect of photochemical oxidants on plants can be evaluated by the relation of C2×Tinstead of C×T.
