A wider spectrum of avoidance and tolerance mechanisms explained ozone sensitivity of two white poplar ploidy levels.

Tolerance mechanisms of plants of both ploidy levels mainly focused on the enzymatic reduction of hydrogen peroxide through hydrogen peroxidase (CAT) and peroxidase (POD), yet those homeostatic regulatory mechanisms were higher in diploid plants. Our study recommends triploid white poplar as a bioenergy species only under short term O3 contamination. Under continuously elevated O3 over the long term, diploid white poplar may perform better.