HIGHLIGHTS
SUMMARY
Tropospheric ozone (O3 ) is an oxidative pollutant harmful to plants. The PCA biplot contains the strength of VFI, physiology, and growth relationships, along with the species-specific sensitivity to drought and O3 stress. The O3 S vector shows the same direction as those of leaf parameters (number of leaves and leaf biomass ) in plants presenting more O3 VFI, which may indicate the promotion of carbon allocation to leaves as a compensation response against O3 injury. Opposite directions of the vectors were found for O3 VFI (O3 S) and net photosynthesis (Pn ), PNUE, and the . . .
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