Photoinhibition and oxidative stress: effects on xanthophyll cycle, scavenger enzymes and abscisic acid content in tobacco plants

aba colorant colorantes dyes enzimas enzyme enzymes estres fitotoxicidad growth inhibitors herbicidas herbicide herbicides inhibidores del crecimiento inhibiteur de croissance nicotiana tabacum ozone ozono paracuat paraquat phytotoxicity pigment pigmentos pigments plant growth substances stress sustancias de crecimiento vegetal xanthophylle xanthophylls xantofilas