INFLUENCE OF PHOTOSYNTHESIS-INHIBITING HERBICIDES ON OLIVE. I. EFFECTS ON CHLOROPLAST ACTIVITY AND STRUCTURE

E. Romera, R. de Prado, R. Garrido, M. Tena
Effects of ametryne, diuron, ioxynil, metribuzin and simazine on chloroplast activity and structure in leaves of 14-year-old olive trees (‘Picual’) have been studied. Photochemical O2 production and chlorophyll fluorescence emission, taken as indicative parameters of chloroplast activity, and chlorophyll a/b ratio and fatty acid composition of thylakoid lipids, taken as indicative parameters of chloroplast structure, were weekly analyzed in leaf samples during a 35-day period after treatment. The tested herbicides showed different translocation rates as well as intensity and persistence of their inhibitory effects. The above parameters varied between herbicides as follows: Translocation rate, ioxinil (I) > ametryne (A) > diuron (D) = metribuzin (M) > simazine (S); inhibitory activity, A = I = M > D > S and persistence of the inhibitory effect, M >> A > S > D > I. With respect to structural parameters a somewhat similar decrease in chlorophyll a/b ratio and increase in saturated/unsaturated fatty acid ratio was observed in all herbicide-treated samples.
Romera, E., de Prado, R., Garrido, R. and Tena, M. (1990). INFLUENCE OF PHOTOSYNTHESIS-INHIBITING HERBICIDES ON OLIVE. I. EFFECTS ON CHLOROPLAST ACTIVITY AND STRUCTURE. Acta Hortic. 286, 299-302
DOI: 10.17660/ActaHortic.1990.286.62
https://doi.org/10.17660/ActaHortic.1990.286.62

Acta Horticulturae