Ultrastructure changes in grapevine chloroplasts caused by increased tropospheric ozone concentrations
2001
Britvec, M. | Pecina, M. (University of Zagreb, (Zagreb (Croatia)) | Reichenauer, T. | Soja, G. | Ljubesic, N. | Eid, M.
The ultrastructure of chloroplasts in the leaves of grapevine plants (Vitis vinifera L.) exposed to different ozone concentrations was investigated. Ozone fumigations were performed in open-top chambers at four different ozone levels (charcoal-filtered air (F), ambient air (N), ambient air + 25 cubic mm/m ozone (O-25) and ambient air + 50 cubic mm/m ozone (O-50). Under slightly elevated ozone concentrations chloroplasts showed an increase in number and size of plastoglobuli. The thylakoid system appeared to be relatively well preserved even under elevated ozone concentration (O-25). The O-50 leaves showed a decrease in the content of chlorophyll a + b and in the ratio chl a + b/carotenoids as well as disintegration of some chloroplasts, while others - sometimes within the same cell - appeared still intact
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