Photosynthetic Properties of Green Barley Leaves after Treatment with Pyridazinone Herbicides—Comparison with the Effects of Diuron

摘要: Laskay, G. and Lehoczki, E. 1986. Photosynthetic properties of green barley leaves after treatment with pyridazinone herbicides -comparison the effects diuron.—J. exp. Bot. 37: 1558-1567. characteristics detached 72 h 0-2 mol m~3 SAN 6706, 9785 9789 were studied. For comparison, 001 diuron also investigated. Pyridazinone caused only a slight reduction total carotene content leaves. The chlorophyll content, as well linolenic to linoleic acid ratio chloroplast glycerolipids, however, remained unchanged. Diuron inhibition electron transport, revealed by fast fluorescence induction Hill reaction activity chloroplasts. 14C02-fixation light-induced quenching completely inhibited in vivo diuron. left 20-40% 14C02-flxation found control, spite fact that their tracings showed transport. Chloroplasts isolated from treated pyridazinones be highly active mediating ferricyanide-dependent reaction. In order test ability inhibit photosynthetic transport vivo, 'prompt' effect on was It is concluded can readily rapidly enter chloroplasts vivo. differences between long-term those suggest inhibitory effectiveness various parameters two herbicide groups. suggested leave during isolation owing loose binding onto thylakoid membranes. Key words—Pyridazinone herbicides, induction. Correspondence to: Department Biophysics, Jozsef Attila University, Egyetem u. 2, H-6722 Szeged, Hungary.