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1982 (1)
1979 (1)
1Author    H. K. KleudgenRequires cookie*
 Title    Die Wirkung von Simazin auf die Bildung der plastidären Prenyllipide in Keimlingen von Hordeum vulgare L. Effect of Simazine on Formation of Chloroplasts Prenyllipids in Seedlings of H ordeum vulgare L  
 Abstract    Barley seedlings were grown for 7, 10 or 13 days under continuous white light (Fluora lamps) on a nutrient solution containing simazine (2-chloro-4,6-bis-(ethylamino)-s-triazine, 10, 100 j u m) . Accumulation of chlorophylls and in part of carotenoids was increasingly enhanced depending on age and concentrations applied. The ratio chlorophyll a/b decreased on this line in 10 and 13 day old plants, the ratio xanthophylls//?-carotene and the ratio chlorophyll a/prenylquinones (plasto-quinone-90x. + red. , a-tocopherol, a-tocoquinone) increased. The way how these prenyllipid ratios are changed in 10 and 13 day old plants is characteristic of a shade type adaptation, as it was shown earlier for other herbicides inhibiting photosystem II. In 7 day old plants the ratio chlorophyll a/prenylquinones decreased. Photosynthetic activity (Hill-reaction) was enhanced in the simazine plants. The ratio chlorophyll a/b was higher, the ratio xanthophylls//?-carotene was lower than in the older seedlings. Similar changes of prenyllipid ratios like in 7 day seedlings and a higher Hill activity were also found in plants grown under blue light (sun type adaptation) as compared to red light (shade type adaptation). This points to similar metabolic changes in the chloroplasts which could be related to a common site of regulation, perhaps the endogenuous cytokinins. The Hill activity, increasing with age in the 10 and 13 day plants, indicates that the mode of action of simazine may be a multiple process resulting to a parallel formation of shade type and sun type characteristics. 
  Reference    Z. Naturforsch. 34c, 110 (1979); eingegangen am 13. November 1978 
  Published    1979 
  Keywords    Herbicide, Simazine, Prenyllipids, Chloroplasts, Regulation 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0110.pdf 
 Identifier    ZNC-1979-34c-0110 
 Volume    34 
2Author    R. Blaich, O. Bachmann, Iris BaumbergerRequires cookie*
 Title    Studies of Photosynthesis Inhibition by Phytoluminography  
 Abstract    Inhibition of photosynthesis by simazine or diuron, as well as disturbance brought about by darkness, fungal infections, heat, high concentrations or lack o f C 0 2, lead to a luminescence of chloroplasts after irradiation with photosynthetically active light. This effect is the basis of phytoluminography, a new method which may replace in many cases the tedious procedures used at present to determine the photosynthetic capacity o f living plant tissue. Both qualitative analyses of luminescence images produced by an image intensifier as well as quantitative measurements using a photomultiplier are possible. Autoradiographic studies have shown that luminescence images of herbicide-damaged leaves are identical with autoradiographs of the same leaf obtained after labelling with radioactive C 0 2. In contrast to autoradiography, phytoluminography does not damage the tested parts of plants nor is there danger o f contamination. There is no need for expensive chemicals and skilled technicans, and immediate results are obtained. Quantitative measurements o f phytoluminescence after the application o f simazine and diuron (DCMU) to Elodea canadensis in submersed culture showed that approximately 1 M of inhibitor per 20 m of chlorophyll (a + b) is needed to obtain maximal luminescence, which indicated total inhibition of photosynthesis. Both luminescence and inhibition are reversible if the inhibitor is removed by dialysis. 
  Reference    Z. Naturforsch. 37c, 452 (1982); received January 18 1982 
  Published    1982 
  Keywords    Chlorophyll Luminescence, Photosynthesis Inhibition, Simazine, Phytoluminography 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0452.pdf 
 Identifier    ZNC-1982-37c-0452 
 Volume    37