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'Pyridazinone Herbicides' in keywords
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1988 (1)
1983 (1)
1Author    G. E. Laskay, I. M. Lehoczki, L. Aróti, SzalayRequires cookie*
 Title    Effects of Pyridazinone Herbicides during Chloroplast Development in Detached Barley Leaves I. Effects on Pigment Accumulation and Fluorescence Properties  
 Abstract    The effects o f three differently substituted pyridazinone herbicides on the accum ulation o f photosynthetic pigments and on the fluorescence properties o f greening barley leaves were studied. The two trifluoro-methyl derivatives, SAN 6706 and 9789 caused inhibition in the accumulation o f carotenes only after the First 24 h o f greening. By the 48th hour o f greening no detectable amounts o f carotenes were present in the treated leaves. Considerable am ounts o f xanthophylls however remained present, and no bleaching o f the leaves was observed. It is suggested that SAN 6706 and 9789 prevent the formation o f the enzym e(s) catalyzing the desaturation o f phytoene and phytofluene. Fluorescence spectra indicate that the organization o f pigment forms altered seriously in the treated leaves. This experimental system may be useful to study the action o f pyridazinone herbicides without causing com plete photobleaching o f the photosynthetic apparatus. SAN 9785 had only minor effects on pigment accum ulation and also on the organization o f pigment forms. The possible explanations o f the effects observed are dis­ cussed. 
  Reference    Z. Naturforsch. 38c, 736—740 (1983); received June 8 1983 
  Published    1983 
  Keywords    Pyridazinone Herbicides, Carotenoids, Fluorescence Spectrum 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0736.pdf 
 Identifier    ZNC-1983-38c-0736 
 Volume    38 
2Author    A. Hloušek-Radojčič, N. LjubešičRequires cookie*
 Title    The Development of Daffodil Chromoplasts in the Presence of Herbicides SAN 9789 and SAN 9785  
 Abstract    The effects of two pyridazinone herbicides (SAN 9789 and SAN 9785) were studied on the fine structure and carotenoid composition during the transformation of chloroplasts into chromoplasts in daffodil (Narcissus poëticus L.) flowers. SAN 9789 caused the absence of big characteristic carotene crystals and the appearance of numerous nonosmiophilic plastoglobuli in chromoplasts. The accumulation of all carotenoids was drastically reduced and the content of carotenes was 40-fold lower than in the control. SAN 9785 caused no gross abnormalities in ultrastructure of chromoplasts. The synthesis of carotenes was partially reduced to about 75%. In spite of this the accumulation of xanthophylls is two times higher than in the control. The interaction between chromoplast ultrastructure and carotenoid composition is discussed. 
  Reference    Z. Naturforsch. 43c, 418—422 (1988); received December 7 1987/January 26 1988 
  Published    1988 
  Keywords    Pyridazinone Herbicides, Chromoplast Ultrastructures, Carotenoids 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0418.pdf 
 Identifier    ZNC-1988-43c-0418 
 Volume    43