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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