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1995 (1)
1985 (1)
1979 (2)
1Author    H. K. KleudgenRequires cookie*
 Title    Veränderungen der Pigment-und Prenylchinongehalte in Chloroplasten von Gerstenkeimlingen nach Applikation des Wuchsstoffherbizids MCPA (4-Chlor-2-methylphenoxyessigsäure) Changes of the Amounts of Pigments and Prenylquinones in Chloroplasts of H ordeum vulgare — Seedlings Treated with the Growth Regulating Herbicide MCPA (4-Chloro-2-methylphenoxyacetic Acid)  
 Abstract    MCPA (4-chloro-2-methylphenoxyacetic acid) was applied (1, 10, 100 ^ m/ 1) via the roots to 4 day old etiolated barley seedlings, which were subjected to continuous white light at the same time. The prenyllipids of chloroplasts (chlorophylls, carotenoids, prenylquinones) were determined 7 and 10 days after sowing. Chlorophyll accumulation was reduced by up to 40% compared to the control depending on the herbicide concentration. The formation of carotenoids was inhibited to a lower degree, the ratio xanthophylls/carotenes being increased. There were decreasing ratios of chlorophyll a/benzoquinones and a higher inhibition of the oxidized benzoquinones plastoquinone-9 and a-tocoquinone compared to the reduced forms plastohydroquinone-9 and a-tocopherol. Very similar changes had been observed in earlier works on barley seedlings undergoing an artificial degeneration of their chloroplasts in the dark. It is suggested that MCPA induces a state of senescence in the prenyllipid metabolism of the photosynthetic apparatus, which is cor­ related with respect to structure, to a reduction of the pigment antennae. 
  Reference    Z. Naturforsch. 34c, 106 (1979); eingegangen am 13. November 1978 
  Published    1979 
  Keywords    Growth-Regulator, Prenyllipids, Chloroplasts, Senescence 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0106.pdf 
 Identifier    ZNC-1979-34c-0106 
 Volume    34 
2Author    BrunoW. Urzer, B. A. Sf, A. KtiengesellschaftRequires cookie*
 Title    Interpretation of Plant Growth Responses to Chemicals  
 Abstract    W hile searching for chem ical com pounds with herbicidal or growth regulating activities the researcher gladly notices if intact plants respond to the treatments at all. By means of colour slides, which unfortunately could not be printed here, changes in plant growth and leaf colour induced by chem icals were dem onstrated as they usually occur in an industrial screening operation. The range of sym ptom s shown in the presentation included sim ple lethal necrosis, "bleaching", increased generation of anthocyans, deterioration of the plant tissue, control of axillary buds, the prevention of resprouting, stunting of the shoots, and epinasties. Chem ical com pounds synthesised in the BA SF laboratories and com m ercial products were applied. 
  Reference    Z. Naturforsch. 34c, 931 (1979); received June 5 1979 
  Published    1979 
  Keywords    Plant Growth R esponse, H erbicides, Growth Regulators, Indicator Plants, Interactions 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0931.pdf 
 Identifier    ZNC-1979-34c-0931 
 Volume    34 
3Author    Jutta Bode, Aloysius WildRequires cookie*
 Title    Water Relations in Young Growing Wheat Leaves after Application of (2-Chloroethyl)trimethyl- ammoniumchloride (CCC) to the Roots of Wheat Seedlings  
 Abstract    The influence on the water relations of the third develo­ ping leaf of (2-chloroethyl)trimethylammoniumchloride, a synthetic growth regulator, applied to the roots of young wheat plants (Triticum aestivum L.) has been investigated. The tissue water potential and the pressure potential were found to be reduced by several bars in comparison to the untreated controls, whereas the osmotic potential re­ mained unchanged. The content of soluble reducing sugars was considerably increased in the cell sap of CCC-treated leaves. With this accumulation, however, the turgor was not maintained. Additionally, CCC-treated leaves showed considerably lower transpiration rates and higher diffusive resistance than the controls. Thus, the application of CCC to the roots causes alterations in the water relations of developing wheat leaves, which resemble those induced by water deficiency. 
  Reference    Z. Naturforsch. 40c, 745—747 (1985); received July 10 1985 
  Published    1985 
  Keywords    CCC, Growth Regulator, Triticum aestivum, Water Rela­ tions, Water Stress 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0745_n.pdf 
 Identifier    ZNC-1985-40c-0745_n 
 Volume    40 
4Author    JosephMungai Kerikoa, Shuhei Nakajim, Naomichi Babab, Yumika Isozakib, Kyoko Ikedab, Junkichi Iwasac, PaulNyota KaranjacRequires cookie*
 Title    A Plant Growth Regulator from Vemonia auriculifera (Asteraceae)  
 Abstract    From the methanolic extract of fresh leaves of the Kenyan Vemonia auriculifera Hiern.. a lettuce seeds growth regulator was isolated and identified as 8-des-acylvernodalol (1) by spectroscopic analysis. 
  Reference    Z. Naturforsch. 50c, 455—458 (1995); received January 3/February 13 1995 
  Published    1995 
  Keywords    Growth Regulator, Vemonia auriculifera, 8-Desacylvernodalol, Lettuce Seeds, Radicle Growth Promotion 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0455_n.pdf 
 Identifier    ZNC-1995-50c-0455_n 
 Volume    50