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'Transformation' in keywords Facet   Publication Year 1991  [X]
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1Author    J. Berlinab, C. Rügenhagena, M. Rippert, S. ErdoganRequires cookie*
 Title    Effects of Culture Conditions on Isoflavonoid Levels of Transformed and Non-Transformed Cultures of Lupinus -a Comparison of Suspension and Hairy Root Cultures  
 Abstract    Some highly productive suspension and hairy root cultures were found among several trans­ formed cultures o f Lupinus polyphyllus and L. hartwegii. A transformed suspension culture Lupo 30150 and a root culture Luha 15834 containing the highest specific isoflavone glucoside content were characterized and compared with normal phytohormone-dependent lines with respect to product stability as well as to their responsiveness to external triggers, e.g. response to changes in the medium. While phytohorm one-dependent suspension cultures lost their ini­ tial ability to form increased levels o f isoflavonoids on phytohormone-free medium, the trans­ formed phytohorm one-independent suspension Lupo 30150 remained a highly productive line, despite the fact that its specific levels decreased to 60% o f the initial values during several years in liquid medium. Highest stability o f product patterns and levels were noted for the transformed root culture. Phytohorm ones had little effect on growth and isoflavonoid levels in suspension cultures, while they reduced both strongly in root cultures. In the presence o f 2,4-D the root culture changed into an aggregated low producing suspension culture from which the root state was recovered on phytohorm one-free medium. As long as the root state was main­ tained, isoflavonoid levels could not be distinctly improved by media variation while specific isoflavonoid levels o f suspensions were increased by stress factors such as phosphate depletion. When suspensions were transferred to fresh medium phenylalanine ammonia-lyase was greatly induced within 24 h, while the activity remained nearly unchanged in root cultures. 
  Reference    Z. Naturforsch. 46c, 735—7 (1991); received April 23 1991 
  Published    1991 
  Keywords    Lupinuspolyphyllus, Lupinus hartwegii, Transformation, Hairy R oot Cultures, Isoflavonoids 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0735.pdf 
 Identifier    ZNC-1991-46c-0735 
 Volume    46 
2Author    H. Schäfer, K. Taraz, H. BudzikiewiczRequires cookie*
 Title    Zur Genese der amidisch an den Chromophor von Pyoverdinen gebundenen Dicarbonsäuren |1] On the Genesis of the Dicarboxylic Acids Bound Amidically to the C hrom ophor of the Pyoverdins [1]  
 Abstract    Pseudomonas strains o f the so-called fluorescent group usually produce several pyoverdins which differ only in the nature o f a dicarboxylic acid bound amidically to the chromophor. For the pyoverdins isolated from the culture medium o f Pseudomonas fluorescens 12 it is shown that succinic acid is an artefact formed by hydrolysis o f succinic amide, and that a-ketoglutaric acid is transformed enzymatically to glutamic acid. This process is reversed after the phase o f exponential growth o f the bacteria. The ratio C4-vs. C 5-acids changes with the culture time and with increasing Fe3+ content o f the medium in favor o f the latter. 
  Reference    Z. Naturforsch. 46c, 398 (1991); received December 21 1990/March 13 1991 
  Published    1991 
  Keywords    *Pyoverdins, Biogenesis, Transformations, Citric Acid Cycle, Pseudomonas fluorescens 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0398.pdf 
 Identifier    ZNC-1991-46c-0398 
 Volume    46