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1992 (1)
1984 (1)
1Author    ArminR. Gemmrich, Hartmut KayserRequires cookie*
 Title    Hormone Induced Changes in Carotenoid Composition in Ricinus Cell Cultures. II. Accumulation of Rhodoxanthin during Auxin-Controlled Chromoplast Differentiation  
 Abstract    The effects of auxin and cytokinin on light dependent carotenoid synthesis were studied in callus cultures derived from Ricinus endosperm tissue. Chloroplasts differentiate when calli are grown in the light in the presence of cytokinin and auxin. When cultures are transferred to an auxin-free medium, chromoplast differentiation is initiated, i.e. rhodoxanthin accumulates whereas lutein and chlorophyll content decrease and the plastid morphology changes from that of a typical chloroplast to that of a globular-type chromoplast. These changes are fully reverted by readdition of auxin. Plastid differentiation into either chloroplasts or chromoplasts in Ricinus endosperm cultures therefore appears to be controlled by auxin and cytokinin. 
  Reference    Z. Naturforsch. 39c, 753—757 (1984); received May 11 1984 
  Published    1984 
  Keywords    Plant Cell Cultures, Cytokinin, Auxin, Plastid Differentiation, Carotenoids 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0753.pdf 
 Identifier    ZNC-1984-39c-0753 
 Volume    39 
2Author    Hiroshi Hirano, M. Asaaki Sakuta, Atsushi Kom, Am IneRequires cookie*
 Title    Inhibition by Cytokinin of the Accumulation of Betacyanin in Suspension Cultures of Phytolacca americana  
 Abstract    The accumulation o f betacyanin was reduced by the addition o f various cytokinins to sus­ pension cultures o f Phytolacca americana. The decrease in the accumulation o f betacyanin was overcome by exogenously supplied tyrosine which is a precursor o f betacyanin. Benzylamino-purine (BAP) decreased the level o f free tyrosine in the cells. Feeding experiments using labeled tyrosine revealed that BAP reduced the incorporation o f labeled tyrosine into betacyanins (to about 50% o f the control rate). These results suggest that both the availability o f tyrosine and the biosynthetic activity o f the pathway from tyrosine to the betacyanins are involved in the inhibition o f the accumulation o f betacyanins by cytokinins in P hytolacca americana cells. 
  Reference    Z. Naturforsch. 47c, 705 (1992); received June 29/A ugust 17 1992 
  Published    1992 
  Keywords    Betacyanin, Cytokinin, Phytolacca americana, Suspension Culture, Tyrosine 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0705.pdf 
 Identifier    ZNC-1992-47c-0705 
 Volume    47