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1984 (2)
1Author    Bernd Weisshaar, Rainer Gilles, Regina Moka, Lothar JaenickeRequires cookie*
 Title    A High Frequency Mutation Starts Sexual Reproduction in Volvox carteri  
 Abstract    Pheromone-initiated sexual reproduction of Volvox carteri f. nagariensis is started by a "spontaneous" generation of sexual male spheroids at a rate of 10~4. As previously suggested, these males are mutants (5e.vc) which become independent of pheromone-controlled sex-induction. Unequivocal evidence for a mutative event now comes from the observation that the sex0 trait is transmitted through cell lineages during embryogenesis, thus confirming earlier 
  Reference    Z. Naturforsch. 39c, 1159—1162 (1984); received July 6 1984 
  Published    1984 
  Keywords    Cell Lineages, Mutation, Sexual Induction, Volvox carteri 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-1159.pdf 
 Identifier    ZNC-1984-39c-1159 
 Volume    39 
2Author    Rainer Gilles, Claudia Gilles, Lothar JaenickeRequires cookie*
 Title    Pheromone-Binding and Matrix-Mediated Events in Sexual Induction of Volvox carteri  
 Abstract    Sexual differentiation o f the reproductive cells (gonidia) o f the green alga Volvox carteri f. nagariensis Iyengar is triggered by a glycoprotein inducer which is released into the medium by sexual male spheroids. If added, it induces the next generation cycle to becom e sexual. About 3000 pheromone molecules per spheroid will give full induction. Specific binding sites for the pheromone have been identified in the extracellular matrix in which characteristic events take place. Inducer binding and action are reversible for a certain tim e period until the start o f cell division; thereafter, determination o f the gonidia is final. Extent o f sexual induction is proportional to the duration o f inducer pulses. Inhibition o f sexual induction reveals as essential extracellular components o f the induction system high m olecular acidic glycoproteins, cyclic nucleotides, Ca2+/calm odulin, and pherom one-controlled gene products. Low matrix levels o f cyclic AMP and cyclic GMP seem to stim ulate induction; high levels to inhibit. 
  Reference    Z. Naturforsch. 39c, 584 (1984); received March 7. 1984 
  Published    1984 
  Keywords    Volvox carteri, Sexual Induction, Extracellular Matrix, Pherom one, Cyclic N ucleotides 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0584.pdf 
 Identifier    ZNC-1984-39c-0584 
 Volume    39