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1984 (1)
1Author    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