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Development and Growth Regulation

Gametic Differentiation of Chlamydomonas reinhardtii ¹

Control by Nitrogen and Light

Institut für Biologie III, Albert-Ludwigs-Universität, Schänzlestrae 1, D-7800 Freiburg, Federal Republic of Germany

Gametic differentiation of the unicellular green alga Chlamydomonas reinhardtii proceeds in two steps controlled by the extrinsic signals nitrogen deficiency and light. Nitrogen deprivation induces the differentiation of vegetative cells to sexually immature pregametes. A light signal is required to convert the pregametes to gametes. Both signals are also required for the maintenance of mating competence. Two converging signal transduction chains are proposed to control gamete formation. For the differentiation of pregametes to gametes, a fluence rate-dependent reaction, requiring continuous irradiation, is suggested by photobiological experiments.

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