Journal Article

Control of Gametic Differentiation and Activity by Light in <i>Chlamydomonas reinhardtii</i>

Tatsuaki Saito, Michiyo Inoue, Miyuki Yamada and Yoshihiro Matsuda

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 1, pages 8-15
Published in print January 1998 | ISSN: 0032-0781
Published online January 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029292
Control of Gametic Differentiation and Activity by Light in Chlamydomonas reinhardtii

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Laboratory strains of Chlamydomonas reinhardtii, which are descendants of a 1945 isolate by G.M. Smith (Harris 1989), were divided into two groups depending upon whether the vegetative cells require light to differentiate into gametes under ammonium ion-starved conditions. Light-dependent (LD) strains were unable to become gametes in the dark, while light-independent (LI) strains could do so. All the wild-type strains isolated recently from the field showed light-dependency, suggesting that the LD-phenotype is the wild-type. The LD-cells failed to acquire flagellar agglutinability, to accumulate cell body agglutinins, or to form mating structures in the dark, but did so rapidly after transfer to light. Moreover, the light-induced LD-gametes, but not the Li-gametes, lost their mating ability, cell body agglutinins, and mating structures after transfer to darkness, indicating that the LD-cells require light not only for gametic differentiation but also for maintenance of gametic activity.

Keywords: Chlamydomonas reinhardtii; Gametogenesis; Light requirement/non-requirement; Wild-type strains

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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