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Plant and Cell Physiology, 1978, Vol. 19, No. 7 1253-1261
© 1978

Article

Mating type specific induction of cell wall lytic factor by agglutination of gametes in Chlamydomonas reinhardtii

Yoshihiro Matsuda, Shin-ichi Tamaki1 and Yoshihiro Tsubo2

1Department of Biology, Faculty of Sicence, Kobe University Kobe 657, Japan
2Department of Biology, School of General Education, Kobe University Kobe 657, Japan

When mt+ and mt– gametes of Chlamydomonas reinhardtii were mixed, shedding of cell walls took place in both mating types during massive agglutination and/or pairing. This was caused by a cell wall lytic factor that had been induced by flagellar agglutination and excreted into the medium by cells concurrently with their cell wall release.

When glutaraldehyde-fixed gametes and isolated flagella of one mating type caused isoagglutination of live gametes of the other mating type, the live mt+ gametes induced the lytic factor and shed their walls, whereas none of the live mt– did this. The cell walls of mt– gametes were lost only when the lytic factor, which had been excreted by mt+ gametes into the medium, acted from the outside. These data imply that mt+ gametes are responsible for the induction of the lytic factor by agglutination, which acts on cell walls of both mating types either endogenously or exogenously.

(Received February 28, 1978; )
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