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Plant and Cell Physiology, 1993, Vol. 34, No. 7 991-996
© 1993

Detection and Evaluation of an Inducer of a Diffusible Mating Pheromone of the Heterothallic Closterium peracerosum-strigosum-littorale Complex

Hiroyuki Sekimoto, Yutaka Inoki and Tadashi Fujii

Institute of Biological Sciences, University of Tsukuba Tsukuba, Ibaraki, 305 Japan

When mating-type plus cells of the Closterium peracerosum-strigosum-littorale complex were incubated in nitrogen-deficient medium obtained from a 24-h-old mixed culture of mating-type plus and mating-type minus cells, protoplast-release-inducing activity specific for mating-type minus cells was detected in the medium. When mating-type plus cells were incubated in the medium from a culture of exclusively mating-type minus cells, protoplast-release-inducing activity was also detected. These results suggested the existence of a substance, released from mating-type minus cells, that has the ability to make mating-type plus cells release protoplast-release-inducing protein (PR-IP). We designated it PR-IP Inducer. The PR-IP Inducer was constitutively released from mt– cells in the light. The PR-IP Inducer was heat-labile and had a relative molecular weight of 10,000 on gel filtration. We suggest that the PR-IP Inducer is also a pheromonal substance that plays a role in the initial events in the sexual communication of this Closterium complex.

(Received April 26, 1993; Accepted July 15, 1993)
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