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Plant and Cell Physiology, 1978, Vol. 19, No. 2 245-252
© 1978

Article

Light dependency of the mating process in Closterium acerosum

Takehiko Ueno and Kimiko Sasaki

Department of Botany, Faculty of Science, Hokkaido University Sapporo, Japan

Sexual cell division and activation of gametangial cells for conjugation in Closterium acerosum were induced by light. L200 cells conjugated at maximum level under the following conditions; (i) a light intensity higher than 1,000 lux in a 16-hr light and 8-hr dark regime and (ii) an illumination time longer than 12 hr at 3,000 lux. L200 cells also conjugated under continuous illumination at 3,000 lux.

The action spectrum for the activation of gametangial cells had peaks around 450, 611 and 665 nm.

3-(4'-Chlorophenyl)-l,l-dimethylurea (CMU) inhibited the accumulation of carbohydrates and sexual cell division at 10–5 M and the activation of gametangial cells for conjugation at 10–4 M.

(Received August 15, 1977; )
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