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Plant and Cell Physiology, 1977, Vol. 18, No. 2 473-476
© 1977

Short communication

Second positive- and negative phototropism in Vaucheria geminata

Hironao Kataoka1

Department of Biology, Faculty of Science, Osaka University Toyonaka, Osaka 560, Japan

Second positive and negative phototropism are found in Vaucheria geminata when the light intensity is very high. The dose-response curve of this alga resembles those obtained with Avena coleoptiles, suggesting that the phototropism of both plants occurs through a common initial process.

1 Present address: Institute for Agricultural Research, Tohoku University, Sendai 980, Japan.

(Received October 13, 1976; )
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