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Plant and Cell Physiology, 1962, Vol. 3, No. 1 67-82
© 1962

Article

STUDIES ON THE FORMATION AND SPROUTING OF AERIAL TUBERS IN BEGONIA EVANSIANA VII. PHOTO-SPROUTING OF TUBERIZING BUDS

YÔJI ESASHP1

Biological Institute, Faculty of Science, Tohoku University Sendai

1. In the process of aerial tuber formation in Begonia Evansiana ANDR. under short-days three stages are distinguished according to the sprouting ability of buds; namely, nycto-sprouting stage in which tubers can sprout without light, photo-sprouting stage in which light is required for sprouting, and thermo-sprouting stage in which chilling is required for sprouting.

2. There is no critical daylength for the photo-sprouting of isolated tubers, although, when attached to their mother plants, they sprout only under long-day conditions. This difference is ascribed to the failure of producing short-day stimulus in the tubers themselves.

3. For photo-sprouting higher temperatures are required than for the sprouting of chilled tubers at the thermo-sprouting stage.

4. Tubers at the photo-sprouting stage proceed further to the thermo-sprouting stage when kept in the dark, the process being affected by temperature.

5. The light function in photo-sprouting and the changes in sprouting ability of tubers in relation to the short-day stimulus are discussed.

6. An attempt is made to classify the plants according to their mode of requiring short-days for the cessation of their vegetative growth.

1 Present address: Institute for Agricultural Research, TÔhoku University, Sendai.

(Received September 16, 1961; )
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