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Plant and Cell Physiology, 1961, Vol. 2, No. 1 77-86
© 1961

Article

SUCCESSIVE PROCESSES INVOLVED IN THE GERMINATION RESPONSE OF NASTURTIUM SEEDS

TADASHI FUJII and SIGEO ISIKAWA

Botanical Institute, Faculty of Science, Tokyo University of Education Tokyo

1. The seeds ofNasturtium palustreDC. do not germinate, either in the light or darkness, at various constant temperatures, but require for their full germination a certain period of a low temperature (5°) applied immediately after light irradiation. These results indicate the existance of at least two processes, a light-dependent process and a low temperature-requiring process, in the initiation of germination ofNasturtiumseeds. Experimental evidence indicated further that the light exposure causes two different processes in the seed germination.

2. When a dark period at 23° was inserted between the light irradiation and the low temperature treatment the germination was suppressed. The inhibitory effect of the inserted dark period at 23° was eliminated by a short irradiation during the darkness (light-break).

3. Prolonged exposure ofNasturtium seeds to any concentration of gibberellin brought about no germination when exposure was given in complete darkness. The germination was promoted only when light irradiation was applied to the seeds. A short application of gibberellin at a fairly high concentration was, however, remarkably effective for the germination even in the darkness, and the germination was inhibited as the gibberellin application was lengthened. It was considered that gibberellin could substitute for the combined effect of light irradiation and low temperature treatment to induce the germination of Nasturtium seeds, and that gibberellin was inhibitive toward the reactions following the above treatments which induced the germination

(Received October 31, 1996; )
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