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Dose-Response Curves for Radish Seedling Phototropism

Marylee Everett
Plant Physiology
Vol. 54, No. 3 (Sep., 1974), pp. 222-225
Stable URL: http://www.jstor.org/stable/4263703
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Dose-Response Curves for Radish Seedling Phototropism
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Abstract

Radish seedlings (Raphanus sativus L.) were grown for 4 days in complete darkness, or in white light, or for 3 days in darkness followed by 1 day of red light. Phototropic dose-response curves for the seedlings grown in these three ways were determined with 460-nm light. The dark-grown and red lighttreated seedlings responded with positive curvatures of no more than 10° to energy doses in the first positive range and with larger positive curvatures in the second positive dose range. No indifferent or negative curvature was seen with the light intensity used. White light-grown seedlings did not respond to first positive energy doses, but responded as strongly to second positive doses as the other types of seedlings.

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