Effects of Daylength on Endogenous Gibberellins in Solanum andigena III. Gibberellin Production by the Leaves

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Abstract
Using an agar diffusion technique, it was found that leaves from potato plants growing under long days produced more gibberellin‐like substances than did leaves from plants growing under short days. Short day plants irradiated with red light during the long dark period and harvested during the ensuing light period, contained levels of gibberellin‐like substances approximating those found in long day grown plants.Red irradiation during the long dark period also resulted in an increase in gibberellin production in short day plants. Four zones of gibberellin‐like activity (A, B, C, D) were separated by thin layer chromatography in extracts from potato leaves. Red light treatment reduced the levels of peak D and brought about a concomitant increase in the levels of peak A.