Responses of normal and dwarf Pharbitis nil to an extended dark period and gibberellic acid

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The effects of a 24 hr short day, a 24 hr long day, and a 48 hr short day were analyzed with regard to flowering and stem growth of normal and dwarf Pharbitis nil, and were compared to effects of these photoperiodic treatments plus applied GA_3. Both short day treatments produced the same number of flowers per plant after seven cycles. The applied GA_3 was effective in overcoming the growth deficiency of the dwarf; however, the extended dark period of the 48 hr short day and applied GA_3 were both required to enhance a flowering response in the dwarf equal to that of the normal. These results indicate that some factor is present during the extended dark period which enhances flowering.
日本植物生理学会の論文