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Plant and Cell Physiology, 1979, Vol. 20, No. 8 1671-1673
© 1979

Short communication

Responses of normal and dwarf Pharbitis nil to an extended dark period and gibberellic acid1

Harold A. Simmons2 and Murray W. Coulter

Department of Biological Sciences, Texas Tech University Lubbock, TX 79409, U.S.A.

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 GA3. Both short day treatments produced the same number of flowers per plant after seven cycles. The applied GA3 was effective in overcoming the growth deficiency of the dwarf; however, the extended dark period of the 48 hr short day and applied GA3 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.

1 This work was supported by NSF Grant GB-7510 and State supported research TTU-191-4771 to M. W. C.

2 Present address: Department of Biology, Union University, Jackson, TN 38301, U.S.A.

(Received September 4, 1979; )
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