FLOWER FORMATION IN BEGONIA BOWERI IV. CYCLIC LIGHTING, REVERSIBILITY OF RED EFFECTS AND ‘END-OF-DAY-LIGHT’-EFFECTS

Fifteen or 30 min of red light during the 1st sensitive phase do not affect flowering, but added to the same 15 or 30 min of red during the 2nd sensitive phase, flowering is inhibited.
Cyclic lighting of 20 cycles ‘3 min red/5 min dark’ applied either during the 1st or during the 2nd sensitive phase prevent flowering.

Reversibility of the red effect by far-red could not be established very clearly, but 30 min of far-red following very short photoperiods of 1 or 2 h inhibited flowering.

Regulation of Growth and Endogenous Hormones, XXI IHC

K. Zimmer

https://doi.org/10.17660/ActaHortic.1983.134.12