[en] Phalaenopsis plants flowered 3 1/4 months after passing from a 24/22 °C day/night to a 22/17°C regime without changing the photoperiod (12:12). The new thermoperiodic treatment induced rapid IAA fluctuations (with a significant peaking between day 2 and day 5), and about the same fluctuation for putrescine. Since flowering occurred much later and because quite similar results were observed during plant cold acclimation, the relationships of the biochemical changes registered with flowering induction were questioned.
