EFFECTS OF LOW TEMPERATURES AND GIBBERELLIC ACID ON FLOWERING OF LIMONIUM GMELINII

Adult Limonium gmelinii plants were maintained at 24 °C for five months then subjected to temperatures of 6 or 24 °C for 5 weeks (12 h photoperiod; PPFD = 65 µmol sec^-1 m^-2). At the end of the temperature treatments, all the plants were sprayed with 0, 250, 500 mg·l^-1 GA3 and held at 24 °C in the same photoperiodic conditions for 160 days.
The low temperature treatment induced flowering within 110-120 days while none of the plants maintained constantly at 24 °C reached flowering throughout the experiment.
GA3 spray (500 mg·l^-1) accelerated bolting and flowering of the plants previously subjected to 6 °C for 5 weeks.
Mean time to flowering decrease was related to the 1st, 2nd and 3rd flower and to an increase of the number of flowering stems observed in such plants.

IV International Symposium on New Floricultural Crops

C. Dalla Guda, E. Scordo, C. Allera, E. Farina

Ornamentals, cut flower, growth regulators

https://doi.org/10.17660/ActaHortic.2000.541.50