3. Results
3.1. Effect of photoperiod on vegetative growth and flowering of
TDC
All plants that were grown under 7 types of photoperiods eventually formed visible floral buds, although the time to first flower
opening was different. The longer the photoperiod was, the earlier
the plants flowered (Fig. 1). The plants that were exposed to photoperiods of 14 h, 16 h, 18 h, 20 h and 24 h (day-length) flowered
significantly earlier than those plants that were treated under 10 h
and 12 h (Table 1). Thus, TDC could be defined as a LD plant, of which
the critical day-length was 14 h. Additionally, the longest time to
first flower opening was 279.0 d under 10 h, and the shortest time
was 247.8 d under 24 h.
At the time of first flower opening, no significant differences in
the crown diameter, flower number per inflorescence, and scape