Experiment 3 examined the dormancy- and flower-inducing
effect of a wider range of temperatures during a 5-week SD
exposure. Runner plants were lifted in the field on July 20 and
rooted in 10 cm plastic pots in a glasshouse at 24-h LD and
21 8C. On August 10 the plants were transferred to the A ° s
phytotron and exposed to 10-h SD and 24-h LD for 5 weeks at temperatures of 9, 15, 21 and 27 8C. The plants were then
transplanted into 1.5 l pots and moved into a glasshouse
maintained at minimum 20 8C and with 24-h LD for recording
of flowering and growth performance. Only the SD induced
plants were followed-up for observations on dormancy
relations. The natural day length was extended to 24-h by
low-intensity light (about 8 mmol m2 s1) from 75 W
incandescent lamps throughout the night.