Effect of Photoperiod on Flowering of Cypress Vine (Ipomoea quamoclit L.)

摘要

Plants of Ipomoea quamoclit L. were exposed to an 8-hour photoperiod under natural daylight, which was supplemented with 60 W incandescent lamps to give an 8- to 24-hour day. Under photoperiods of 12 hours or less, flower buds were initiated, while the period from bud formation to flowering was shortened in plants grown under a 12-hour photoperiod. Photoperiods of 12 hours or less had no effect on plant height and number of nodes. The present results suggest that Ipomoea quamoclit L. is a short-day plant.