|
Orostachys iwarenge recorded in 1977 in Korea, is a biennial succulent and herbaceous plant distributed at seaside cliff crevice in Seogwipo City, Cheju Island, Korea. When subjected to three photoperiods, leaf width and length increased more under short (8 hrs day/16 hrs night) or intermediate (12 hrs day/12 hrs night) than under long day (16 hrs day/8 hrs night) condition. Leaf number per plant was significantly increased as daylength prolonged. Floral initiation was 100% under long-day and 50% under intermediate daylength condition, and no flowering was observed under short - day condition. In conclusion, Orostachys iwarenge was assumed to be a long-day plant for flower initiation. Leaf width, leaf length and crown diameter were under the controlled different light intensities significantly increased as light intensity decreased, but leaf number was clearly decreased. Leaf orientation was downward under shade (10,000-15,000 Lux), horizontal under half-shade (30,000-35,000 Lux) and upward under sunny condition (60,000-65,000 Lux). Ornamental value of the plant was more promoted under half-shade condition than under either sunny or shade condition.
|