Phenology of Lilium polyphyllum : in Garhwal Himalaya, India.

摘要

Phenological progression in Lilium polyphyllum was observed under two climatically different natural habitats i.e. temperate and high altitude. In nature, radicle emergence was observed after 75 days of sowing at 17-19 degrees C soil and air temperatures. A bulblet was developed after 25 days of germination in July, but emergence of first true leaf was delayed until the next year, 277 days after germination. This juvenile phase continued with development of aerial parts as well as bulb and remained for more than 4 years. The juvenile phase was followed by virginal phase during which an aboveground shoot without flower was produced annually for 3-4 years, after which the reproductive phase began. The flowering period lasts for 15-20 days and was at peak when air and soil temperatures ranged from 11-19 degrees C and 15-17 degrees C, respectively in both regions. Initiation of flowering was earlier in the temperate than in the high altitude site. Seed setting was initiated during August and continued for 2 months to mature. There onwards, seed dispersal was occurred until mid-November. Underground bulb also showed marked variation in size, number of scales and roots during different phenophases. Since phenophases are the best indicators of plant responses to the environment, seasonal timing of events can be critical for survival of life and reproduction.