The Study On Reproductive Ecology Of Wild Lilium Distichum

In this paper, The wild Lilium distichum were did as experimental materials. I studied the population structure, natural habitats, phenology, flowering biology, reproductive allocation and mechanism of seed dormancy.The wild Lilium distichum Seeded from late April, ripen at early October, leaf to flowering period is its important view. The pattern of Lilium distichum by growth may be classified into 3 types:the rigorous growth type, the type whose growth have vane, but don't pumping the scape and the type only grows basal leaves. Canopy density of habitats (the late leaves showing to late ovary enlargement) more than 0.8. In the growing season of Lilium distichum at the plot the average light intensity is less than 35.53μmol·m-2·s-1, even lower than 11.34μmol·m-2·s-1 in the following stage; The average air humidity is 50.1% or more, even higher than the 86.6% in the flowering stage (Light intensity and air humidity is 06:00-18:00 on average).The Lilium distichum is the raceme, the most with 3-6 flowers, individual flowers bloom for 6-8 days. Throughout the flowering period the Pollen exist the vitality and is decreased. From flower opening to wilting, the stigma all have the receptivity, in the 2-4 days of bloom the receptivity is the strongest. With the pistil and stamen maturing at the same time and the flowering characteristics ensure the possibility of self-pollination, P/O value and OCI testing also identified that Lilium distichum is the facultative xenogamy. In the Studying site the main visiting insects of Lilium distichum are Pieris rapae and Achillides Manor. The relative reproductive success of wild Lilium distichum is relatively low, the relative reproductive success observed for two years (2009 and 2010)was less than 6%, in 2010 even lower than 0.85%.The average biomass allocation of Lilium distichum building block in different growth stages decreased in the order:bulbs>stems>leaves>reproductive building block>roots. Reproductive biomass allocation of reproductive building block increased about 3 times from bud to anthesis. The various components of the reproductive structures (buds, flowers or fruits) was higher allocation, stems, leaves and bulbs followed by distribution and more uniform. In addition to the amount of root distribution of P is the similar with stems and leaves or less, N. K distribution are all relatively low.The Lilium distichum is one of the most difficult type of reproduction in Lilium. Seed germination belongs cotyledon left soil type, germination time is long and germination rate is low. There is a strong internal inhibit seed germination inhibitor. In the shell cracking collect seeds, low viability measured at 30% or less. In the treatment of a variety of seeds to do to promote seed germination is not obvious to speed up. About the past two months later began to germination and germination rate is very low. Even for the seed of Lilium distichum embryo culture in vitro, is still only a few can slow germination.