Study On Reproductive Ecology Of Lilium Pumilum DC.

Lilium pumilum,Which has scarlet flowers,moderate height,as well as ability of resistance of disease,heat and salt,is a main parent of resistance breeding of lily. 24 year-old L. pumilum cultivated in different environment in Northeast forestry university in Harbin and wild L. pumilum in Daqing are studied in this paper.The study shows that (1) there are only 13.55 percent of cultivated 2-year-old L. pumilum developing into reproductive stage and all above 3-year-old L. pumilum are flowered;(2) the breeding system of L. pumilum is mainly outcrossing,and party incrossing,in both of which pollinators are needed;(3) L. pumilum no multi-paternal effect shows in L. pumilum,where the seeds from single-paternity cross have relatively high activity;(4) pistil mature earlier,whose chapter shows pollination 5 days before blooming ;(5) the rate of mature is half as high as natural crossing;(6) pollen of L. dauricum and Lcernum has strong inference with on the reproduction of L. pumilum.Pollination insects are mainly butterfly and bee. The kinds of insects are different under different environment and year,between which Lasioglossun denticotte has the strongest pollination activity. The peak time that insects secrete honey is consistent with that of insects' visit to flower. Climate also has influence on which kind of flower,how soon and how insects visit flowers the frequency of insects' visit is positively related with air temperature,and negatively related with air humidity.The average distribution of each organ in the flowering plants in Harbin is listed in turn:scale stem (59.56%)>leaf(13.03%)>stem(12.63%)>reproductive organ (9.09%)>root(5.69%);The average distribution of each organ in the flowering plants under tree in Harbin is listed in turn;scale stem(52.02%)>stem( 17.73%)>leaf( 17.39%)>root(7.70%)>reproductive organ (5.13%);The average distribution of each organ in the flowering plants in nature in Daqing is listed in turn:scale stem (73.92%)>stem (12.52%)>leaf (8.80%)>root (2.77%)>reproductive organ (1.83%);The average distribution of each organ in the level of full nitrogen in Harbin is listed in turn :leaf (2.19%)>reproductive organ (1.5%)>scale stem (1.16%)>root (1.03%)>stem (0.99%);The average distribution of each organ in level of full phosphor in full sun in Harbin is listed in turn:reproductive organ (0.0322%)>scale stem (0.0316%)>stem (0.0287%)>root (0.0266%)>leaf (0.0264%) ;the level of full nitrogen and full phosphor in stems and leaves are markedly positively related with season.Seeds of 2-year-old L. pumilum are suitable to bourgeoned at 20,which are not sensitive to light;3-year-old are suitable to bourgeoned at 20,which are linked with light.;Seeds of L. pumilum in nature are suitable to bourgeoned at 20,which are restrained with light;Every-other-tear seeds of I. pumilum are suitable to bourgeoned at 25 ,which are raised by light;and its germination rate doesn't influence.As cultivated,the total number of L.pumilum which can develop small scale stem spontaneously is less than 12.3% of the total plants. The optimal condition for growth of smallscale stem is 25 and sunshine-free. Moreover,the number of little bulb is linked with the position of scale stern.