Research On Allelopathy Of The Aqueous Extracts And The Root Exudates Of Lilium

Allelopathy exists widely in nature. The deep researches on allelopathy are beneficial to plants scheme, cultivation and planting in scientific, strengthening the promotion and weakening the inhibition between plants, promoting biology diversity, sustainable agricultural development. Allelopathy is an important reason for that replant makes against lily (Lilium brownie F.E.Brownvar), and it is bad for lily if the foregoing is liliaceous plant. At present, the research of lily on allelopathy is little. In this paper, Lilium Siberia was selected as our research object, made research on its allelopathy and the existence of autotoxicity through aqueous extraction bioassays and tissue culture methods. The main contents are as follows.1. Leaf-stem, flower, bulb of lily as donor materials, the allelopathy of lily plant every organs aqueous extracts on seed germination and seedling growth of receiver materials were studied. The primary results showed that every organs aqueous extracts had allelopathy on receiver materials, including lettuce, cucumber, tomato, radish, and Welsh onion. Different concentrations of aqueous extracts had different effects. As the concentration of extracts increased, the suppression increased, the aqueous extracts decreased the germination rate and germination index of seeds, shortened the root length, seedling height and fresh weight at the concentration of 5~10 g/100mL, even made seeds of tomato, radish, and Welsh onion decay. On the contrary, the suppression disappeared and even changed into stimulating effects when the concentration of extracts declined. So, there were dual effects on the concentration of extracts. Sensitivity to the aqueous extracts was different among the receivers in this study, Welsh onion, tomato, and radish were most sensitive to the allelopathy of lily extracts, lettuce took second place, and cucumber was last.Moreover, the investigation showed that the extract of different organs of lily affected seeds germination and growth to a different extent, and the effect of flower and bulb was stronger than leaf-term.2. The other important way of allelochemicals release is root exudates. Tissue culture methods were used to simulate the allelopathy effect of lily root exudates under sterilized conditions. Bioassays showed that the root exudates of lily could inhibit the receiver seeds...