Allelopathy Of Lily Root Exudates On Some Receiver Ornamental Plants

Lily is one of the main commodity flowers and deeply favored by customer. In planting, lily should be avoided continuing in the same terra, accordingly, the allelopathy effects of supplier plant lily root exudates on four receiver ornamental plants were studied to provide a theory basis about forming reasonable cultivate system. Pollyanna and White fox as supplier plants, lettuce(Lactuca sativa), snapdragon(Antirrhinum majus), gomphrena(Gomphrena globosa)and starriness(Gypsophila elegans)as receiver plants, the study using hydroponic culture, filter paper culture, tissue culture methods to collect root exudates discussed the allelopathy effects of root exudates and compared merits and demerits of the three methods. The main results were as follows.(1) The hydroponic culture method was used to collect lily root exudates. Allelopathy of two lily cultivars root exudates were researched by biological testing. The results showed that lily cv. Pollyanna have a inapparent inhibit effect on some targets of lettuce and starriness, even have a promote effect on other targets of those, but have a significantly inhibited on germination rate and germination index of gomphrena and snapdragon. The shoot height of starriness were promoted by the root exudates of lily cv. White fox, and the other targets were not significantly inhibited. Lettuce, snapdragon, gomphrena were significantly inhibited by lily cv. White fox. So lettuce and starrines were the tolerant letter crops of Pollyanna. Starrines was the tolerant letter crops of White fox.(2) The filter culture method was used to collect lily root exudates. Allelopathy of two lily cultivars root exudates were researched by biological testing. The root length and the number of lateral root of lettuce and starriness were significantly inhibited by the root exudates of lily cv. Pollyanna, and the other targets were not significantly inhibited. The germination rate and root fresh mass of snapdragon were not significantly inhibited by the root exudates of lily cv. Pollyanna, and the other targets were significantly inhibited. The gomphrena were significantly inhibited by the root exudates of lily cv. Pollyanna excepting the root fresh mass. The root exudates of White fox on four receiver plants, the inhibitory action was bigger than the promoter action. Lettuce and starriness were the tolerant letter crops of Pollyanna. The four receiver plants were not suitable as the latter crops of White fox.(3) To eliminate disturbance of microorganism, the filter culture method was used to collect lily root exudates. Allelopathy of two lily cultivars root exudates and mechanism were researched. The modality targets of starriness(except the top fresh mass) were not significantly inhibited by lily cv. Pollyanna, and TTC reduction was not significantly inhibited, SOD activity was fell, but MDA contents was reduced, which shows the plant was not injured. The lily cv. Pollyanna on the others, the inhibitory action was bigger than promoter action. The root exudates of White fox on four receiver plants, the inhibitory action was bigger than the promoter action. So starriness was the tolerant letter crops of Pollyanna. The four receiver plants were not suitable as the latter crops of White fox.(4) Root exudates collected by three methods consistently exhibit inhibitory action on germination rate and germination index of the four receiver plants, but have a incompletely consistent effect on seedling growth of the four receiver plants. Perhaps, the reason is that there are some difference in growth condition, rhizosphere environment, and the quantity and quality of allelochemicals. Besides, the three studies showed conformably that the allelopathic inhibitory action of root exudates of white fox was bigger than those of Pollyanna. The water culture method is simpleness, convenience and prone to do more analysis. The filter culture method can collect root exudates directly and veritably. The tissue culture method is not restricted by season and environment, and can eliminate influence of plant diseases and insect pests and microorganism.