Poisonous Plant Resources Of Inner Mongolia And Two Speices Of Poisonous Plants Allelopathy Research

In this paper,the method of material consulting and field investigation are combined to determine the list of toxic plants in Inner Mongolia.The basic principle and method of the floristic geography were used to analysis the geographical elements of the flora,and analyzing the life forms and water ecological.According to toxic parts,toxic chemical composition and toxic size of the toxic plants were carried out statistic.The poisonous plant resources in Inner Mongolia were classified according to their use.On this basis,Stellera chamaejasme and Oxytropis glabra were selected as donor plants to study the impact on the germination,seedling growth and the allelopathy on physiological indexes of 5 grassland receptor plants of Melilotoides ruthenica,Astragalus melilotoides,Agropyron mongolicum,Stipa grandis,Stipa krylovii in order to provide the basis which poisonous plants resources reasonable use and for effective protection of natural grassland.The results are as follows:1.There are 351 species wildly poisonous plant in Inner Mongolia belonging to 187genera,67 families.Plant species concentrated on a small number of large families,and its flora has a certain advantage of the phenomenon.Among them,there are 8 families with more than 10 species,which account for 51.9%of the total species,32 families with2-9 species,accounting for 40.40%of the total species,27 families with one species,accounting for 7.70%of the total species.There were 13 genera in 5-more species,accounting for 30.20%of the total genera.There were 43 genera with 2-4 species,accounting for 32.48%of the total genera.There were 131genera with 1 species for37.32%of the total genera.Its accounting for absolute advantage The flora is main of temperate distribution.There are 134 temperate genera,accounting for 84.81%of the total number of genera,and there are 340temperate species,accounting for the total number of species 96.87%.The water ecotypes are absolutely dominant by the mesophyte,272 species,accounting for the total number of 77.5%.The life forms are mainly occupied by the herbage,294 species,accounting for 83.76%.According to the habitat is divided into:grasslands,meadows,forests,mountains and swamps,and the number of poisonous plants distributed in grassland was the highest,for 163 species,accounting for 46.4%of the total species.The number of poisonous plants distributed in swamp was the smallest,only 17 species,accounting for 4.8%of the total species.According to toxic parts is divided into:The whole plant was poisonous,the flowers,fruit and seeds was poisonous,the roots,roots,tubers,bulbs was poisonous,two or more parts and other parts was poisonous,and among them,the total number of toxic plants was 249,accounting for 70.94%of the total;According to the toxic chemical composition can be divided into:containing alkaloids,containing glycosides,containing terpenoid compounds,containing phenols and their derivatives and containing inorganic and simple organic matter,Among them,alkaloids were the most abundant,accounting for34.19%of the total species,and only 25 species including inorganic and simple organic matter,accounting for 7.12%of the total species;Toxicity can be divided into:highly toxic,big toxic,toxic and small toxic,among them,the most poisonous plants were 261species,accounting for 74.36%;According to the use of resources can be divided into:medicinal,edible,industrial and protection and ornamental,among them,there were 328medicinal plants,accounting for 93.45%of the total,and 78 were industrial plants,accounting for 22.22%of the total.2.The different concentrations aqueous extracts from stems and leaves,and roots of Stellera shamaejasme and Oxytropis glabra both have allelopathic effects on seed germination and seedling growth of the 5 plants and the greater the concentration,the stronger the allelopathic effect is.The allelopathic effect of different parts of donor plants on different receptor plants was different significantly,and the allelopathic effect of aqueous extracts of stems and leaves was stronger than that of root aqueous extracts.As for the allelopathy of seed germination,the inhibition was obvious when the concentration of water immersion more than 10 mg·m L^-1,the inhibition was not significant when the concentration of water immersion less than 5 mg·m L^-1.And as for allelopathy on seedling growth,when the concentration of extracts?20 mg·mL^-1,it showed varying degrees of allelopathic promotion.Oxytropis glabra roots,stems and leaves aqueous extracts concentration of less than 5 mg·m L^-1,the recipient plant seedling growth effect was not significant;but when the concentration was increased to mg·m L^-1,the plant growth was significantly promoted.3.The crushed of roots and leaves of Stellera shamaejasme and Oxytropis glabra both have allelopathic promotion to Melilotoides ruthenica,Astragalus melilotoides and Agropyron mongolicum,and have allelopathic inhibition to Stipa krylovii and Stipa grandis,and the promotion of stems and leaves of allelopathic was stronger than roots,crushed roots of allelopathic inhibition stronger than the leaf crushed.The crushed of root,stems and leaves of Oxytropis glabra have alllopathic promotion to the five recipient plant,and the stems and leaves of allelopathic role in promoting stronger than roots,with Stellera shamaejasme and Oxytropis glabra roots,stems and leaves of the amount increasing,which showed allelopathic effects of increased first and then decreased.4.The seedlings POD,CAT and SOD activity of Melilotoides ruthenica and Astragalus melilotoides decreased with the root,stem and leaf of Stellera chamaejasme concentration of extracts increases,but the seedlings of Agropyron mongolicum,Stipa grandis and Stipa krylovii showed an up.The five recipient plants seedlings PRO activity increased with the rising of Stellera chamaejasme and Oxytropis glabra root,stem and leaf concentration of flooding.The five recipient plants seedlings MDA activity increased with the Stellera chamaejasme root,stem and leaf concentration of extracts increasing,but decreased with the Oxytropis glabra root,stem and leaf concentration of extracts increasing.Different concentrations of Stellera shamaejasme and Oxytropis glabra root,stem and leaf aqueous extracts have less soluble receptor protein activity on plant seedlings.5.The CAT,SOD,POD activity of Melilotoides ruthenica,Agropyron mongolicum,Stipa krylovii and Stipa grandis increased with the amount of increase of the root,stem and leaf of Stellera chamaejasme and Oxytropis glabra,but Astragalus melilotoides is to the opposite.The MDA activity of Melilotoides ruthenica,Agropyron mongolicum,Stipa krylovii,Stipa grandis and Stipa krylovii decreased with the amount of increase of the root,stem and leaf of Stellera shamaejasme,but the Astragalus melilotoides increased;the MDA activity of the 5 recipient plants decreased with the amount of increase of the root,stem and leaf of Stellera chamaejasme and Oxytropis glabra concentration,and the five recipient plants proline content increased significantly.