Effect Of Arbuscular Mycorrhizal Fungi On Growth Of Ryegrass In Cadmium Contaminated Soils

For the annual ryegrass grass monocots, its regeneration ability, easy to grow, biomass greater resistance to pests and disease, resistance to trampling, and long green features is an important cultivated forage and green manure crops, widely used in China on planting grass, planting grass, mowing and grazing lands, has high economic value. Reports show that ryegrass has a strong resistance to heavy metals, and the role of the heavy metals build sets. This study of the cadmium contamination and ryegrass plants inoculated AMF test,more systematic study of arbuscular mycorrhizal fungi on ryegrass under conditions of cadmium pollution growth, nitrogen and phosphorus absorption of nutrients and physiological implications. The results were summarizeed as follows:1.With mycorrhizal fungi (G.mosseae) on ryegrass inoculated Cd found in the heavy pollution (Cd2+:180mg/kg) conditions, G. Mosseae root colonization rate of the ryegrass reached 30.23%, and on the growth of ryegrass better facilitated. Show that the strain on the heavy metal cadmium has a strong tolerance.2.Mycorrhizal some extent alleviated the cadmium pollution on the ryegrass plant height, root length and biomass inhibition, but also eased on the roots, leaves and whole plant of N, and P content in vitro. Inoculated plant growth conditions were much better than non-inoculated plants under cadmium pollution, arbuscular fungi for the ryegrass on the absorption of mineral elements and plant growth, and enhance the ryegrass in cadmium tolerance in contaminated soil has to vital role.3.Cadmium effect on the physiological response of ryegrass, ryegrass cadmium significantly reduced chlorophyll content. Cadmium pollution in the moderate and severe cadmium contamination mycorrhizal inoculation significantly increased the chlorophyll content of ryegrass, indicating a higher inoculum concentration of cadmium pollution on the plant has good repairing effect, can increase the plant chlorophyll content, to ensure the normal operation of plant photosynthesis.4. In cadmium polluted conditions, compared with non-inoculated ryegrass inoculated with mycorrhizal fungi can significantly stimulate the soluble protein content of ryegrass, so slowing the osmotic stress; Under cadmium inoculated mycorrhizal fungi can reduce ryegrass leaves membrane permeability, MDA content, decreased the cadmium pollution on the cell membrane, thus increasing the ryegrass on cadmium tolerance, its tolerance to improve and enhance the mycorrhizal root system and leaf SOD, POD, CAT activity increased about.