Abstract:

For understanding the resistance differences of tall fescue to cadimum pressure and how to work in recovering the cadmium contaminated soil, the author analyzed the variation of morphology and physiology index before and after the cadmium treatments in different concentrations. The author analyzed the variety ‘Houndog’ with the treatment of different concentration of cadmium chloride. The results showed the leaf fresh weight, root fresh weight, maximum root length, and chlorophyll content stimulated in lower concentration of cadmium, but suppressed over the threshold value. The relative leakage ratio, MDA content, and proline content displayed continued increasing, while root activity declined with the concentration of cadmium increased. Further analysis of 9 tall fescue varieties was conducted for the traits of leaf fresh weight, root fresh weight, and maximum root length with the treatment of 50 mg/L cadmium chloride. The results showed the resistance mostly correlated with the performance of root characteristics. The resistance level totally ranked as Cross Fine II>Picasso>Houndog>Masterpiece>Starlet>TripleA>CochiseIII>Airui>Davinci. It concluded that the variety of Cross Fine II with higher comprehensive resistance level to cadmium could be used in heavy contaminated soil, while the variety of Starlet could be screened in the minor contaminated soil.