The characteristic analysis on the relative aluminum tolerance fornine varieties of Gramineae and Compositae

In order to control aluminum (Al) toxicity in acid soil area with biotechnological methods efficiently to, provide good living basis for crop production, nine plants of Gramineae and Compositae were tested for their reactions to Al toxicity by smallpot soil culture method. By comparing the relative tolerance index values through tested the Biomass, leaf area, ratio of root to top and specific leaf area (SLA) of different plants under two Al treatments, Alresistant plants were screened. The results showed that the plant of Gramineae was more Alresistant than the plant of Compositae after Al treatment of 0.2 g/kg. The relative fresh weight of roots, shoots and leaves, relative dry weight of root, shoot and leave and relative rootshoot ratio in Eleusine indica and Digitaria ciliaris of Gramineae were higher than others. Eclipta prostrate of Compositae was sensitive to Al, the values was the lowest one. There was significant correlation in relative fresh weight of root and leave and relative dry weight of root of Gramineae. The result of principal component analysis showed that relative fresh weight of roots could be used as screening index of Al tolerance in Gramineae and Compositae.