Abstract: Using the seeds of Jatropha curcas L. as the experimental materials and employing the pot sand culture method, the physiological and ecological responses of Jatropha curcas L. seedlings under different temperatures and aluminum concentrations were studied. The results showed that on the 7th day of stress, compared, with the control there was no significant difference in the MDA content of Jatropha seedlings treated with 100 μmol/L aluminum stress at 25 ℃ . The activities of CAT, POD and APX all increased compared with the control, the activity of SOD decreased by 35.1%. At 15 ℃, the Pro content of Jatropha seedlings gradually increased with the increase of aluminum stress concentration. Under the aluminum stress treatment, except for the 200 μmol/L aluminum stress concentration, the SS content and POD activity were both higher than those under the 25 ℃ treatment. The contents of MDA and Pr were higher than those under the 25 ℃ treatment regardless of the control or the aluminum stress treatment. On the 14th day of stress, the MDA, Pr and SS contents of control in Jatropha seedlings at 15 ℃ were 1.52 times, 1.26 times and 2.43 times that of the control at 25 ℃, respectively. High concentration of aluminum inhibited the activities of SOD and APX, and the double stress of low temperature and aluminum inhibited the activity of POD. Research showed that short-term low-concentration aluminum stress had little effect on the growth of Jatropha seedlings. Under long-term aluminum stress, the damage suffered by Jatropha wasn’t related to low temperature. Aluminum stress was the main factor restricting the growth of Jatropha seedlings.

Key words: Jatropha seedlings, aluminum stress, temperature, physiological indexes