Research on the Response of Green Bean Seedlings to the Stress of Cr~(3+)

[Objective] The growth and physiological character of green bean seedling,which growth process was under the Cr3+ stress,was researched.[Method] The response of bean seedling that was cultured in sands to the environmental stress of Cr3+ was analyzed.[Result] The treatment of Cr3+ with the content of 90 mg/L could increase the root vitality of bean seedling,and with the concentration-increasing of Cr3+,its root vigor decreased and its root aging sped up,for example,when the content of Cr3+ was 150 mg/L,its root activity was 56% of the CK's.The response of bean seedling to the treatment of Cr3+ in the antioxidant enzyme such as superoxide dismutase(SOD) and catalase(CAT) and others was different and when the concentration of Cr3+ was in the range of 10-90 mg/L,its root activity rose,which was higher than that of CK,then,it was in downward trend,which was lower than that of CK.When the concentration of Cr3+ was 150 mg/L,the activity of SOD and CAT was 51% and 53% of CK,respectively.The content of proline and MDA was raised with the concentration-increasing of Cr3+.[Conclusion] The treatment of low concentration of Cr3+(≤ 50 mg/L) had little effect on the growth of bean seedling and could improve its plant resistance but the treatment of high concentration of Cr3+ would inhibit the bean seedling growth.