Accumulation of Lead(Pb) and Its Effects on Growth and Physiological Status in Tomato

Accumulation of Pb as well as growth physiological status in tomatoes grown in solution culture under stress of different Pb concentrations were investigated in the present study.The results showed that growth of tomato was inhibited obviously in the culture solution containing different concentrations of Pb,and biomasses of the each organs for the plant were less than the corresponding parts of the control.Leaf of the tomato appeared chronic symptom with different degrees.It was indicated that the tomato was capable of absorbing Pb via its root.The accumulation and distribution of Pb in the tomato were found to be in an order:rootstemleaf.Pb significantly decreased contents of chlorophyll(Chl) and photosynthesis rates(Pn) in leaves of the tomato cultivated in solution culture.The heavy metal could inhibit the growth of the plant roots in our test.