Abstract
The physiological effects of Cd, Pb and Ti combined stresses on 3-year-old Olive seedlings were studied in this experiment and the change of heavy metal content in the soil after stress. The results showed that soluble protein, SOD activity and soluble sugar increased first and then decreased with the increase of Cd and Pb combined stress concentration, and then increased again with the addition of 2% and 4% Ti. POD activity decreased first then increased, MAD activity decreased first increased then decreased. The change of heavy metal content in the soil after stress first increased then decreased. Therefore, when the content of heavy metals in soil is low, olive can defend and repair itself to reduce the harm of growing environment. On the contrary, when the metal content in soil is too high, the decrease of plant stress resistance will be detrimental to its growth.
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