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Effects of phosphate on physiological and biochemical characteristics of tea plants leaves under Al and F interactions

we studied the physiological and biochemical characteristics of tea plants leaves were affected by different concentrations of phosphate(P)(consisting of 0,0.2 and 1.0 mmol/L) through hydroponic cultivation experiments of Camellia sinensis L(baicha and zhirenzaocha) under aluminum(Al) and fluorin(F) interactions.The results follow showed:(1) Compared with the four non-P treatments,an obvious upward tendency of soluble protein,chlorophyll and polyphenols contents and superoxidedismutase(SOD),peroxidase(POD) and catalase(CAT) activity was observed in the treatment of 0.2 mmol/L P under single Al or F.Meanwhile these indexes reached maximum values except the content of chlorophyll under 5.0 mmol/L Al and 1.0 mmol/L F interactions in zhirenzaocha.This suggests proper concentration of P can weaken oxidative injury-caused by Al and/or F and inhibit lipid peroxides by increasing antioxidative enzyme acitivities.(2) With the increasing concentrations of P,the soluble protein,chlorophyll content,polyphenols contents and superoxidative dismutase(SOD),peroxidase(POD),catalase(CAT) activities were all fell to the minimum level,which were all below non-P and the control.The fact that the treatment of 1.0 mmol/L P can not alleviated the toxonosis-caused by Al and F interactions implies detoxication depends on concentration of P and beyond the concentration range,it restrains detoxication.(3) The sensibilities between baicha and zhirenzaocha according to the P stress were differed and order was sorted as follows:zhirenzaocha baicha.Therefore,the concentration of P plays a high impact on physiological and biochemical characteristics of young tea plants and detoxication of P is associated with variety under Al and F interactions.