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Effect of High Concentrations of Cd Stress on the Physiological Characteristics, Absorbtion and Accumulation in Tea Plant

WANG Chun-mei1,TANG Qian1,ZHANG Xiao-qin1,ZHANG Dong-chuan2 1.College of Horticulture,Sichuan Agricultural University,Ya’an 625014,China;2.Technology of horticultural crops in Sichuan Station,Chengdu,610000,China  
Through the soil pot experiment,investigation on the influence of high concentrations of cadmium stress on the growth,absorbtion and accumulation physical characteristics of tea plant by using Mingshanbaihao cultivar as testing material.The results showed that: Tea plants did not show obvious symptoms under the cadmium concentration of 0~120 mg/kg.The growth of various organs,chlorophyll synthesis and photosynthesis were significantly inhibited by increasing concentrations of Cd.Superoxide dismutase(SOD),peroxidase(POD),catalase(CAT) activity were gradually reduced accordingly.The content of malondialdehyde(MDA),proline(Pro) and relative conductivity(RC) increased substantially.Cadmium in various organs(y) had a significant or highly significant positive correlation with Cd concentration(x1) and available cadmium content in soil(x2).The order of cadmium contents in various organs was Fibrous roots Roots Stems Branches Leaves New sterns.The migration of available cadmium in soil from the underground parts to aboveground parts was the main source of cadmium in tea plants.Cadmium in tea plants mostly fixed by fibrous roots and roots,simultaneously,only a low ratio was transported to aboveground.
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