Abstract: In order to study Pb absorption law and physiological index variation trend in main product organs of taro,taking the taro variety 8520 as test materials,plants grown in soils through pot experiment were treated with different concentrations of Pb²⁺,and the differences of Pb accumulation,changes of some physiological indexes in different organs of taro were analyzed.The results showed that a highly significant positive correlation was observed between the Pb accumulation in different organs and the Pb²⁺ concentration in soil,and bulbs were easier to absorb Pb followed by leaves and petioles in taro.Compared with control,the activity of three antioxidant enzymes (SOD,POD and CAT) increased under low Pb²⁺ concentration (100 mg/kg) treatment,then the activity of POD and CAT in leaves and petioles were still on the rise,but other enzyme activities showed the trend of decline as the concentration of Pb²⁺ gradually increased to 2 000 mg/kg.The proline and MDA content of three organs (bulbs,petioles and leaves) expressed a downward trend after the first rise with increasing Pb²⁺ concentration,and mostly reached the maximum when the Pb²⁺concentration was 1 000 mg/kg.

Key words: Taro, Pb stress, SOD, POD, CAT, MDA, Pro

CLC Number: 

• S143.7