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WU Qi Tang, CHEN Lu WANG Guang Shou (South China Agricultural University,College of Resources and Environmental Sciences,Guangzhou,510642,China)  
Cadmium uptake and accumulation for some rice ( Oriza sativa )cultivars in South China were studied with pot experiment and hydroponic crop.The mechanism resulting in the differences among cultivars was also studied.Results with pot experiments showed that,among more than 20 cultivars grown on the same contaminated soil,the hybrids such as Shanyou 63,Shanyou 64 harvested a higher yield and Cd content in husked rice was also higher.The high consuming quality cultivars such as Yeaosimiao,Zengchengsimiao and Heinuo,resulted in a lower Cd content in husked rice.The normal cultivars varied more greatly on yield and Cd content.The Cd content in high accumulating cultivars was more than 2 fold higher than that of the low accumulating cultivar.Under the same hydroponic crop conditions,the low accumulating cultivar,Yeaosimiao,showed less water consumption per gram of yield,lower ration of roots to aerial parts and lower Cd translocation rate to grains than the high accumulating cultivar,Shanyou 63。The Cd translocation rate for the high and low accumulating cultivars was 38 4% and 16 2% respectively,more than 2 fold of differences.This is maybe the most important factor causing the differences among the rice cultivars on the Cd accumulation.
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