Identification of the Cadmium AccumulationCapabilities of 20 Rice (Oryza sativa L.) Genotypes

In some areas, the paddy fields have been contaminated to varying degrees by heavy metal cadmium (Cd).In order to reduce the accumulation of Cd in rice (Oryza sativa L.), 20 different rice genotypes were exposed to a 1 mg/L Cd condition to assess their Cd accumulation capabilities.The treatment of Cd resulted in a decrease in plant height for most rice materials, with the exception of "Jiaxiang3A/6139".Additionally, the treatment of Cd had varying effects on the plant height and biomass.The resistance index ranged from 0.40 to 1.49, with "Jiaxiang3A/6139" demonstrating the highest resistance.The root Cd contents in the different rice materials ranged from 267.49 to 540.84 mg/kg, while the shoot Cd contents ranged from 38.20 to 121.76 mg/kg."Mianhui6139" had the highest shoot Cd content, whereas "Jiaxiang3A/6139" had the lowest.The Cd translocation factor of rice materials varied between 0.076 and 0.431.Furthermore, cluster analysis revealed that "Mianhui6139" and "Shen9A/815" formed a distinct category, "Yulong1A/815" and "Mianhui815" formed another category, and "Chuankangyou6139" and "Jiaxiang3A/6139" formed a separate category.The remaining 14 rice materials were grouped into a different category.Therefore, "Jiaxiang3A/6139" is a promising candidate for breeding and safe production of rice in Cd-contaminated paddy fields due to its low-Cd accumulation capabilities.