
Screening of Rice Varieties with Low Accumulated Cd under Different Levels of Cd Stress
1st author: 45940970@qq.com
Received date: 2020-11-05
Online published: 2021-01-20
The absorption and accumulation of Cd in 10 rice varieties were studied by pot experiments under different levels of Cd stress. The results showed that rice has a strong ability of absorbing and accumulating Cd, but there were significant differences in the absorption level in different rice varieties. The difference in Cd content of different rice varieties under the same conditions is as high as 7.36 mg/kg. By measuring the relative content(SPAD)of chlorophyll, it was found that with the increase of the content of exogenous Cd, the SPAD value of rice showed a trend of first increasing and then decreasing. It indicated the low content of Cd promote the growth of rice, while high content of Cd inhibit its growth. A low-accumulation Cd rice variety, F You 498, was selected by cluster analysis. Its Cd content in grain was only 0.15 mg/kg(without adding exogenous Cd), which was lower than the limit value stipulated by the national food safety standards(0.20 mg/kg). Correlation study found that rice had a good absorption effect of Cd in soil generally, and rice will accumulate lots of Cd with the increase of Cd content in soil. Therefore the selected low Cd accumulation rice variety were only suitable for planting in non-pollution or lightly Cd pollution areas.
Key words: cadmium; rice; chlorophyll; Cd low accumulation rice variety
Ping WANG, Muxinjian LUO, Jing LIU, Maoyuan TIAN, Guanqun CHAI, Song QIN . Screening of Rice Varieties with Low Accumulated Cd under Different Levels of Cd Stress[J]. China Rice, 2021 , 27(1) : 75 -79 . DOI: 10.3969/j.issn.1006-8082.2021.01.014
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