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| Effects of characteristics of cadmium accumulation in vegetative organs on cadmium content in rice |
| Received:August 22, 2021 |
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| KeyWord:rice;cadmium;detached panicle;detached leave;transport factor;chlorophyll |
| Author Name | Affiliation | E-mail | | ZHANG Xin | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Changbo | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yongchun | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Changrong | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | XUE Weijie | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIU Zhongqi | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | liuzhongqi508@163.com |
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| Abstract: |
| To clarify the inhibiting ability of vegetative organs on the transport of cadmium, the characteristics of cadmium accumulation in key organs of three genotypes of rice were studied. The results of a pot experiment showed that cadmium contents in basal stems, panicles, and grains, and the transfer factor of cadmium from basal stems to panicles of T You 705 were higher than those of Zhaoyang 1B and Xiangzaoxian 24. When detached panicles were cultured in Hoagland solution with 0.9~4.5 μmol·L?1 cadmium, the cadmium content in grains and panicles showed a significant linear correlation. As the cadmium content increased by 1.0 mg, the cadmium content in the grains of Zhaoyang 1B, Xiangzaoxian 24, and T You 705 increased by 0.01, 0.11 mg, and 0.14 mg, respectively. The basal grains of T You 705 had the weakest ability to intercept cadmium. The amount of cadmium ions that entered detached leaves directly determined the decay rate of chlorophyll. When detached leaves were exposed to a 0.9~18.0 μmol·L?1 cadmium solution, the chlorophyll contents of Zhaoyang 1B and Xiangzaoxian 24 decreased about 0.02 mg for every 1.0 mg of cadmium absorbed by the detached leaves. The chlorophyll content of T You 705 decreased 0.01 mg under the same condition. Under the same cadmium stress environment, the degree of oxidative damage of T You 705 was weakest, and the amount of O2-and H2O2 released was significantly less than in Zhaoyang 1B and Xiangzaoxian 24. These results indicate that the cadmium interception ability of basal grains in low cadmium-accumulating varieties is stronger than the ability in high cadmium-accumulating varieties and that leaves of low cadmium-accumulating varieties are more sensitive to cadmium stress than leaves of high cadmium-accumulating varieties. The cadmium transport characteristics of detached panicles and the cadmium tolerance of detached leaves can be used as criteria for screening low accumulation genotypes. |
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