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| Effects of phosphorus on subcellular distribution and chemical speciation of cadmium in rice |
| Received:March 03, 2017 |
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| KeyWord:rice;phosphorus;cadmium;subcellular distribution;chemical form |
| Author Name | Affiliation | E-mail | | LI Tao | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | LI Jun | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | syau_lijun@163.com | | HAN Ying | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | GENG Jie | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | XUE Fei | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | CHEN Kai | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | |
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| Abstract: |
| To determine the effect of phosphorus on cadmium tolerance in rice, a pot experiment was carried out with two genotypes of rice:Shennong315, a cadmium-tolerant variety, and Huajing1417, a cadmium-sensitive variety. The subcellular distribution and chemical form of cadmium in these two varieties were analyzed at the end of the tillering stage of rice. The results showed that the application of phosphate fertilizer significantly reduced the cadmium content of the two cultivars. The content of cadmium in roots of Shennong315 was higher than that of Huajing1417, and the content of cadmium in stem and leaves was lower than that of Huajing1417. The proportion of cadmium in the cell wall of the cultivars increased significantly with increase in phosphorus, and the proportion of cadmium in the organelle gradually reduced. The chemical binding morphology of cadmium overall proceeded in the order sodium chloride extract > acetic acid extract > distilled water extract > ethanol extract > hydrochloric acid extract. The proportion of acetic acid extract increased with increase in phosphorus. Shennong315 increased by 19.70%~31.32% and Huajing1417 increased by 10.05%~16.36%. The proportion of sodium chloride extract was significantly decreased with increase in phosphorus. Shennong315 fell by 23.38%~40.11% and Huajing1417 fell by 22.55%~39.56%. Therefore, the application of phosphate fertilizer can effectively increase the tolerance of rice to cadmium, and different varieties have different performances. This study provides a scientific basis for the use of phosphorus to alleviate cadmium toxicity in rice. |
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