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| Effects of Selenite/Selenate and Their Coexistence in Plant on Selenium Uptake and Translocation in Rice |
| Received:May 13, 2014 |
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| KeyWord:selenate;selenite;coexistence;root split technique;translocation |
| Author Name | Affiliation | E-mail | | HUANG Qing-qing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | CHEN Si-yang | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | WANG Qi | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | QIAO Yu-hui | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | JIANG Rong-feng | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | LI Hua-fen | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | lihuafen@cau.edu.cn |
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| Abstract: |
| Selenium(Se) exists as both selenate and selenite in soil, and plant roots can take up these two ions. A root splitting system experiment was carried out to study the effect of selenite/selenate and their coexistence in plant on selenium(Se) uptake and translocation in rice seedlings. Selenate(Na2SeO4) and selenite(Na2SeO3) uptake kinetics by rice were also investigated in solution culture. When both sides of the root splitting system was supplied with either Na2SeO3 or Na2SeO4, the concentration of Se was 117.8 mg·kg-1 and 9.85 mg·kg-1 in rice roots, and 1.39 mg·kg-1 and 6.14 mg·kg-1 in rice shoots, respectively. Transfer factor of Se from roots to shoots was respectively 0.01 and 0.69. However, when the system was supplied with Na2SeO3 in one side and Na2SeO4 in the other side, Se concentration in rice roots was 103.1 mg·kg-1 on Na2SeO3-supplied side and 18.9 mg·kg-1 on Na2SeO4-supplied side. The Se concentration in rice shoots was 6.26 mg·kg-1 and Se transfer factor was 0.10. The coexistence of selenite in rice plant enhanced selenate uptake by rice seedlings, while the existence of selenate had no significant effect on selenite uptake. The selenite uptake rate was 13 times greater than that of selenate. The affinity of rice root to selenite was weaker than that of selenate. |
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