| 黄青青,陈思杨,王琪,乔玉辉,江荣风,李花粉.亚硒酸盐/硒酸盐及相互作用对水稻吸收及转运硒的影响[J].农业环境科学学报,2014,33(11):2098-2103. |
| 亚硒酸盐/硒酸盐及相互作用对水稻吸收及转运硒的影响 |
| Effects of Selenite/Selenate and Their Coexistence in Plant on Selenium Uptake and Translocation in Rice |
| 投稿时间：2014-05-13 |
| DOI：10.11654/jaes.2014.11.004 |
| 中文关键词: 硒酸盐 亚硒酸盐 共存 分根 转运 |
| 英文关键词: selenate selenite coexistence root split technique translocation |
| 基金项目:国家自然科学基金项目(41073094);农业部公益性行业专项(201303106) |
|
| 摘要点击次数: 3196 |
| 全文下载次数: 2935 |
| 中文摘要: |
| 采用分根装置及营养液水培方法研究了硒酸盐(Na2SeO4)和亚硒酸盐(Na2SeO3)及其在植物体内相互作用对水稻吸收及转运硒的影响,以及水稻根系对硒酸盐和亚硒酸盐的吸收动力学。分根装置中水稻根系左右两侧都供给亚硒酸盐或硒酸盐时,水稻根系硒含量分别为117.8 mg·kg-1和9.85 mg·kg-1,地上部硒含量分别为1.39 mg·kg-1和6.14 mg·kg-1,硒向植株地上部的转移系数分别为0.01和0.69;分根装置中右侧供给Na2SeO3的水稻根系硒含量为103.1 mg·kg-1,左侧供给Na2SeO4的水稻根系硒含量为18.9 mg·kg-1,地上部硒含量为6.26 mg·kg-1,转移系数为0.10。亚硒酸盐的供给促进了水稻根系对硒酸盐的吸收,而硒酸盐对水稻吸收亚硒酸盐的影响不显著。吸收动力学结果显示,水稻根系对SeO32-的最大吸收速率是SeO42-的13倍,但是水稻根系对SeO32- 的亲和力低于对SeO42-的亲和力。 |
| 英文摘要: |
| 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. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
