| 焦欣田,薛卫杰,赵艳玲,张长波,闫雷,刘仲齐.硅锌互作对水稻幼苗镉吸收转运特性的影响[J].农业环境科学学报,2018,37(11):2491-2497. |
| 硅锌互作对水稻幼苗镉吸收转运特性的影响 |
| Effects of silicon and zinc interaction on the uptake of cadmium in rice seedlings |
| 投稿时间：2018-07-09 修订日期：2018-09-25 |
| DOI：10.11654/jaes.2018-0880 |
| 中文关键词: 水稻 镉 硅 锌 可溶性蛋白 |
| 英文关键词: rice cadmium silicon zinc soluble proteins |
| 基金项目:国家重点研发计划项目（2017YFD0801100）；中国农科院科技创新工程项目（CAAS-XTCX2016018） |
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| 中文摘要: |
| 以湘早籼24幼苗为实验材料，通过添加不同浓度巯基硅和硫酸锌的水培试验，对水稻幼苗中总Cd含量、各亚细胞组分Cd含量、必需元素及可溶性蛋白的变化进行了研究，旨在探讨根际环境中添加Si和Zn离子抑制水稻Cd吸收转运的互作机理。结果表明：在含Cd 2.7 μmol·L-1的营养液中添加0.05 mmol·L-1和0.1 mmol·L-1的巯基硅能使水稻根系的Cd含量分别下降5.4%和34.7%，使地上部的Cd含量分别下降3.5%和51.8%。Si和Zn共存时对Cd的抑制作用更加明显，同时添加0.2 mmol·L-1 Zn和0.05mmol·L-1或0.1 mmol·L-1的巯基硅，使水稻幼苗根系中的Cd含量分别下降27.4%和68.9%，使地上部的Cd含量分别下降78.0%和88.0%。Si-Zn互作使得根系细胞壁组分中的Cd分配比例和地上部胞液组分中的Cd分配比例显著下降；同时还促进了根系对K、Ca、Fe、Zn等元素的吸收以及向地上部的转运。在Cd胁迫环境中，添加Si和Zn能显著提高根系中可溶性蛋白的含量，但对地上部的可溶性蛋白含量无显著影响。这些结果说明，增加根际环境中的Si和Zn浓度能促进根系对Cd的固定和根细胞中可溶性蛋白的合成，通过促进必需元素的吸收转运，显著抑制根系原生质体对Cd的吸收和向地上部的转运。 |
| 英文摘要: |
| The mechanism of Si-Zn interaction in the root rhizosphere of rice seedlings that inhibits the uptake of Cd was studied. Experimental results show that the addition of 0.05 mmol·L-1 and 0.1 mmol·L-1 sulfhydryl silicon into the nutrient solution with 2.7 μmol·L-1 Cd reduced the Cd content in rice roots by 5.4% and 34.7%, and in shoots by 3.5% and 51.8%, respectively. The coexistence of Si and Zn displayed more significant inhibition on Cd uptake. The addition of 0.2 mmol·L-1 Zn and 0.05 mmol·L-1 or 0.1 mmol·L-1 Si reduced the Cd content in the rice roots by 27.4% or 68.9%, in shoots by 78.0% or 88.0%, respectively. The interaction of Si-Zn significantly reduced the Cd distribution proportion in the cell walls of roots and in the cytoplasm fraction of shoots. Simultaneously, the coexistence of Si and Zn promoted the absorption of essential elements, such as K, Ca, Fe, and Zn, by the roots and their subsequent transfer to the shoots. In the Cdstress environment, the addition of Si and Zn significantly increased the content of soluble proteins in roots, but had little effect on shoots. These results indicate that increasing the concentrations of Si and Zn in the root rhizosphere can promote the fixation of Cd in roots and the synthesis of soluble proteins in root cells by promoting the absorption and transfer of essential elements, finally inhibiting the transfer of Cd from root cytoplasm to shoots. |
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