以新疆泌盐植物小獐毛(Aeluropus pungens)为材料，研究盐胁迫下小獐毛植物体元素吸收、分泌和过氧化物酶活性的变化以及硅对上述指标的影响。结果表明：在盐分胁迫下，其植物体钠离子浓度升高，钙元素含量降低，其它元素含量变化不明显。叶片硅元素含量随盐胁迫而增加。同时，当盐分浓度由0 mmol·L-1升至120 mmol·L-1浓度时，盐腺对各种离子的分泌作用表现为先加强（60 mmol·L-1）后降低（120 mmol·L-1）的趋势；其叶及根可溶性蛋白变化不明显，但过氧化物酶活性随盐胁迫而升高；可溶性蛋白含量叶片高于根部，而过氧化物酶活性根部高于叶片。同时盐胁迫对小獐毛根部及叶片含水量无明显影响。通过细胞化学定位结果显示, 小獐毛叶表富含硅元素，硅元素在叶表排列沿叶脉方向呈线性分布；在其叶片盐腺上，硅元素分布于帽细胞顶部，在此过氧化物酶（POD）活性也较强。元素分析结果显示，小獐毛体内富积硅元素。在较低的NaCl(60 mmol·L-1)浓度下,施用硅处理可减少叶片钠离子浓度，使地上部对钾、钠元素的相对选择性明显提高。在较高盐浓度（120 mmol·L-1NaCl）下，加硅对叶片钠离子浓度的降低作用效果不明显。在盐胁迫下，加硅未能减少根中钠离子浓度，但可明显增加叶片POD活性。实验结果表明，盐生植物小獐毛可通过维持体内含水量，调节植物体内元素分布以及增加POD活性适应一定程度的盐胁迫。同时低盐条件下施硅处理小獐毛根系培养环境可通过减少盐分向地上部的运输，增加叶片清除自由基的能力从而提高植物抗盐性。
The changes of ionic absorption, secretion and the activity of POD on Aeluropus pungens under salinity conditions and the effects of silicon nutrition on those indices were studied using light microscopy, cytochemical localization, and quantitative and qualitative analysis for ions and physiological indices. The results were as follows: Under salinity conditions, the Na+ content increased and the Ca2+ content of the plant tissues decreased, while the other ions remained constant, and the concentrations of silicon in leaves increased with increasing salinity. The rate of ion secretion increased between 0 and 60 mmol·L-1 NaCl, and then declined when the NaCl concentrations in the roots reached 120 mmol·L-1. The content of soluble protein was unaffected but the POD activity was enhanced by the salt treatment. The amount of soluble proteins were higher in the roots than that in the leaves, while on the POD activity, the situation was the contrast. The water content did not change within 120 mmol·L-1 NaCl. The cytochemical location of Si distribution and POD activity techniques showed silica was distributed in rows along the leaf veins on the leaf surfaces, and some traces on the papillaes. On the salt glands Si accumulated on the top of the cap cell where the strong POD activi ty was found. By analyzing the elements, it was found that silicon tended to accumulate on the tissues of Aeluropus pungens. The Na content and the selective of Na, K of the shoots, which was not affected under 120 mmol·L-1 NaCl, was reduced under 60 mmol·L-1 NaCl by the addition of 3 mmol·L-1 Na 2SiO3. However, the Na content remained unaffected in the roots by the addition of Silicon to both salt concentrations. The above experiments demonstrated that halophyte Aeluropus pungens adapted to salinity conditions by adjusting water conditions, the ion distribution and POD activity on the plant tissues. The capacity of salt tolerance was improved, which was due to the inhibition of the Na transport from roots to shoots and the increasing abilities of antioxidative defense when silicon was added to the nutrient solutions.