油菜对Cs胁迫的响应及其对Cs富集规律的研究

Accumulation and physio-biochemical responses of Brassia campestris L. to Cs stress

以油菜为受试植物,采用盆栽法将其置于植物管理系统中进行培育,90 d后测定不同浓度Cs水平下油菜的生理生化指标和各个器官的Cs富集量,分析油菜对土壤Cs的胁迫响应及富集规律。结果表明:低浓度的Cs(≤100 mg·kg^(-1))对油菜的生长发育有促进作用,使株高、生物量、叶绿素含量、POD活性都有所增加,表明油菜对Cs有一定的抗胁迫机制;但随着土壤中Cs浓度的升高,这种协调机制被打破,油菜生长受到抑制,株高、生物量、叶绿素含量、POD活性都呈现下降趋势。此外,随着土壤中Cs浓度的提高,油菜的Cs富集量也增大。当土壤中Cs浓度≤100 mg·kg^(-1)时,富集情况为茎部>叶片>根系;当100 mg·kg^(-1)<土壤中Cs浓度≤600mg·kg^(-1)时,富集情况为叶片>茎部>根系,表明油菜具有良好的Cs转运能力和富集能力,其在Cs污染土壤修复方面具有一定的应用潜能。

Herein we planted Brassia campestris L. in a plant management system via the potting method. After 90 days, we examined the physiological indices of Brassia campestris L. and the enrichment of each organ under different Cs stresses in order to discuss the response and accumulations. Our results showed that low Cs concentrations（Cs ≤ 100 mg·kg-1） had certain promotional effects on plant height, biomass, chlorophyll content, and POD activity, thus Brossia campestris L. had certain stress resistance. However, increasing Cs concentra- tions caused a decline in height, biomass, chlorophyll content, and POD activity. The adjustment mechanism was broken, and plant growth was inhibited. With an increase of Cs content in the soil, the accumulation in every organ also increased. In addition, Brassia campestris L. presented the following accumulation order： stem 〉 leaf 〉 root at Cs·100 mg·kg-1 in the soil and stem 〉 leaf 〉 root at 100 mg·kg-1· Cs· 600 mg·kg-1 in the soil. These findings indicated that Brassia campestris L. had strong transportation capacity and great potential for phy- toremediation of Cs polluted soils.