4种藤本植物对锰污染土壤的耐受性及其生理响应
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国家科技部十二五科技支撑计划(2013BA001B06);大学生创新创业训练计划(201310534008)


Tolerance and Physiological Response of Four Lianas to Soil Manganese Contamination
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    摘要:

    为筛选对Mn污染土壤具有较高耐受性的藤本植物并探讨其抗Mn生理机制,以薜荔、忍冬、五叶地锦和络石扦插苗为材料,采用模拟Mn污染土壤培养法,配置Mn含量分别为3 000 mg/kg(T1)、6 000 mg/kg(T2)、9 000 mg/kg(T3)和12 000 mg/kg(T4)的Mn污染土壤,以不加Mn的土壤为空白对照(CK),研究不同浓度Mn胁迫对4种藤本植物生物量、生长量、不同部位Mn含量、叶绿素含量、丙二醛(MDA)含量及超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性的影响,并对其耐性指数(Ti)、转移系数(TF)、生物富集系数(BCF)进行了比较分析。结果表明:(1)随着Mn处理浓度的升高,薜荔、五叶地锦、忍冬、络石的生物量、生长量总体呈现下降的趋势,平均耐性指数依次分别为82.48%、84.86%、89.21%和95.41%。(2)地上部分、根系的Mn含量随着Mn处理浓度的增加总体呈现升高的趋势,且根系的Mn含量都高于地上部分,TF值均小于1,地上部分和根系的BCF平均值均依次为:络石>忍冬>五叶地锦>薜荔。(3)随土壤Mn处理浓度的升高植物叶绿素含量总体呈现下降的趋势,MDA含量持续上升,而SOD活性、POD活性、CAT活性呈先升后降的趋势,在T4处理时络石的叶绿素含量和三种抗氧化酶活性下降幅度、MDA上升幅度均低于其他3种植物。研究表明,络石较其他3种植物具有更高的Mn耐受性以及Mn转移能力和富集能力,可作为Mn尾矿污染土壤修复的潜力植物。

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    To select lianas with high tolerance to Mn polluted soil and further study its physiological mechanisms on Mn resistance,We studied Ficus pumila,Lonicera japonica,Parthenocissus quinquefolia,Trachelospermum jasminoides in soil containing 3 000 mg/kg (T1),6 000 mg/kg (T2),9 000 mg/kg(T3) and 12 000 mg/kg (T4) Mn,with the soil was not added Mn as the control.The effects of different concentrations of Mn stress on biomass,mass growth,different parts of the Mn content,chlorophy content,malondialdehyde (MDA) content,the activities of superoxide dismutase (SOD),peroxidase (POD) and catalase (CAT) in four lianas were studied,and their tolerance indexes (Ti),translocation factors (TF),bio-concentration factors (BCF) were analyzed.The results are as follows:(1) With the increase of Mn concentration in soil, the biomass and mass growth mostly were declined,average tolerance index of F.pumila,P.quinquefolia,L.japonica and T.jasminoides was 82.48%,84.86%,89.21% and 95.41%,respectively; (2) The general trend of Mn content in aboveground parts and roots were increased with the increase of Mn concentrations in soil,and the Mn content in roots were always higher than that in aboveground parts ,the TF values were less than 1 and the average BCF of aboveground parts and roots from high to low were as follows:T.jasminoides>L.japonicaP.quinquefolia> Ficus pumila; (3) Chlorophy content was mostly decreased with the increase of Mn concentration in soil,MDA content was continuously increased,and the activities of SOD,POD,CAT were firstly increased and then decreased.Chlorophy content and three antioxidant enzymes activities decrease as well as MDA content increase of T.jasminoides were the lowest among four lianas when treated with T4.The study revealed that Mn tolerance,transfer and accumulation abilities of T.jasminoides were the highest in four lianas,suggesting it is potential use in Mn tailings soil bioremediation.

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汪结明,王良桂,韩改改.4种藤本植物对锰污染土壤的耐受性及其生理响应[J].西北植物学报,2015,35(8):1604-1611

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  • 在线发布日期: 2015-08-29
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