摘要
在不同Pb2+质量浓度(0、25、50、100、200 mg/L)的人工条件下,利用叶绿素荧光动力学技术研究比较了狭叶扭口藓(Barbula subcontorta Broth.)和地钱(Marchantia polymorpha L.)的叶绿素荧光特性。结果表明:(1)总体上,随着Pb2+浓度的增加,狭叶扭口藓和地钱的最大光化学量子产量(Fv/Fm)、最大荧光产量(Fm)、本底荧光产量(Ft)、光下初始荧光产量(Fo’)、光下最大荧光产量(Fm’)、光化学猝灭系数(qP)、光化学量子效率(ΦPSⅡ)呈下降趋势;初始荧光产量(Fo)呈升高趋势;非光化学猝灭系数(NPQ)和最大表观光合电子传递速率(ETRmax)呈先升高后降低趋势。(2)地钱对环境中Pb2+的耐受能力强于狭叶扭口藓,表观现象和叶绿素荧光参数的变化说明,狭叶扭口藓仅能耐受50 mg/L的Pb2+污染,而地钱可以耐受100 mg/L的Pb2+污染。用叶绿素荧光参数可以说明狭叶扭口藓和地钱对环境中的Pb2+的耐受机制,也可以作为鉴定和判断苔藓植物抗污染的快速方法。地钱可用来修复土壤中的Pb2+污染,而狭叶扭口藓可以用作土壤中Pb2+污染的指示和监测植物。
The chlorophyll fluorescence characteristics of Barbula subcontorta Broth.and Marchantia polymorpha L.under different Pb2+concentrations of 0,25,50,100,200 mg/L were menstruated by using the chlorophyll fluorescence measuring technique.The results showed that maximum photochemical efficiency(Fv/Fm),maximum fluorescence(Fm),background fluorescence(Ft),initial fluorescence in the light-adapted state(Fo'),maximum fluorescence in the light-adapted state(Fm'),photochemical quenching coefficient(qP),effective quantum yield of photosystemⅡ(ΦPSⅡ) of the two bryophyte species were decreased and the initial fluorescence(Fo) was increased with increasing the Pb2+concentrations,while for non-photochemical quenching coefficient(NPQ) and maximum apparent electron transport rates(ETRmax),they both increased first and then decreased rapidly.The maximum Pb2+ tolerance concentrations of Barbula subcontorta Broth.and Marchantia polymorpha L.were 50,100 mg/L respectively.The Pb2+ tolerance mechanism of the two bryophyte species showed that Marchantia polymorpha L.can be applied to restore the Pb2+ polluted soils while Barbula subcontorta Broth.could be used as indicator or monitor of Pb pollution in soils.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2011年第1期36-40,共5页
Environmental Pollution & Control
基金
云南省基础研究重点项目(No.2009CC003)
教育部高等理工教育教学改革与实践项目(No.239)
国家基础科学人才培养科学基金资助项目(No.J0730652)
云南大学生命科学实验教学示范中心创新实验项目
关键词
叶绿素荧光
PB2+
狭叶扭口藓
地钱
chlorophyll fluorescence
Pb2+
Barbula subcontorta Broth.
Marchantia polymorpha L.