研究论文
陈国祥,施国新,何兵,解凯彬,陆长梅,常福辰,魏锦城.Hg、Cd对莼菜越冬芽光合膜光化学活性及多肽组分的影响[J].环境科学学报,1999,19(5):521-525
Hg、Cd对莼菜越冬芽光合膜光化学活性及多肽组分的影响
- Effect of mercury and cadmium on photochemical activity and polypeptide compositions of photosynthetic membranes from winter bud of Brasenia schreberi
- 基金项目：国家自然科学基金
- 作者
- 单位
- 陈国祥
- 南京师范大学生物系,南京 210097
- 施国新
- 南京师范大学生物系,南京 210097
- 何兵
- 南京师范大学生物系,南京 210097
- 解凯彬
- 南京师范大学生物系,南京 210097
- 陆长梅
- 南京师范大学生物系,南京 210097
- 常福辰
- 南京师范大学生物系,南京 210097
- 魏锦城
- 南京师范大学生物系,南京 210097
- 摘要：研究了重金属Hg2+、Cd2+对水生植物莼菜越冬芽光合膜叶绿素含量、多肽组分及光化学特性的影响。实验结果表明,经1mmol/L浓度Hg2+处理后,叶片光合膜叶绿素含量、叶绿素a/b值、室温吸收光谱、荧光发射光谱、光系统电子传递活性呈下降趋势；当Hg2+处理浓度超过2mmol/L时,叶片光合膜叶绿素含量及其它光化学活性显著下降,光合膜多肽组分也产生降解。茎光合膜对Hg2+的敏感程度比叶片低。莼菜越冬芽经不同浓度Cd2+(2、5、10mmol/L)处理后,其光合膜叶绿素含量、光化学活性也产生相应变化,但程度较Hg2+处理弱；同样,其叶片光合膜对2+的敏感程度较茎强
- Abstract：The effects of Hg2+ and Cd2+on chlorophyll contents, chlorophyll a/b values, absorption spectra, fluorescence emission spectra at room temperature, electron transport activity of photosystem and polypeptides compositions of thylakoid membrane from winter bud of hydrophyte Brasenia schreberi were investigated. The results showed that the chlorophyll content and photochemical activity decreased progressively with an increasing in concentrations of Hg2+ and Cd2+. The effects of Hg2+ and Cd2+on the chlorophyll content and photochemical activity of thylakoid from leaves decreased obviously and the thylakoid membrane polypeptide compositions was defraded. It was also shown that toxic effects of Hg2+ on Brasenia schreberi winter bud was more significannt than that of Cd2+.
- Key words：mercury cadmium Brasenia schreberi winter bud photosynthetic membrane chlorophyll content photochemical activity polypeptide composition
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