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铜对紫背浮萍的影响
李红敬;谢素霞;李天煜
1.信阳师范学院生物系;2.武汉大学环境科学系 河南信阳 464000;3.河南信阳 464000;4.湖北武昌 430072
摘要:
利用紫萍(Spirodela polyrhiza)作材料,在实验室条件下研究了增加铜对紫萍生长、光合作用色素含量、叶绿素a荧光的产生和植物体内铜累积的影响。结果表明,环境中增加1μmol L-1d的Cu2+时即可显著地抑制紫萍的生长(用鲜重和干重表示),随增加的铜的量加大,对生长的抑制作用增加,鲜重在8 μmol L-1Cu2+时,干重在2 μmol L-1 Cu2+以上时出现负增长;铜水平的升高可使叶绿素含量大幅下降,但对类胡萝卜素的含量影响不大;对叶绿素a荧光的产生也有影响,短时间的处理(24 h内)使Fo和Fm升高,但Fv/Fm变化很小,随着处理时间的延长和处理浓度的增加,Fo和Fm下降...
关键词:  紫萍    铜    叶绿素a荧光    色素含量    毒性评价    植物修复
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