单一重金属污染对水稻叶片光合特性的影响  

Effects of Individual Heavy Metals on Photosynthetic Characteristics in Rice Leaves

作　　者：王泽港[1] 骆剑峰[1] 刘冲[1] 葛才林[1] 罗时石[1] 马飞[1] 

机构地区：[1]扬州大学农学院,江苏扬州225009

出　　处：《上海环境科学》2004年第6期240-243,共4页Shanghai Environmental Sciences

基　　金：国家自然科学基金;编号 30300026

摘　　要：以杂交稻协优818为材料,研究了Cu^(2+)、Hg^(2+)、Cd^(2+)3种重金属离子对水稻叶片光合特性的影响。试验结果表明:(1)Cu^(2+)在低浓度时引起叶片叶绿素含量降低,而Hg^(2+)、Cd^(2+)在低浓度时,则导致叶绿素含量增加;高浓度时,3种重金属均引起叶绿素含量降低。同时,低浓度时3种重金属离子均导致叶绿素a/b值升高;高浓度时则均引起叶绿素a/b值下降。(2)Cu^(2+)、Hg^(2+)、Cd^(2+)对水稻叶片叶绿素的吸收光谱均无明显影响,在活体条件下并未发生卟啉环中Mg^(2+)的置换。(3)Cu^(2+)、Hg^(2+)、Cd^(2+)均引起叶片希尔反应活力降低,即重金属污染明显影响光合作用。Abstract Effects of individual three heavy metal ions（Cu^2＋, Hg^2＋ and Cd^2＋） on the photosynthetic characteristics in leaves of hybrid rice Xieyou 818 were studied. The results suggested that： （1） under lower concentration, Cu^2＋ ion constituent led the content of chlorophyll in the leaves to decrease, but Hg^2＋ or Cd^2＋ did on the contrary; meanwhile under higher concentration, any of those three heavy metal ions led the content of chlorophyll to decrease; the ratio of chlorophyll a to chlorophyll b rose under lower concentration of any of those three heavy metal ions whilst decreasing under higher concentration; （2） any of those three heavy metal ions had little effect on the absorbing spectrum of chlorophyll, and no displacement of Mg^2＋ in the porphyrin ring took place in vivo; （3） any of those three heavy metal ions gave rise to a descent of the activities of Hill reaction in the rice leaves, i.e., heavy metals affected photosynthesis significantly.

关 键 词：重金属 水稻 光合特性 

分 类 号：X53[环境科学与工程—环境工程] S513.01[农业科学—作物学]