Photosynthetic organisms and excess of metals

被引:121
作者
Bertrand, M [1 ]
Poirier, I [1 ]
机构
[1] CNAM, Inst Marine Sci & Tech, EA 3202, F-50103 Cherbourg, France
关键词
chloroplast; oxidative stress; photosynthesis; thylakoid membrane; xanthophyll cycle;
D O I
10.1007/s11099-005-0058-2
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
When cells get metals in small excess, mechanisms of avoidance occur, such as exclusion, sequestration, or compartmentation. When the excess reaches sub-lethal concentrations, the oxidative stress, that toxic metals trigger, leads to persistent active oxygen species. Biomolecules are then destroyed and metabolism is highly disturbed. At the chloroplast level, changes in pigment content and lipid peroxidation are observed. The disorganized thylakoids impair the photosynthetic efficiency. The Calvin cycle is also less efficient and the photosynthetic organism grows slowly. When an essential metal is given together with a harmful one, the damages are less severe than with the toxic element alone. Combined metals and phytochelatins may act against metal toxicity.
引用
收藏
页码:345 / 353
页数:9
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