A Review of Heavy Metal Accumulation and Tolerance by Plants of Different Ecotype

Abstract

Abstract: Phytoremediation is now regarded as one of the most important techniques to clean soil of heavy metal contamination.It is a key for phytoremediation to select proper plants.Concept of species in taxonomy is not enough in identifying plants for ecological restoration.Rather,consideration must be taken at the level of ecotype.Plants of different ecotype often have large difference in accumulating and tolerating heavy metal,although they are classified as the same species in taxonomy.They could respond differently to variation of concentration,ion form,and interaction of heavy metals.Difference in accumulating heavy metals is mainly attributed to the difference of heavy metal transporter,detoxication and genetics.Difference in enduring heavy metals is due to the difference in genetics,enzyme system and sequestration in cell of different ecotypic plants,while phytochelatins (PC) is not a key factor.Plants of different ecotype are ideal materials in study of hyperaccumulation,toleration and detoxication of heavy metals.This paper introduces the concept,origination and classification of ecotype.It also reviews research progress in heavy metal accumulation and toleration of different ecotypic plants.

Key words: ecotype, phytoremediation, tolerant ecotype, sensitive ecotype

PENG Shao-Lin, DU Wei-Bing, LI Zhi-An. A Review of Heavy Metal Accumulation and Tolerance by Plants of Different Ecotype[J]. journal6, 2004, 25(4): 19-26.

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