RELATIONSHIP BETWEEN HEAVY-METAL ACCUMULATION AND TOXICITY IN SPIRODELA-POLYRHIZA (L) SCHLEID AND AZOLLA-PINNATA R BR

被引：31

作者：

GAUR, JP

NORAHO, N

CHAUHAN, YS

机构：

[1] SCI COLL,DEPT BOT,KOHIMA 797002,INDIA

[2] NE HILL UNIV,DEPT BOT,SHILLONG 793014,MEGHALAYA,INDIA

来源：

AQUATIC BOTANY | 1994年 / 49卷 / 2-3期

关键词：

D O I：

10.1016/0304-3770(94)90037-X

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The accumulation of Cd, Cr, Co, Cu, Ni, Pb and Zn by Spirodela polyrhiza (L.) Schleid. and Azolla pinnata R. Br. was directly related to the concentration of metals in the medium during a 4 day exposure period. The hierarchy of metal accumulation was Ni > Zn > Co > Cu > Cd > Pb > Cr in S. polyrhiza and Ni> Zn > Co = Cd > Cu > Pb > Cr in A. pinnata. All metals inhibited relative growth rates of test plants in a concentration-dependent manner. Depending on metal concentration in the medium, the hierarchy of metal toxicity was Cd > Cu = Ni > Co > Cr > Zn > Pb for S. polyrhiza and Cd > Cr > Co > Cu > Ni > Pb > Zn for A. pinnata. The present work showed that the sulphur affinity hypothesis cannot be applied to explain variabilities in toxicities of test metals. When toxicity was evaluated in terms of metal concentration in plants the hierarchy of metal toxicity was Cr > Cd > Cu > Co > Ni > Pb > Zn for S. polyrhiza and Cr > Cd > Cu > Co > Pb > Zn > Ni for A. pinnata.

引用

页码：183 / 192

页数：10

共 31 条

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