Toxic effects of Pb2+ on growth of cowpea (Vigna unguiculata)

被引：140
|
作者：
Kopittke, Peter M. [1 ,2 ]
Asher, Colin J. [1 ]
Kopittke, Rosemary A. [3 ]
Menzies, Neal W. [1 ,2 ]
机构：
[1] Univ Queensland, Sch Land Crop & Food Sci, St Lucia, Qld 4072, Australia
[2] Univ Queensland, CRC Contaminat Assessment & Remediat Environm, St Lucia, Qld 4072, Australia
[3] Dept Primary Ind & Fisheries, Indooroopilly, Qld 4068, Australia
来源：
ENVIRONMENTAL POLLUTION | 2007年 / 150卷 / 02期
关键词：
activity; distribution; Pb; root growth; symptoms;
D O I：
10.1016/j.envpol.2007.01.011
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A concentration as low as 1 mu M lead (Pb) is highly toxic to plants, but previous studies have typically related plant growth to the total amount of Pb added to a solution. In the present experiment, the relative fresh mass of cowpea (Vigna unguiculata) was reduced by 10% at a Pb2+ activity of 0.2 mu M for the shoots and at a Pb2+ activity of 0.06 mu M for the roots. The primary site of Pb2+ toxicity was the root, causing severe reductions in root growth, loss of apical dominance (shown by an increase in branching per unit root length), the formation of localized swellings behind the root tips (due to the initiation of lateral roots), and the bending of some root tips. In the root, Pb was found to accumulate primarily within the cell walls and intercellular spaces. (C) 2007 Elsevier Ltd. All rights reserved.
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页码：280 / 287
页数：8
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