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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Toxic effects of low concentrations of Cu on nodulation of cowpea (Vigna unguiculata).

Although Cu is phytotoxic at Cu(2+) activities as low as 1-2 microM, the effect of Cu(2+) on the nodulation of legumes has received little attention. The effect of Cu(2+) on nodulation of cowpea (Vigna unguiculata (L.) Walp. cv. Caloona) was examined in a dilute solution culture system utilising a cation exchange resin to buffer solution Cu(2+). The nodulation process was more sensitive to increasing Cu(2+) activities than both shoot and root growth; whilst a Cu(2+) activity of 1.0 microM corresponded to a 10% reduction in the relative yield of the shoots and roots, a Cu(2+) activity of 0.2 microM corresponded to a 10% reduction in nodulation. This reduction in nodulation with increasing Cu(2+) activity was associated with an inhibition of root hair formation in treatments containing > or =0.77 microM Cu(2+), rather than to a reduction in the size of the Rhizobium population.[1]


  1. Toxic effects of low concentrations of Cu on nodulation of cowpea (Vigna unguiculata). Kopittke, P.M., Dart, P.J., Menzies, N.W. Environ. Pollut. (2007) [Pubmed]
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