Journal
PLANT AND SOIL
Volume 292, Issue 1-2, Pages 283-289Publisher
SPRINGER
DOI: 10.1007/s11104-007-9226-4
Keywords
Ni2+; nickel phytotoxicity; shoot and root growth; symptoms
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Despite the importance of Ni-polluted soils throughout the world, comparatively little is known about the activity of Ni2+ required to reduce plant growth and the effects that Ni2+ toxicity has on the plant. Cowpea (Vigna unguiculata (L.) Walp. cv Caloona) was grown in dilute nutrient solutions to investigate the effect of Ni2+ activity on shoot and root growth. A Ni2+ activity of 1.4 mu M was found to cause a 10% reduction in the relative fresh mass of the root and shoots. The primary site of Ni2+ toxicity was the shoots, with the younger leaves displaying an interveinal chlorosis (possibly a Ni-induced Fe deficiency) at Ni2+ activities N1.7 mu M. Lateral root formation was inhibited in the two highest Ni2+ treatments (3.3 and 5.1 mu M), and the roots growing at the highest Ni2+ activity were short and stubby and brown in color. However, no other symptoms of toxicity were observed on the roots at lower Ni2+ activities.
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