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Changes in Proline Content Accompanying the Uptake of Zinc and Copper by Lemna minor

RAMAN BASSI and SHANTI S. SHARMA
Annals of Botany
Vol. 72, No. 2 (August 1993), pp. 151-154
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42759335
Page Count: 4
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Changes in Proline Content Accompanying the Uptake of Zinc and Copper by Lemna minor
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Abstract

Lemna minor L. grown in Hoagland solution containing zinc (10 ppm) or copper (5 ppm) for 4 d accumulated high levels of these metals. Zinc and Cu accumulation in the test plants was accompanied by a specific pattern of change in proline content. The latter showed a steep rise during early stages (peak at 12 24 h) followed by a gradual decline until 96 h of treatment. In a dose-response study, lower metal concentrations induced a sharp rise in proline level with a maximum value at 5 ppm, which declined when the concentration was further enhanced. There was a correspondence between the level of proline and total free amino acids in metal treated plants. The possibility of proline involvement in tolerance mechanisms to heavy metals has been discussed.

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