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Title: Effect of nickel on root growth and the kinetics of metal ions transport in onion (<i style="">Allium cepa</i>) root
Authors: Akbaş, Halide
Dane, Feruzan
Meriç, Çiler
Keywords: <i style="">Allium cepa </i>L
Atomic absorption spectrometry
Flame photometer
Phytotoxic effect
Issue Date: Aug-2009
Publisher: CSIR
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> The effect of different concentrations of nickel nitrate (0.25, 0.50, 1.00 and 2.00 m<i style="">M</i>) uptake by the roots<b style="">,</b> on root growth of onion (<i style="">Allium cepa</i>) and the transport of Ni<sup>2+</sup>, Fe<sup>2+</sup>, Mn<sup>2+</sup>, Zn<sup>2+</sup>, K<sup>+</sup>, Na<sup>+</sup> and H<sup>+</sup> ions were investigated spectrophotometrically. The uptake of Ni<sup>2+</sup>,<sup> </sup>Fe<sup>2+</sup>, Mn<sup>2+</sup> and Zn<sup>2+</sup> was monitored by flame atomic absorption spectrometry with a 24-h period for 7 days and the amounts of K<sup>+</sup> and Na<sup>+</sup> were determined in solutions by flame photometer. The mineral content of the solution, instead of the root material was measured. Ni<sup>2+</sup> ions showed inhibitory effect on the root growth at all concentrations during the entire treatment. The EC<sub>50 </sub>(effective concentration that reduced root growth by 50%) was found at 0.25 m<i style="">M</i> Ni<sup>2+</sup>. No significant change in inhibitory effect was observed after at 0.50 m<i style="">M</i><b style=""> </b>Ni<sup>2+ </sup>concentrations. A large amount of Ni<sup>2+</sup> was translocated into the roots. The kinetics of metal ion transport followed a pseudo-first order reaction in all metal ion concentrations. Ni<sup>2+</sup>, Zn<sup>2+ </sup>Fe<sup>2+ </sup>Mn<sup>2+</sup> and H<sup>+</sup> ions transferred together into plant, but Na<sup>+</sup> and K<sup>+</sup> ions transferred to the solution from the plant. The amount of H<sup>+</sup> in the solution decreased at all Ni<sup>2+ </sup>concentrations. </smarttagtype>
Description: 332-336
ISSN: 0975-0959 (Online); 0301-1208 (Print)
Appears in Collections:IJBB Vol.46(4) [August 2009]

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