Volume 2, Issue 2      April-June, 2014

Banashree Sarma, Prema Devi, Nirmali Gogoi,* Yendrembam Menaka Devi
Department of Environmental Science, Tezpur University, Napaam, Assam – 784028, India
This experiment was conducted with different concentrations of cobalt (100, 200, 300, 400 and 500 ppm) on wheat (Triticum aestivum L.) plants for quantification of its effects on growth performance in a sand culture medium using Hoagland solution. Germination was tested in petri dishes using same treatments. Inhibitory effect of Co on germination percent was observed from 200ppm of Co while vigor index decreased with increasing Co concentration. No negative effect of Co on germination index was found up to 300 ppm while beyond that higher percent inhibition of wheat seed germination was recorded. An enhancing effect on plant height, leaf number, leaf area and dry matter production was observed up to 200ppm of Co treatment while higher concentrations showed detrimental effect of the same. Chlorophyll a/b increased and chlorophyll stability index decreased with increasing Co concentration from 300 ppm onwards. Results from analysis of above ground plant biomass showed higher accumulation of Co with increasing concentration in the medium. However, at 100 ppm of Co treatment, significantly higher grain accumulation of Co was recorded compared to 500ppm of Co treatment. From these findings, it can be summarised that at lower concentrations (up to 200ppm) Co has an enhancing effect on growth of wheat crop and it has a good phyto-extracting ability for cobalt
Keywords: Cobalt, Wheat, Morphological parameters, Chlorophyll pigment, Plant accumulation
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