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Differential toxicity of heavy metals to growth and nitrate reductase activity of Sesamum indicum seedlings


, : Differential toxicity of heavy metals to growth and nitrate reductase activity of Sesamum indicum seedlings. Phytochemistry (Oxford) 35(5): 1153-1156

The response observed for biomass accumulation in Sesamum indicum L cv PB-1 seedlings during early growth phase induced by 1.0 mM Ph-2+ supply in our earlier studies was not persistent when 1.0 mM Cu-2+ and Cd-2+ were supplied either alone or in the various combinations of Ph-2+, Cu-2+ and Cd-2+. Root and leaf fresh weights of the seedlings were hardly affected due to supply of 1.0 mM Ph-2+, whereas Cu-2+ and Cd-2+ caused a drastic decrease in the tissue fresh weight which was more pronounced in the roots. The dry weight of the roots showed a similar effect, however, leaf dry weight was increased with the metal supply. In vivo nitrate reductase activity (NRA, EC 1.6.6.1) was significantly inhibited in roots in the order Pb-2+ gt Cu-2+ gt Cd-2+. Leaf NRA was inhibited with Cu-2+ supply and with the combinations of the metals. The in vitro enzyme activity, on the other hand, was increased in most of the cases due to the metal supply. Further, total organic nitrogen of the young roots and in several cases in the leaves also increased with the metal supply, possibly because of increased translocation of nitrogen from seed to growing seedlings. The results show that growth and nitrate reduction of this cultivar of sesame respond differentially to Pb-2+, Cu-2+ and Cd-2+, and the effect was specific to the tissue examined.

US$19.90

DOI: 10.1016/s0031-9422(00)94812-x


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