Abstract
Seed germination was delayed and seedling growth inhibited by 0.04 to 1.9 mM Pb+2 in Sesamum indicum L. var HT-I. In root, shoot and leaf Pb+2 accumulation increased with increasing Pb+2 concentration in the nutrient solution. In root and leaf tissues in vivo and in vitro nitrate reductase activity was inhibited significantly which was well correlated with the concentration of Pb+2 supplied and its accumulation in the plant parts. The inhibition of the NR enzyme activity could be, however, reversed by simultaneous treatment of Sesamum seedlings with K2HPO4, CaCl2 and KNO3 dissolved in nutrient solution. Total organic N and soluble protein of roots and shoots/leaves, on the other hand, increased with increasing concentration of Pb+2 while the same treatment caused a decrease in the N content of cotyledons. It appears therefore, that the increase in N and protein in the roots, shoots/leaves may be a result of increased translocation of N from the cotyledons to the roots and shoots/leaves during early seedling growth in a Pb+2 enriched environment.
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Kumar, G., Singh, R.P. & Sushila Nitrate assimilation and biomass production in Sesamum indicuml. Seedlings in a lead enriched environment. Water Air Soil Pollut 66, 163–171 (1993). https://doi.org/10.1007/BF00477067
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DOI: https://doi.org/10.1007/BF00477067