Abstract:

In order to understand the effect of the different nitrogen sources on Cu uptake, accumulation and growth of Elsholtzia splendens, nutrient solution culture experiment was conducted to compare two nitrogen sources (NH4NO3 and (NH4)2SO4) on growth of E.splendens at three different Cu levels (Control, 50, and 200 uM). The result showed that the influence of two nitrogen sources on shoot and root growth of E.splendens decreased in the order: NH4NO3>(NH4)2SO4. In particular, root dry matter yields of E.splendens increased especially by two nitrogen sources treatment even at high Cu (200 ?mol/L), but increased levels of NH4NO3 than (NH4)2SO4 treatment. Moreover, nitrogen sources had different effects on Cu uptake and accumulation by E.splendens, Plants grown with NH4NO3 treatment had significantly higher Cu accumulation in the shoots and roots as compared with (NH4)2SO4 treatment. Two kinds of nitrogen suppy, along with raising the level of Cu, the Cu content of E.splendens increase, but the root of the Cu content is much higher than the shoot of the content. Whatever the level of Cu, the Cu content in root /shoot ratio (R/S) were NH4NO3>(NH4)2SO4.