Comparing the effects of excess copper in the leaves of Brassica juncea (L. Czern) and Brassica napus (L.) seedlings: Growth inhibition, oxidative stress and photosynthetic damage

摘要: Hydroponic experiments were conducted to compare the effects of excess copper (Cu) on growth and photosynthesis in young Indian mustard (Brassica juncea) oilseed rape napus). We compared Cu two Brassica species at different physiological levels from antioxidant photosynthetic activity. Nine-day-old plants treated with (10, 25 50 μM CuSO4) for 7 14 days. Both took up external solution a similar degree but showed slight root-to-shoot translocation. Furthermore, after seven days treatment, significantly decreased other microelement content, such as iron (Fe) manganese (Mn), especially shoots B. napus. As consequence, leaves napus concentrations pigments more intense inhibition; however, accumulation highly reactive oxygen (hROS) not detected. After exposure reduction Fe Mn contents shoot proved be comparable species. Moreover, significant Cu-induced hROS was observed both The diminution pigment efficiency pronounced during prolonged exposure. Based all parameters, juncea appears resistant than napus, rendering it higher potential phytoremediation.