铁营养状况及不同形态氮素对玉米体内铁再利用效率影响的研究

本采用分根营养液培养方法，用＾５９Ｆｅ示踪技术研究了铁及不同形态氮素对玉米苗期体内铁再利用的影响。结果表明，缺铁促进了铁向地上部的运输，体内铁再利用率提高。与硝态氮相比，供庆铵态氮有利提高体内铁的再利用率，玉米新叶＾５９Ｆｅ含量比硝态氮处理的高９个百分点，改善了玉米新叶铁的营养状况。在缺铁条件下，供应铵态氮时、初生叶中＾５９Ｆｅ含量占地上部比例由５０％降至２５％，而供应硝态氮时，初生叶中该比值变

EFFECTS OF IRON AND DIFFERENT NITROGEN FORM ON IRON REUTILIZATION EFFICIENCY IN MAIZE PLANTS

Effects of iron and different nitrogen forms on iron reutilization in maize plants were studied in split root nutrient solution system by using isotopic technique.The results showed that the translocation of iron to shoot was enhanced under iron deficiency.Compared with NO 3 N,NH 4 N supply was favourable in the Fe reutilization in maize plants, 59 Fe content in new leaves is more than that in NO 3 N treatment.Compared with Fe supply,the propotion of Fe in primary leaves to that in whole shoot decreased from 50% to 25% under Fe stress condition by NH 4 N supply, however, feeding NO 3 N could not change this percentage,indicating that primary leaves play an important role in Fe nutrient status in young leaves.