摘要
本文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,供应铵态氮有利于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,初生叶中该比值变化不明显,说明初生叶对新叶铁营养状况起着重要的调节作用。
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.
出处
《核农学报》
CAS
CSCD
1998年第5期293-298,共6页
Journal of Nuclear Agricultural Sciences
基金
国家攀登计划项目
关键词
分根培养
氮素形态
铁
再利用效率
玉米
Split root nutrient solution, nitrogen form, iron reutilization efficiency, corn