Abstract: Zinc is an essential trace mineral element in living body and plays an important role in the growth and development of plant, animal and human body. In order to increase zinc content in corn grain, this experiment took 102 corn germplasm resources as materials and analyzed the zinc contents in corn kernel. The results showed that the variation range of zinc contents in 102 corn germplasm was 8.42~33.7 mg/kg, with an average of 19.61 mg/kg, and the variation coefficient was 28.45％, indicating obvious diversity of zinc content in corn germplasm. In order to further analyze the relationship between zinc content and zinc uptake efficiency, 2 lines were picked out with remarkable differences in zinc contents and sprayed zinc fertilizer on their leaves. The results showed that zinc contents of corn grain in Jingke 2010 (JK2010) and Jingke 928 (JK928) were significantly increased by 87.5% and 135%, respectively. The zinc content in JK2010 grain was increased with the raising of zinc spraying concentration, whereas the zinc content in JK928 with low zinc content was not affected by the spraying zinc concentration and iron. Iron could promote zinc absorption in JK2010 line. It was also discovered that spraying zinc fertilizer could affect the absorption of some other mineral elements.

Key words: zinc, corn, nutrient enrichment, mineral element

摘要： 锌（Zn）是生物体必需的微量元素，在动植物和人体的生长发育中具有重要作用。为了提高玉米籽粒中Zn的含量，以102份玉米种质资源为材料，对玉米籽粒中的Zn含量进行分析，发现102份玉米籽粒Zn含量的变异范围为8.42～33.7 mg/kg，平均含量为19.61 mg/kg，变异系数为28.45％，表明玉米种质资源中的Zn含量具有明显的多样性。为了进一步分析籽粒Zn含量与Zn吸收效率之间的关系，从102份材料中挑出含Zn量差异显著的2个材料叶面喷施Zn肥，结果表明叶面喷施Zn肥均能显著的提高京科糯2010（JK2010）和京科糯928（JK928）籽粒中Zn的含量，分别提高了87.5%和135%；富Zn JK2010株系的籽粒Zn含量随着喷施Zn浓度的增加而提高，且Fe对Zn的吸收具有促进作用；低Zn的JK928株系籽粒Zn含量不受喷施Zn浓度和Fe的影响，同时也发现Zn肥的施用对其他一些矿物元素的吸收也有影响。

关键词: Zn, 玉米, 营养强化, 矿物元素