关键词: Zn, 玉米, 营养强化, 矿物元素

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