Garnett Trevor P, Graham Robin D
Department of Plant and Pest Science, University of Adelaide, Waite Campus, Glen Osmond, South Australia 5064, Australia.
Ann Bot. 2005 Apr;95(5):817-26. doi: 10.1093/aob/mci085. Epub 2005 Feb 8.
The amount of iron (Fe) and copper (Cu) that is loaded into grains of wheat (Triticum aestivum) depends on both the amount of nutrient taken up by the plant post-anthesis and the amount that is remobilized from vegetative organs as they senesce. Previous reports have shown that these two micronutrients behave quite differently in wheat in that Cu is readily remobilized to the grain whilst Fe shows poor remobilization. The object was to quantify the distribution of Fe and Cu in wheat and to show how this distribution changes from anthesis to grain maturity.
The uptake and distribution of both Fe and Cu were investigated in wheat grown at two levels, adequate and low, of both micronutrients. Plants were grown in sand culture and the main culms were harvested at anthesis, 18 days post-anthesis and at maturity. Plants were separated into various organs and analysed for Fe and Cu using ICP-OES.
There was good remobilization of Fe from the rest of the shoot to the grain with 77 % of the total shoot Fe in the grain at maturity. In the adequate-Cu treatment there was 62 % of the total plant Cu in the grain at maturity, whereas in the low-Cu treatment this was only 40 %. There was no net Fe taken up into the above-ground plant parts post-anthesis whilst for Cu there was. The remobilization evident for Fe and Cu was greater than that found for zinc and much greater than evident for manganese in the same material.
The results reported here represent good evidence for the high reproductive mobility of both Fe and Cu in wheat.
小麦（普通小麦）籽粒中铁（Fe）和铜（Cu）的积累量，既取决于开花后植株吸收的养分数量，也取决于衰老时从营养器官中再转运的养分数量。此前的报道表明，这两种微量营养素在小麦中的表现差异很大，铜很容易再转运到籽粒中，而铁的再转运能力较差。目的是量化铁和铜在小麦中的分布情况，并展示从开花到籽粒成熟期间这种分布是如何变化的。
在两种微量营养素水平（充足和低水平）下种植的小麦中，研究了铁和铜的吸收与分布情况。植株采用砂培法种植，在开花期、开花后18天和成熟期收获主茎。将植株分离为不同器官，使用电感耦合等离子体发射光谱仪（ICP - OES）分析铁和铜的含量。
铁从地上部其他部位向籽粒的再转运效果良好，成熟时籽粒中铁占地上部总铁量的77%。在铜充足的处理中，成熟时籽粒中铜占植株总铜量的62%，而在低铜处理中，这一比例仅为40%。开花后地上部植株部分没有净吸收铁，而铜有净吸收。在相同材料中，铁和铜明显的再转运程度高于锌，远高于锰。
此处报道的结果充分证明了铁和铜在小麦中具有较高的生殖迁移率。
