黄瓜叶片对草酸铁的还原作用

铁还原作用在植物叶片对铁素吸收及利用过程中起关键作用.本研究表明相对于其它几种常用的铁螯合物如二乙基四乙酸铁(FeⅢEDTA)或柠檬酸铁,草酸铁更有利于黄瓜活体叶片及铁还原酶的作用,即表现出更高的铁还原活力.缺铁降低了黄瓜叶片中的铁还原活性.缺铁时叶片中的草酸含量不受影响,而富含在石灰性缺铁土壤中的碳酸氢根离子能使叶片中草酸含量显著提高.

Reduction of FerricOxalate by Cucumber Leaves

Ferric reduction may play an important role in iron acquisition and utilization for the cells of plant leaves. This study revealed that ferric oxalate could serve as a better substrate for the ferric reduction by either leaf discs or the membrane bound ferric reductase compared with the other commonly used ferric chelates such as Fe III EDTA and ferric citrate. Iron deficiency was not able to increase the ferric reduction in cucumber leaves, which usually occurs in the roots. Iron deficiency itself had no effect on oxalate content in the leaves, but bicarbonate, abundant in calcareous soil, significantly increased the leaf oxalate content.