Hi,
In an experiment I found that increasing iron concentration from 4 micro molar to 20 micro molar led to increase of Zn and Mn in the plants root and leaf. Do you know how does iron help to Zn and Mn absorption?
Best
Probably due to the increase in the expression or activity in the non-specific metal transporter families IRT, ZIP and/or NRAMP in root
Due to the similar physicochemical properties and shared absorptive pathways, zinc (Zn) and manganese (Mn) may interfere with iron absorption. For example, the influence of zinc (Zn) on Fe status may be in relation to their competition for metal transporters.
There has some related research work may be helpful for you to explain your experimental results. Please refer to:
Article Response of Wheat Plants to Zinc, Iron, and Manganese Applic...
Article Competitive inhibition of iron absorption by manganese and z...
Article Interactions of iron with manganese, zinc, chromium, and sel...
So far I found Zn interferes with the translocation of Fe. Zn inhibit the reducing capacity of iron (Fe3+ to Fe2+) by root. (Soyabean). ( doi: 10.1104/pp.46.2.320 )