I know Mn2+ is stable and bio-available for plants, but what if only Mn4+ is available for plants in the environment? Is there any way that plants can transform Mn4+ into Mn2+? or Plants can utilize Mn4+ as they are? Thank you!
This has been well answered on this other question page.
https://www.researchgate.net/post/Manganese_is_absorbed_from_soil_in_which_form_by_the_plants
Dear Yuqing Ye
Mn4+ is insoluble (inert) in soil and plants cannot utilize it. Plants cannot transform it but environmental factors can transform it into Mn2+ and then plants can utilize. Factors like, good soil aeration and neutral or alkaline pH usually favours the prevalence of Mn4+. However when the soil is humid or waterlogged and soil oxygen is poor, Mn4+ is reduced to Mn2+.
My dear
You can use the available resources in the field of soil fertility to logically explain your topic
Soil Fertility and Fertilizers: An Introduction to Nutrient Management 7th Edition
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