I am going to be looking in to the significance of this and would appreciate
any more information that is out there. It could be, of course, that any
relationship between vanadium levels and phosphorus availability/uptake
could just be due to soil type difference and it just happens that the soil
types that have lower P availability also have high vanadium levels.
Vanadium is associated with ores and it is likely that high vanadium soils
may be higher in aluminium and iron than other soils (iron and aluminium as
well as potentially vanadium causing problems with P availability). I
imagine that this has already been checked out to some extent.
If it is established that vanadium is a significant problem I would be
interested in how to test for it (probably a nitric/perchloric digest to get
a total level?) and how to reduce its effects (e.g. liming?).
Dale mentioned vitamin C being oxidised by vanadate. This is likely to be a
vice versa thing in that excess vanadium levels can be controlled by vitamin
C. The trick would then be to produce plants with as high levels of vitamin
C and other antioxidants as possible - in other words produce high quality
plants and vanadium problems could be limited.
P.O. Box 558
>I was curious so I searched for info on vanadium toxicity. I didn't find
>anything in the literature suggesting that this is an important problem,
>I did find out about the mechanism of toxicity. It does mimic phosphate,
>inhibiting plasmamembrane ATPase, and so inhibits active transport of PO4
>and everything else. Vanadium (V) also oxidizes ascorbate producing free
>radicals and associated membrane damage. If you want the 8 abstracts I
>found, let me know.
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