The uptake of Mn from manganous ions (Mn-ions) and pyrolusite (MnO2) by three week-old oat plants (Avena sativa L.) grown in nutrient solutions controlled at pH values between 6 and 8, was almost completely inhibited by suspensions of Mn- oxidizing bacteria over a three day uptake period.
‘Grey speck’ symptoms of Mn deficiency developed in oats grown for 10 days with Mn bacteria in a nutrient solution that had received 1 ppm Mn ions and was controlled at pH 6.3. Rape plants (Brassica napus L.) absorbed appreciable amounts of Mn from treatments similar to those that inhibited Mn uptake by oats.
Treatments which decreased or prevented biological oxidation of Mn ions favoured the uptake of Mn by oats from Mn ions, MnO2 and bacterial Mn-oxide. Acid conditions (pH 5.0) always increased Mn uptake. This was due in part to inhibition of bacterial oxidation and to an increase in the ability of the plants to obtain Mn from Mn oxides.
Uptake of Mn is explained on the basis of the rates of two opposing processes; the rate of release of Mn from oxides and the rate of biological oxidation of Mn ions. The results are discussed in relation to the availability of Mn in soils.
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Bromfield, S.M. The effect of manganese-oxidizing bacteria and pH on the availability of manganous ions and manganese oxides to oats in nutrient solutions. Plant Soil 49, 23–39 (1978). https://doi.org/10.1007/BF02149905
- Nutrient Solution
- Acid Condition
- Manganese Oxide