Abstract
The patterns of molybdenum (MoO42−) absorption and transport were investigated in intact bean (Phaseolus vulgaris L.) and rice (Oryza sativa L. cv. I.R.8) plants. The mobility of MoO42− absorbed by roots and by leaves was compared with that of a freely mobile element, Rb+. Although MoO42− absorption by bean roots was nearly as high as that of Rb+, its transport to the shoot was considerably less. When MoO42− was fed to one of the primary leaves, most of it was transported to the stem and root. Evidence obtained here showed that MoO42− was mobile. Experiments with intact rice seedlings revealed large differences in the absorption and transport of MoO42− between the plants grown in CaSO4 and those in Hoagland solution. Molybdate uptake by excised rice roots was suggested to be an active process since it was greatly inhibited by a metabolic inhibitor. The presence of Mn2+, Zn2+, Cu2+, CI−, or SO42− in the absorption medium reduced MoO42− uptake which was markedly enhanced by the presence of Fe2+.
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Selected References
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