Studies on Molybdenum Absorption and Transport in Bean and Rice

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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 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+, Cl-, or SO42- in the absorption medium reduced MoO42- uptake which was markedly enhanced by the presence of Fe2+.