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Studies on Molybdenum Absorption and Transport in Bean and Rice

Biology and Agriculture Division, Bhabha Atomic Research Centre, Bombay 400 085, India

The patterns of molybdenum (MoO₄^2–) absorption and transport were investigated in intact bean (Phaseolus vulgaris L.) and rice (Oryza sativa L. cv. I.R.8) plants. The mobility of MoO₄^2– absorbed by roots and by leaves was compared with that of a freely mobile element, Rb⁺. Although MoO₄^2– absorption by bean roots was nearly as high as that of Rb⁺, its transport to the shoot was considerably less. When MoO₄^2– was fed to one of the primary leaves, most of it was transported to the stem and root. Evidence obtained here showed that MoO₄^2– was mobile. Experiments with intact rice seedlings revealed large differences in the absorption and transport of MoO₄^2– 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 SO₄^2– in the absorption medium reduced MoO₄^2– uptake which was markedly enhanced by the presence of Fe²⁺.

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