Abstract: The differences of Mo uptake and distribution in Mo-efficient winter wheat cultivar 97003 and Mo-inefficient winter wheat cultivar 97014 were studied in two treatments. Molybdenum (Mo) was applied at the rate of 0(control) and 0.13 mg·kg-1 to an acid yellow-brown soil (soil available Mo 0.112 mg·kg-1). The results showed that the accumulation of Mo and dry matter in shoots of cultivar 97003 was significantly higher（P＜0.01） than in cultivar 97014 in the entire growth period in control. Cultivar 97003 also had a higher Mo accumulation rates in control than that of cultivar 97014, these disclosed that cultivar 97003 had a higher capacity of Mo accumulation under Mo deficiency. Furthermore Mo was distributed in the upper leaves at stem elongation stage, in spikes at heading stage, in seeds at maturity in cultivar 97003 than in cultivar 97014 under the conditions of Mo deficiency, and Mo concentration in spikes and in seeds of cultivar 97003 in control were found significantly higher than that of cultivar 97014, suggesting that a higher efficient use of Mo under Mo deficiency stress for cultivar 97003. The ability of Mo uptake and use were discussed and it was suggested to be the important physiological basis of Mo efficiency.

Key words: Molybdenum, Uptake, Distribution, Winter wheat cultivars, Molybdenum efficiency