不同钼效率冬小麦品种钼的吸收和分配

 在缺钼酸性黄棕壤上设不施钼（CK，土壤有效钼0.112 mg·kg-1）和施钼两个处理（+Mo，施钼0.13 mg·kg-1），研究钼高效冬小麦品种97003和钼低效冬小麦品种97014钼吸收和分配的差异。结果表明，不施钼时高效品种97003在整个生育期地上部干重和钼累积量均极显著高于97014，表明在相同缺钼逆境下97003吸收钼较多；97003拔节期上部叶、抽穗期穗、成熟期籽粒中分配的钼也多；穗和种子钼含量相对较高，表明97003向繁殖器官输送较多的钼。因而在缺钼逆境下97003对钼的利用效率较高，可获得较高产量。钼的吸收能力和利用能力较高可能是冬小麦品种97003钼高效的重要机理。

Molybdenum Efficiency in Winter Wheat Cultivars as Related to Molybdenum Uptake and Distribution

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.