冬小麦灌浆期14C的同化、分配与调节

在盆栽条件下 ,利用氮肥和改变源库比的方法 ,研究了籽粒形成期 2个冬小麦品种的 14 CO2 同化及同化物的分配特征。结果表明 ,莱州 953的 CO2 同化能力显著高于鲁麦 14 ,但后者 14 C光合产物向籽粒中的分配比例较高 ,茎叶中残留比例较小。去穗 1/ 3以减少籽粒库容后 ,莱州 953的 14 C同化受影响较小 ,而鲁麦 14的 14 CO2 同化量则显著上升。开花期增施氮素能继续提高莱州 953的 CO2 同化能力 ,但不能有效地增加鲁麦14 CO2 同化能力。14 C同化及其调节特征的品种间差异 ,应在栽培措施上有所考虑

Assimilation and Allocation of 14C during Grain Formation Stage in Two Wheat Cultivars as Regulated by Nitrogen and Sink Removal

The assimilation and allocation of 14 C during grain filling stage in two wheat cultivars were investigated in pot experiment, as affected by nitrogen and sink removal. The results showed that the 14 CO 2 assimilation in Laizhou 953 was significantly higher than that in Lumai 14. However, the 14 C assimilates allocation percentage in grain in Lumai 14 was higher than that in Laizhou 953. When the ear sink was reduced by removing one third of the spikelets, the 14 C assimilation in flag leaf of Lumai 14 increased significantly while that of Laizhou 953 was little affected. On the contrary, the amount of 14 C assimilates in the flag leaf of Laizhou 953 increased with increasing N application but not for Lumai 14. It has been suggested that the genotypical difference of 14 C assimilation and its regulation should be considered in the practice of wheat management.