| 摘要: |
| 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 |
| 关键词: 冬小麦,~(14)C,氮,源/库 |
| DOI： |
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| 基金项目:国家自然科学基金!资助项目 (396 0 0 0 88) |
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| Assimilation and Allocation of 14 C during Grain Formation Stage in Two Wheat Cultivars as Regulated by Nitrogen and Sink Removal |
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| Abstract: |
| 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. |
| Key words: winter wheat,~(14) C,nitrogen,source/sink |
