| 摘要: |
| 应用^14C示踪活体动力学和离体测量方法，探讨小麦旗叶碳同化产物在不同土壤水分条件下的运输分配情况和化学调控的影响。结果表明：灌浆期旗叶同化物活跃输出时间为饲喂后1.5d内，^14C同化物输出百分率随饲喂后时间的变化动态，在灌浆前期可拟合为对数方程，而灌浆后期可拟合为直线方程。土壤欠水处理加快了灌浆后期同化物输出，影响同化物在植株各部位的分配比例，其中向根系的分配明显增加。系统化控缓和了欠水的影响，显著缩短了^14C同化物输出半时，促进了同化物输出。 |
| 关键词: 土壤水分 小麦 灌浆期 旗叶碳同化物 化学调控 同化物运转 运输分配 |
| DOI： |
| 修订日期：2001-11-13 |
| 基金项目: |
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| Effect of Soil Water and Chemical Regulation on Exportation and Partitioning of 14C-Assimilates of Wheat Flag Leaf During Filling Stage |
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| Abstract: |
| Photosynthetic matter transportation and partitioning of wheat flag leaf were studied. The wheat plants were exposing to different soil water and under HK6 (a new PGR) regulation condition during grain filling stages using in vivo dynamic method and in vitro determination 14 CO 2 technique. The results showed that active period of 14 C assimilates transportation out of the wheat flag leaf is within 1.5 days when they are formed and the assimilates' dynamic transportation and distribution were different in respond to various treatments. During determination period, the output rate of assimilate followed a logistic curve in the prophase of filling stages, while a linear pattern of output happened in the anaphase. Deficit water treatment caused the curve more fluctuating, fastened the transportation of 14 C and impacted the partitioning rate of assimilates within different parts of plant, favoring the supply to root; systemically chemical control was helpful to export and partition for assimilates and shortened the half time of 14 C assimilates transporting, especially in late grain filling stage, can alleviate the adverse impacts caused by water shortage in the anaphase of kernel filling. |
| Key words: winter wheat,soil water,chemical regulation,assimilate transportation and partition |
