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本试验利用（１４）￣Ｃ示踪法研究了３个春小麦（ＴｒｉｔｉｃｕｍａｅｓｔｉｖｕｍＬ．）品种籽粒灌浆期旗叶同化物库端（穗）卸出的昼夜变化。研究表明，在籽粒灌浆期，旗叶（１４）￣Ｃ－同化物在库端（穗）卸出非常迅速，在标记后２４小时内，植株中５４％～７０％的（１４）Ｃ－同化物分布在穗部，尤其是穗中（１４）Ｃ－淀粉等贮藏性物质含量几乎呈直线上升。虽然如此，但是穗中（１４）￣Ｃ－可溶性同化物却出现积累或饱和状态，这说明库活性是有一定限度的，源（叶等）能为库提供充足的同化物。同一品种旗叶上午同化的（１４）Ｃ－同化物在穗中合成淀粉等的速率快于下午同化的。不论上午饲喂还是下午饲喂（１４）￣ＣＯ２，中８５０２、中８９０４穗部（１４）￣Ｃ－淀粉等含量在饲喂后２４小时内，总的来说均显著高于克７４－２０２，而其穗中（１４）￣Ｃ－可溶性同化物在标记１０小时后、２４小时内显著低子克７４－２０２，这说明它们穗中淀粉等合成速率快于克７４－２０２，故而表现出较强的库活性。收获指数与库活性相关。
In this study, daytime and nighttime changes of flag leaves assimilate pool (panicle) unloading during grain filling were studied by (14) ~ C tracing method. Studies showed that the flag leaf (14) C-assimilates were discharged very rapidly at the grain end (panicle) during grain filling and 54% -70% (14) C-assimilation in plants within 24 hours after labeling Distribution of substances in the panicle, especially in the ear (14) C-Starch and other storage substances increased almost linearly. Nevertheless, the accumulation or saturation of the (14) C-soluble isolates in the panicle indicates that there is a limit to the pool activity and that the source (leaf, etc.) provides sufficient assimilate for the pool. The assimilation of the (14) C-assimilate in the same variety of flag leaves in the ear resulted in faster rates of starch synthesis than in the afternoon. Regardless of morning feeding or afternoon feeding (14) ~ CO2, 8502, 8904 spike (14) ~ C-starch content within 24 hours after feeding, in general, were significantly higher than grams of 74-202 , Whereas the soluble (14) C-soluble isolates in their ears markedly reduced the number of sons from 74 to 202 within 24 hours after 10 hours of labeling, indicating that the rate of starch synthesis in their ears was faster than that of gram 74-202, Strong pool activity. Harvest index correlated with pool activity.