采用石英砂和营养液相结合的培养方法，对小麦CA9325进行去除部分小穗及在切口处涂萘乙酸（NAA）处理。结果表明，成熟期籽粒干物质和磷分配最多，旗叶最少。供磷处理中，除去1/3穗的各器官干重低于对照外，去1/4和1/5穗的各器官干重高于对照，各去穗处理的根干重、根/冠比、千粒重和籽粒磷均补偿性增加，去1/4穗的植株和籽粒重及磷含量最高。植株磷素吸收量与籽粒磷利用效率呈极显著线性负相关。NAA增加去穗处理的籽粒重及磷含量，说明NAA对小麦籽粒的建成、库的潜力、同化物和磷在体内的运输及向籽粒的积累有正调控作用。
A wheat (Triticum aestivum L.) cultivar CA9325 was cultured in quartz sand and nutrient solution with the treatments of P supplied all the time and P deficiency at flagging stage. At anthesis stage, plants were treated with removing partial spikelet and daubing NAA or not on the incision part. The results showed that at maturity, the dry weight and P content were the highest in grains and the lowest in flag leaves. In P supply treatments, dry weights of different organs were higher in CK than in those with 1/3 spikelets removal, and less than in those with 1/4 or 1/5 spikelets removal. Dry weight of roots, ratio of root to shoot, 1 000-grain weight and P content in all plants removed partial spikelets showed a compensatory increase. Grains and whole plant with 1/4 spikelets removal both had the highest dry weight and P content. This was a significantly negative correlation between P accumulation in the plant and P utilization efficiency in grains. In the removing partial spikelets treatments, dry weight and P accumulation in grains were higher in the combined treatments daubed by NAA than in those no NAA, indicating that NAA has a positive capacity to regulate and control grain construction, sink potential, assimilate and P transportation and distribution in plant and accumulation in grains.
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