Abstract: In order to study the effect of allantoin on the uptake and transport of phosphorus in maize under soil moisture dry and wet alternation，under potted conditions，four treatments were set up which included continuous irrigation control（T1），continuous irrigation+allantoin（T2），soil moisture dry and wet alternation control（T3），and soil moisture dry and wet alternation+allantoin（T4），and the phosphorus uptake，distribution，and transport status of various organs in maize was studied. The results showed that，at the maize mature stage the T4 treatment phosphorus uptake of roots，stems，leaves，and grains was 15.94%，43.73%，21.73%，27.78% higher than T3 treatment，and T2 was 26.83%，12.74%，3.93%，8.97% higher than T1，respectively；the total phosphorus uptake of T4 was 22.18% higher than T3，and T2 was 9.13% higher than T1；the proportion of phosphorus distribution in the root of T2 was significantly increased compared to T1，while T4 increased the proportion of phosphorus distribution in the stem and grain compared to T3；the efficiency of phosphorus dry matter production of T4 was 1.37% lower than T3，and the efficiency of phosphorus seed production of T4 was 0. 46% higher than T3；the phosphorus transport capacity，transport rate，and transport contribution rate of T4 was 83.58%，39.69%，43.93% higher than T3，allantoin could not significantly affect the phosphorus uptake post flowering of corn under two soil moisture conditions，but it significantly reduced the contribution rate of phosphorus uptake post flowering to grains under soil moisture dry wet alternation；T4 significantly increased maize yield by 22.64% and reduced bald tip length by 16.11% compared with T3.Comprehensive analysis suggests that allantoin can significantly enhances the phosphorus uptake and transport capacity of maize under soil moisture dry and wet alteration conditions.

Key words: Maize, Allantoin, Soil moisture, Dry wet alternation, Phosphorus uptake, Phosphorus transport

摘要： 为研究尿囊素对土壤水分干湿交替下玉米磷吸收与转运的影响，在盆栽条件下，设置连续浇灌对照（T1）、连续浇灌+尿囊素（T2）、土壤水分干湿交替对照（T3）、土壤水分干湿交替+尿囊素（T4）4个处理，研究玉米各器官磷吸收、分配和转运状况。结果表明，玉米成熟期，T4处理根系、茎、叶、籽粒磷吸收量分别较T3 处理提高了15.94%、43.73%、21.73%、27.78%，T2 分别较T1 提高了26.83%、12.74%、3.93%、8.97%；T4总磷吸收量较T3提高了22.18%，T2较T1提高了9.13%；T2与T1相比显著提高了磷在根系内分配比例，T4与T3相比提高了磷在茎和籽粒内分配比例；T4与T3相比降低磷干物质生产效率1.37%，提高磷籽粒生产效率0.46%；T4 磷转运量、转运率和转运贡献率分别较T3 提高了83.58%、39.69%、43.93%，尿囊素不会对2种土壤水分条件下玉米花后磷吸收量产生显著影响，但会显著降低土壤水分干湿交替下花后磷吸收量对籽粒的贡献率；T4 与T3 相比显著提高玉米产量22.64%，降低秃尖长度16.11%。综合分析认为，尿囊素会显著提高土壤水分干湿交替条件下玉米磷吸收与转运能力。

关键词: 玉米, 尿囊素, 土壤水分, 干湿交替, 磷吸收, 磷转运