关键词: 玉米, 尿囊素, 土壤水分, 干湿交替, 磷吸收, 磷转运

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