Phosphorus Affected Organic Acid Exudation from Soybean Root

To study the effect of phosphorus on organic acid exudation of soybean root,the phosphorus level changed from 0 to 50 μM and 50 to 0 μM in nutrient solution was carried out.The low-molecular-weight organic acids in root exudates of soybean were determined by high performance liquid chromatography under nutrient solution culture.The dynamics of low-molecular-weight organic acids under different root region were investigated.The influence of P-deficiency on soluble phosphorus content was analyzed.The results showed that the soluble phosphorus content of root in 50-0 treatment was relative higher,while that of shoot in 0-50 treatment was relative higher.Otherwise,organic acid exudation from 50-0 treatment soybean root was larger than 0-50 treatment.The amount of organic acid exudation from soybean root was reduced as far away root tip.The trend of decrease in 50-0 treatment was more slowly than 0-50 treatment.