Coupling Effects of Moisture and Phosphorus on Root Morphology and Phosphorus Cycling of High-Starch Maize Inbred Line

Zhang Hui; Mu Chunhua; Sun Yanling; Xu Lihua; Chen Yu; Zhai Xuexu; Li Zongxin; Wang Qingcheng; Liu Xia

doi:10.14083/j.issn.1001-4942.2016.01.018

Abstract：Using maize inbred lines 12SG188 (high starch content) and 99038 (low starch content) as study materials, the influences of phosphorus and water on the morphology of root system and phosphorus ab-sorption and distribution inside plants of maize inbred lines were studied with quartz sand potting method.The results showed that, within the growth period, the plant root system number, total leaf area, dry matter accu-mulation and phosphorus absorption efficiency of high-starch maize inbred line 12 SG188 were all higher than those of low-starch maize inbred line 99038.Regardless of being under water stress or not, with the increase of the amount of phosphorus supply, the total plant leaf area and the amount of dry matter accumulation in the two maize inbred lines both significantly increased, whereas water stress had greater influence on dry matter accumulation in 99038 than that in 12SG188.In 12SG188, the increase of the total amount of phosphorus ac-cumulation under low-phosphorus water stress treatment was higher than that under low-phosphorus normal water treatment, and was higher than that in 99038 under low-phosphorus water stress treatment.In 99038, the increase of the total amount of phosphorus accumulation under high-phosphorus normal water treatment was higher than that under high-phosphorus water stress treatment, and was higher than that in 12SG188 un-der high-phosphorus normal water treatment.Thus, 12SG188 maize inbred line had higher phosphorus ab-sorption efficiency than 99038, and was more resistant to low phosphorus and draught than 99038.12SG188 had the highest amounts of total phosphorus transport in xylem sap and phosphorus recirculation in phloem un-der high-phosphorus normal water condition, while 99038 had the lowest amounts of total phosphorus trans-port in xylem and phloem under low-phosphorus water stress condition.