Phytate utilization of maize mediated by different nitrogen forms in a plant-arbuscular mycorrhizal fungus-phosphate-solubilizing bacterium system

作者：Ding, Xiaodong; Zhang, Lin; Zhang, Shirong; Feng, Gu^*

来源：Journal of Plant Interactions, 2014, 9(1): 514-520.

DOI：10.1080/17429145.2013.861028

• Funelliformis mosseae
• Pseudomonas alcaligenes M20
• organic P
• ammonium
• nitrate
• phosphatase activity

A pot experiment was conducted to investigate the organic phosphorus (P) (phytate) utilization of Zea mays L. with different nitrogen (N) forms (NH4 and NO3-) when both arbuscular mycorrhizal (AM) fungus (Funelliformis mosseae) and phosphate-solubilizing bacterium (PSB, Pseudomonas alcaligenes) are present. The soil was supplied with either KNO3 or (NH4)(2)SO4 (200 mg kg(-1) N) with or without phytin (75 mg P kg(-1)). Results showed that the application of NH4 to the soil in a plant-AM fungus-PSB system decreased rhizosphere pH and increased phosphatase activity. It also enhanced the mineralization rate of phytin, which resulted in the release of more inorganic P. The application of NO(3)(-)promoted mycorrhizal colonization and hyphal length density in the soil. The inorganic P in the hyphosphere decreased, but more P was transferred to the plant through the mycorrhizal hyphae. Hence, in addition, the application of the two different N forms did not significantly alter the content of plant P. The plant supplied with different N fertilizers acquired P through different mechanisms associated with other microbes. NH4 application promoted phytin mineralization by decreasing soil pH, whereas NO(3)(-)application increased inorganic P uptake by strengthening the mycorrhizal pathway.

• 出版日期2014
• 单位中国农业大学