Response of rice crop inoculated with arbuscular mycorrhizal fungi and plant growth promoting rhizobacteria to different soil nitrogen concentrations

摘要

AMF (arbuscular mycorrhizal fungi) is widely distributed in agro-ecosystems (Smith and Read 1997), forming symbiotic associations with the roots of plants. They play an important role in plant mineral nutrition and plant health (Barea, Azcon, and Azcon-Aquilar 2002; Ferrol, Barea, and Azcon-Aquilar 2002; Giovannetti, Sbrana, and Avio 2002). These fungi have a wide range of application in sustainable low input agricultural systems (Schreiner and Bethlenfalvay 1995). The use of AMF may contribute to reducing chemical fertilizer inputs and sustaining plant productivity in agriculture (Me Gonigle 1988). In natural soils in the presence of indigenous fungi, introduced isolates differ in their ability to stimulate plant growth (Medina, Sylvia, and Kretschmer 1988).