Abstract
With the increasing popularity of urban landscaping, there is a greater need to address iron deficiency and chlorosis in Cinnamomum camphora. Beneficial microorganisms can play an important role in improving plant iron nutrition. In this study, we evaluated the greening effect that results from inoculating C. camphora with Rahnella aquatilis JZ-GX1. We conducted in vitro experiments to determine the effectiveness of JZ-GX1 in reducing extracellular iron(III) ions in siderophores and producing organic acids under low-iron conditions. Potted, chlorotic C. camphora seedlings were inoculated, and parameters related to growth and iron nutritional status were measured. Inoculation by JZ-GX1 had a more pronounced greening effect on C. camphora than the traditional iron sulfate treatment for plant iron deficiency. Inoculated plants exhibited higher levels of active iron in the leaves, enhanced rhizosphere acidification capacity and ferric chelate reductase activity. Furthermore, the complete root system and chloroplast developmental structures were observed. Our results demonstrate the potential roles of R. aquatilis JZ-GX1 in promoting iron absorption in C. camphora.
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