Abstract
Iron metabolism in plants is essential to maintain optimal growth and iron nutrition is dependent on uptake of iron from the environment and movement of iron in the plant tissues. We have examined the translocation of iron in plant leaves following foliar application of FeEDTA to Vicia faba and Zea mays. Using radiolabeled iron, we observed that iron translocation is stimulated by products of Methylobacterium mesophylicum and by the cytokinin, kinetin. When cytokinins were applied to leaves along with 55FeEDTA, the rate of iron translocation was greater than in controls without cytokinin addition. Since recent studies indicate that M. mesophylicum is widely distributed in the environment as a pyllospheric bacterium, this organism may have an important role in enhancing translocation of nutrients in plant leaves.
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Acknowledgments
The authors are pleased to recognize the American Society of Plant Biologists, the Student Research Allocations of the Biology Department, and the Graduate Student Association of the University of New Mexico for financial support. We also wish to thank Mark A. Holland at Salisbury State University, Salisbury, Maryland for the newly isolated culture of Methylobacterium mesophylicum. We acknowledge Timothy J. Baker for his assistance in the radioassay measurements and Wei Lok Tsui for construction of the graphs.
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Bishop, Y.M., Barton, L.L. & Johnson, G.V. Influence of Methylobacterium on iron translocation in plants. Biometals 24, 575–580 (2011). https://doi.org/10.1007/s10534-011-9408-7
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DOI: https://doi.org/10.1007/s10534-011-9408-7