Abstract
Iron is critical for life and poses the living system with a number of challenges. Its low solubility in the environment is of major concern which tends to create problems during its acquisition and transport. Its rich redox chemistry that underlies many of iron’s essential biological functions has resulted in highly evolved mechanisms of iron transport in living system. Iron, although available in plenty in rhizospheric soil, is seldom in its bioavailable form at neutral and alkaline pH, hence there always prevails an “iron stressed” condition. Siderophore is the Greek phrase for “iron bearer” and is applied to molecules that can bind metal at very high affinity. One of the major mechanisms evolved for iron acquisition to combat the iron-stressed condition is synthesis of high-affinity siderophore-mediated iron transport systems. Two main components – siderophore production, and synthesis of membrane receptor molecules which mediate internalization of iron bound to siderophores – form part of this high-affinity transport system. Better exploration and exploitation of soil resources require increasing the efficiency of nutrient uptake by plants/microorganisms and decreasing nutrient augmentation in the soil from outside. Achieving this condition requires understanding of intimate processes and factors that govern nutrient availability to plants and microorganisms. The present chapter addresses this issue with special emphasis on siderophore-mediated iron acquisition system, the significance of iron–siderophore affinity in niche colonization by specific group of microorganisms, significance of possessing diverse ferri-siderophore uptake system and its impact in competitive survival of microorganisms in the rhizosphere, and how all these factors contribute to the plant growth.
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The authors thank students from their laboratory whose work has been cited in this chapter. The financial assistance provided by DBT, India and UGC, India to support the research is acknowledged.
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Desai, A., Archana, G. (2011). Role of Siderophores in Crop Improvement. In: Maheshwari, D. (eds) Bacteria in Agrobiology: Plant Nutrient Management. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21061-7_6
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