Siderophores (Greek: "iron carrier") are small, high-affinity iron-chelating compounds secreted by microorganisms such as bacteria, fungi and grasses. Siderophores are amongst the strongest soluble Fe 3+ binding agents known.There are three main kinds of siderophores known as hydroxamate, catecholate and carboxylate. Such siderphores , how do they regulate soil fertility and plant nutrition via changes in soil biology , is the central theme of whole discussion. Using this as a basis , i propose following  questions to be responded by my learned colleagues:

* What determines the nature and properties of siderophores ?

* Whether or not, nature and properties  of siderophores vary as per soil microbial communities ?

* Do we have some efficient siderphores producing microbial isolates to be later used in other crops of choice ?

* Whether or not , other than iron binding siderophores are known ?

* Whether or not , siderophores add any added advantages to rhizosphere biology/ecology ?

* How do siderophores aid in availability , transformation and uptake of nutrients other than iron  ?

* Whether or not , mechanisms involved in siderophores functioning , are different in grasses versus bacteria /fungi ?

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