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Siderophore production in relation to N2 fixation and iron uptake in pigeon pea-Rhizobium symbiosis

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Thirty-one bradyrhizobial and rhizobial strains infecting pigeon pea were screened for siderophore production using Chrome Azurol S (CAS) agar plate as well as a CAS assay solution. Of a total of 31 strains only 23 showed siderophore production. Of the 23 siderophore-positive strains, 21 strains showed the production of hydroxamate while 6 strains showed the presence of catechol type of siderophore. A large variation in the quantity of hydroxamate and catechol produced by different rhizobial strains was observed (1.03–3.73 μg hydroxamate N per mg protein; 0.19–3.43 μmol/L of catechol per mg protein). Maximum nodule biomass was produced by strain PP-11 (CC-1020); strain G-14 formed minimum nodule biomass. Nitrogen contents of low, moderate and high siderophore-producing strains were 11.4, 15.4, 20.9 mg per plant, respectively, iron contents were 1445, 1768 and 2003 ppm, respectively. Siderophore production was related to N2-fixing efficiency.

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Duhan, J.S., Dudeja, S.S. & Khurana, A.L. Siderophore production in relation to N2 fixation and iron uptake in pigeon pea-Rhizobium symbiosis. Folia Microbiol 43, 421–426 (1998).

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