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Title: Iron mediated regulation of growth and siderophore production in a diazotrophic cyanobacterium <i style="">Anabaena cylindrica</i>
Authors: Raghuvanshi, Ruchika
Singh, Surendra
Bisen, Prakash Singh
Keywords: <i style="">Anabaena cylindrica</i>
Issue Date: Jun-2007
Publisher: CSIR
Abstract: Iron mediated regulation of growth and siderophore production has been studied in a diazotrophic cyanobacterium <i style="">Anabaena cylindrica</i>. Iron-starved cells of <i style="">A. cylindrica</i> exhibited reduced growth (30%) when the cells were growing under N<sub>2</sub>-fixing conditions. In contrast, NO<sub>3</sub><sup>-</sup>, NO<sub>2</sub><sup>-</sup>, NH<sub>4</sub><sup>+</sup> and urea grown cells exhibited almost 50% reduction in their growth in the absence of iron as compared to their respective counterparts cultured in the presence of iron. However, at 60 μ<i style="">M</i> of iron, <i style="">A. cylindrica </i>cells exhibited almost equal growth regardless of the nitrogen source available. Siderophore production in <i style="">A. cylindrica</i> was started after day 2<sup>nd</sup> of the cell growth and attained its optimal level on day 5<sup>th</sup> when the cells were at their mid-log phase. No siderophore<i style=""> </i>production was, however, recorded on day 2<sup>nd</sup> at all the concentrations of iron tested. The production of siderophore in <i style="">A. cylindrica</i> further increased with increase in iron concentration and attained its optimum level on day 5<sup>th</sup> at 60 μ<i style="">M</i> iron. <i style="">A. cylindrica</i> cells took at least 3 days for initiation of siderophore production and produced about 60% siderophore on day 5<sup>th</sup> even under iron-starved condition. <i style="">A. cylindrica</i> produced dihydroxamate type of siderophore.
Description: 563-567
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.45(06) [June 2007]

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