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Title: Effects of nitrogen limitation in cyanobacterium, Westiellopsis iyengarii Jeejibai
Authors: Kannan, V
Issue Date: Oct-1999
Publisher: NISCAIR-CSIR, India
Abstract: Nitrogen limitation in cyanobacterium, W. iyengarii induced by flushing the cultures with a mixture of Ar-CO2 (99:1 v/v) resulted in drastic reduction in chlorophyll, carotenoid and phycocyanin pigments within 48 hr and this was accompanied by significant loss of photosynthetic activity. The reduction in pigment levels was in step with the break-down of cellular proteins (storage) including phycobiliproteins. However, heterocyst differentiation in Ar-flushed cultures was stimulated with a simultaneous increase in acetylene reduction activity (ARA). When chloramphenicol (CAM) was added to the Ar-flushed cultures, ARA was completely abolished, indicating a rapid turn-over of nitrogenase proteins. It is suggested that nitrogenase synthesis in newly developed heterocysts was necessary to maintain the level of ARA in cultures.
Page(s): 1027-1030
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.37(10) [October 1999]

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