Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/11394
Title: Response of multiple herbicide resistant strain of diazotrophic cyanobacterium, <i>Anabaena</i><i style=""> variabilis</i>, exposed to atrazine and DCMU
Authors: Singh, Surendra
Datta, Pallavi
Tirkey, Archna
Keywords: Atrazine
Cyanobacteria
DCMU
Herbicides
Mutants
Photosynthesis
Issue Date: Apr-2011
Publisher: NISCAIR-CSIR, India
Abstract: Effect of two photosynthetic inhibitor herbicides, atrazine (both purified and formulated) and [3-(3,4-dichlorophenyl)-1,1-dimethyl urea] (DCMU), on the growth, macromolecular contents, heterocyst frequency, photosynthetic O<sub>2</sub> evolution and dark O<sub>2</sub> uptake of wild type and multiple herbicide resistant (MHR) strain of diazotrophic cyanobacterium <i style="">A. variabilis</i> was studied. Cyanobacterial strains showed gradual inhibition in growth with increasing dosage of herbicides. Both wild type and MHR strain tolerated < 6.0 mg L<sup>-1</sup> of atrazine (purified), < 2.0 mg L<sup>-1</sup> of atrazine (formulated) and < 0.4 mg L<sup>-1</sup> of DCMU indicating similar level of herbicide tolerance. Atrazine (pure) (8.0 mg L<sup>-1</sup>) and 4.0 mg L<sup>-1 </sup>of atrazine (formulated) were growth inhibitory concentrations (lethal) for both wild type and MHR strain indicating formulated atrazine was more toxic than the purified form. Comparatively lower concentrations of DCMU were found to be lethal for wild type and MHR strain, respectively. Thus, between the two herbicides tested DCMU was more growth toxic than atrazine. At sublethal dosages of herbicides, photosynthetic O<sub>2</sub> evolution showed highest inhibition followed by chlorophyll <i style="">a</i>, phycobhiliproteins and heterocyst differentiation as compared to carotenoid, protein and respiratory O<sub>2</sub> uptake.
Description: 298-303
URI: http://hdl.handle.net/123456789/11394
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.49(04) [April 2011]

Files in This Item:
File Description SizeFormat 
IJEB 49(4) 298-303.pdf119.19 kBAdobe PDFView/Open


Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.