Response of multiple herbicide resistant strain of diazotrophic cyanobacterium, Anabaena variabilis, exposed to atrazine and DCMU.

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dc.contributor.authorSingh, Surendra
dc.contributor.authorDatta, Pallavi
dc.contributor.authorTirkey, Archna
dc.date.accessioned2013-02-14T09:52:15Z
dc.date.available2013-02-14T09:52:15Z
dc.date.issued2011-04
dc.description.abstractEffect 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 O2 evolution and dark O2 uptake of wild type and multiple herbicide resistant (MHR) strain of diazotrophic cyanobacterium A. variabilis 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-1 of atrazine (purified), < 2.0 mg L-1 of atrazine (formulated) and < 0.4 mg L-1 of DCMU indicating similar level of herbicide tolerance. Atrazine (pure) (8.0 mg L-1) and 4.0 mg L-1 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 O2 evolution showed highest inhibition followed by chlorophyll a, phycobhiliproteins and heterocyst differentiation as compared to carotenoid, protein and respiratory O2 uptake.en_US
dc.identifier.citationSingh Surendra, Datta Pallavi, Tirkey Archna. Response of multiple herbicide resistant strain of diazotrophic cyanobacterium, Anabaena variabilis, exposed to atrazine and DCMU. Indian Journal of Experimental Biology. 2011 Apr; 49(4): 298-303.en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/145129
dc.language.isoenen_US
dc.source.urihttps://nopr.niscair.res.in/handle/123456789/11394en_US
dc.subjectAtrazineen_US
dc.subjectCyanobacteriaen_US
dc.subjectDCMUen_US
dc.subjectHerbicidesen_US
dc.subjectMutantsen_US
dc.subjectPhotosynthesisen_US
dc.titleResponse of multiple herbicide resistant strain of diazotrophic cyanobacterium, Anabaena variabilis, exposed to atrazine and DCMU.en_US
dc.typeArticleen_US
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