|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Experimental Biology (IJEB) >
IJEB Vol.49 [2011] >
IJEB Vol.49(04) [April 2011] >
| Title: | Response of multiple herbicide resistant strain of diazotrophic cyanobacterium, Anabaena variabilis, 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 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. |
| Page(s): | 298-303 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1009 (Online); 0019-5189 (Print) |
| Source: | IJEB Vol.49(04) [April 2011]
|
|
