Toxicological impact of anilofos on some physiological processes of a rice field cyanobacterium<i>Anabaena torulosa</i>

Singh, Devinder; Khattar, Jasvirinder Singh; Kaur, Kanwaldeep; Sandhu, B.S.; Singh, Yadvinder

doi:10.1080/02772248.2012.703203

Cited by 13 publications

(16 citation statements)

References 43 publications

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“…Treatment with bentazone (2 mM) for 72 h decreased total phycobiliproteins content of Anabaena cylindrica by 58% whereas molinate at highest tested concentration (2 mM) completely suppressed phycobiliproteins after 24 h treatment [29]. Anilofos inhibited all photosynthetic pigments of Anabaena torulosa [46] and Oscillatoria simplicissima [33]. Herbicides such as 3-(3,4-dichlorophenyl)-1,1-dimethyl urea (DCMU), 2-tert-butylamino-4-ethylamino-6-methylthio-1,3,5-triazine (terbutryn) and 4-hydroxy-3,5-diiodobenzonitrile (ioxynil) have been shown to inhibit PSII of photosynthetic organisms [53]–[56].…”

Section: Resultsmentioning

confidence: 97%

“…On day 12, the microorganism exhibited 61, 44 and 25% growth as compared to control cultures in 5, 10 and 20 mg L −1 of anilofos, respectively. Growth inhibition by anilofos in Anabaena torulosa [46], butachlor, bensulfuron-methyl in Nostoc sp. [47], [48], glyphosate in Anabaena sp., Leptolyngbya boryana, Nostoc punctiforme, and Microcystis aeruginosa [31], [49], and, molinate and bentazon in Anabaena cylindrica and Nostoc muscorum [29], [50], [51] has recently been reported.…”

Section: Resultsmentioning

confidence: 99%

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Anilofos Tolerance and Its Mineralization by the Cyanobacterium Synechocystis sp. Strain PUPCCC 64

et al. 2013

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This study deals with anilofos tolerance and its mineralization by the common rice field cyanobacterium Synechocystis sp. strain PUPCCC 64. The organism tolerated anilofos up to 25 mg L−1. The herbicide caused inhibitory effects on photosynthetic pigments of the test organism in a dose-dependent manner. The organism exhibited 60, 89, 96, 85 and 79% decrease in chlorophyll a, carotenoids, phycocyanin, allophycocyanin and phycoerythrin, respectively, in 20 mg L−1 anilofos on day six. Activities of superoxide dismutase, catalase and peroxidase increased by 1.04 to 1.80 times over control cultures in presence of 20 mg L−1 anilofos. Glutathione content decreased by 26% while proline content was unaffected by 20 mg L−1 anilofos. The test organism showed intracellular uptake and metabolized the herbicide. Uptake of herbicide by test organism was fast during initial six hours followed by slow uptake until 120 hours. The organism exhibited maximum anilofos removal at 100 mg protein L−1, pH 8.0 and 30°C. Its growth in phosphate deficient basal medium in the presence of anilofos (2.5 mg L−1) indicated that herbicide was used by the strain PUPCCC 64 as a source of phosphate.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Anilofos Tolerance and Its Mineralization by the Cyanobacterium Synechocystis sp. Strain PUPCCC 64

et al. 2013

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“…This decrease may be correlated with the less enzymatic reduction of nitrate/nitrite within the cells or slow ammonium uptake rather than the direct toxic effects of pretilachlor on the enzyme glutamine synthetase. The decrease in GS activity by other pesticides in cyanobacteria has been reported (Bhunia et al 1994;Jha and Mishra 2005;Singh et al 2012). The kinetic studies on GS revealed decreased V max and unchanged K m in the presence of pretilachlor indicating non-competitive interaction of pretilachlor with GS in this cyanobacterium.…”

Section: Discussionmentioning

confidence: 89%

“…The tolerance level of microorganisms towards herbicides depends upon the species, nature and mode of herbicide action. Growth inhibition in other cyanobacteria by herbicides has been reported such as by anilofos in Anabaena torulosa (Singh et al 2012) and Synechocystis (Singh et al 2013), by butachlor, bensulfuron-methyl in Nostoc sp. (Chen et al 2007;Dowidar et al 2010), glyphosate in Anabaena sp., Leptolyngbya boryana, Nostoc punctiforme, and Microcystis aeruginosa (López-Rodas et al 2007;Forlani et al 2008), and by molinate and bentazon in Anabaena cylindrica and Nostoc muscorum (Galhano et al 2010b(Galhano et al , 2011.…”

Section: Discussionmentioning

confidence: 98%

“…(Leganés and Fernández-Valiente 1992;Okmen and Ugur 2011;Okmen et al 2013), bentazon and molinate on Nostoc muscorum and Anabaena cylindrica (Galhano et al 2010a, b), paraquat on Anabaena oryzae and Nostoc ellipsosporum (Pandey et al 2011) and anilofos on Anabaena torulosa, Synechocystis sp. PUPCCC 64 and Oscillatoria simplicissima (Singh and Sandhu 2010;Singh et al 2012Singh et al , 2013 have been studied. Many herbicides whose effects on cyanobacteria have been studied earlier are either banned or their use has been discontinued.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pretilachlor on nitrogen uptake and assimilation by the cyanobacterium Desmonostoc muscorum PUPCCC 405.10

et al. 2015

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Tolerance limit, kinetics of nitrogen uptake and activity of nitrate reductase (NR), nitrite reductase (NiR) and glutamine synthetase (GS) enzymes of cyanobacterium Desmonostoc muscorum PUPCCC 405.10 were studied under the regime of chloroacetanilide herbicide pretilachlor. The organism was isolated from the paddy field under application of the herbicide and tolerated pretilachlor up to 10 ppm under laboratory conditions. The incubation of the cyanobacterium in 2.5 ppm pretilachlor did not cause significant effect on N uptake while supplementation of 5-10 ppm pretilachlor in medium reduced the rate of nitrate and nitrite uptake by 35-73 % with 50 % decrease in V max and no change in K m . These results indicated that herbicide did not affect the affinity of uptake system to nitrate and nitrite. In presence of herbicide, the activity of nitrogen assimilation enzymes was inhibited by 16 % for NR and 18 % for NiR. Unchanged K m and decreased V max (50-60 %) in presence of herbicide indicated non-competitive-type inhibition of the enzymes. A 50 % decrease in V max and K m of ammonium uptake indicated un-competitive type inhibition of the ammonium transport system by the herbicide. GS activity also exhibited non-competitive inhibition in presence of pretilachlor with 21 % decrease in activity with unchanged K m and 40 % decrease in V max . Likewise, decreases in nitrogenase activity by 43 % and heterocyst formation by 40 % were recorded in presence of herbicide. Results indicated that pretilachlor affected nitrogen assimilation at uptake level and interacted with nitrogen-assimilating enzymes in a non-competitive manner.

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Interaction of pretilachlor with PS‐II activity of the cyanobacterium Desmonostoc muscorum PUPCCC 405.10

et al. 2020

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Interaction of pretilachlor with photosystem (PS)‐II of the cyanobacterium Desmonostoc muscorum PUPCCC 405.10 has been studied in this paper. Pretilachlor negatively affected growth, chlorophyll a (Chl a), photosynthesis, and carbon dissimilation in a dose‐dependent manner. Effects were also observed in PSs, especially PS‐II (an 11–35% decrease), as well as the whole photosynthetic electron transport activity. The fluorescence emission spectrum of Chl a revealed a dose‐dependent effect of pretilachlor on both the antenna and the core complex of PSs, with more severe effect on the former. Data of O‐J‐I‐P fluorescence transient of Chl a revealed that pretilachlor interfered with electron flow between QA and QB sites of PS‐II. It was further observed that pretilachlor decreased maximum fluorescence, variable and relative variable fluorescence, maximum quantum yield, quantum yield of electron transport, the rate of trapped exciton movement, quantum yield of electron transfer, and performance index of primary photochemistry; however, there was a progressive increase in the net rate of PS‐II closure, quantum yield of energy dissipation, and effective antenna size per active reaction center. A decrease in photosynthetic activity leads to a decrease in carbon dissimilation, as evidenced by low activity of glucose‐6‐phosphate dehydrogenase and pyruvate kinase. Thus, pretilachlor, which is otherwise known to kill weeds by interfering with cell division, affected the growth of the cyanobacteria by interacting with PS‐II.

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Toxicological impact of anilofos on some physiological processes of a rice field cyanobacteriumAnabaena torulosa

Cited by 13 publications

References 43 publications

Anilofos Tolerance and Its Mineralization by the Cyanobacterium Synechocystis sp. Strain PUPCCC 64

Anilofos Tolerance and Its Mineralization by the Cyanobacterium Synechocystis sp. Strain PUPCCC 64

Effect of pretilachlor on nitrogen uptake and assimilation by the cyanobacterium Desmonostoc muscorum PUPCCC 405.10

Interaction of pretilachlor with PS‐II activity of the cyanobacterium Desmonostoc muscorum PUPCCC 405.10

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