Variation in effects of four OP insecticides on photosynthetic pigment fluorescence of Chlorella vulgaris Beij

Study the effect of insecticide dimethoate on photosynthetic pigments and photosynthetic activity of pigeon pea: Laser-induced chlorophyll fluorescence spectroscopy

“…Inhibition of photosynthetic electron transport resulted in increased PSII fluorescence and reduced CO 2 fixation [7]. At the elevated concentration dimethoate modifies the photosystem fluorescence of green algae and cyanobacteria [5,12,13]. Dimethoate caused inhibition of thylakoid ATPase [7,8,13] which results in decreased thylakoid pH, which caused increased non-photochemical quenching, increased initial fluorescence, decreased maximum fluorescence and decrease in variable fluorescence [11][12][13].…”

“…electron transport [7,8]. Reports suggest that dimethoate negatively affects electron transport between PS II and PS I at the level of plastoquinone pool PQ [6,12]. Inhibition of photosynthetic electron transport resulted in increased PSII fluorescence and reduced CO 2 fixation [7].…”

“…At the elevated concentration dimethoate modifies the photosystem fluorescence of green algae and cyanobacteria [5,12,13]. Dimethoate caused inhibition of thylakoid ATPase [7,8,13] which results in decreased thylakoid pH, which caused increased non-photochemical quenching, increased initial fluorescence, decreased maximum fluorescence and decrease in variable fluorescence [11][12][13]. It also causes production and accumulation of reactive oxygen species (ROS) and increased activity of antioxidants such as catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) [14].…”

Cell size and the blockage of electron transfer in photosynthesis: Proposed endpoints for algal assays and its application to soil alga Chlorococcum infusionum

“…As we observed for C. infusionum, chlorophyll fluorescence transients and fluorescence parameters related to chlorophyll fluorescence transients alter in response to pollutants (Perron and Juneau, 2011;Jena et al, 2012;Nestler et al, 2012;Perron et al, 2012;Rodea-Palmaresa et al, 2012). Jena et al (2012) and Perron and Juneau (2011) reported a change in chlorophyll fluorescence transients and a few fluorescence parameters following treatment with 4 organophosphorus insecticides and 3 endocrine disrupters.…”

“…Jena et al (2012) and Perron and Juneau (2011) reported a change in chlorophyll fluorescence transients and a few fluorescence parameters following treatment with 4 organophosphorus insecticides and 3 endocrine disrupters. Quinalphos, chlorfenvinphos, dimethoate, and phorate caused a decrease in chlorophyll fluorescence transients and area for C. vulgaris (Jena et al, 2012). 4-Nonylphenol, 4-octylphenol and b-estradiol also cause a reduction in chlorophyll fluorescence transients, RC/ABS, ETo/RC, and RC/Dio for C. reinhardtii, while RC/ABS and ETo/RC treated with b-estradiol did not.…”