Relationship between the degree of carotenoid depletion and function of the photosynthetic apparatus

Dankov, Kolyo; Busheva, Mira; Stefanov, D.; Аpostolova, Emilia

doi:10.1016/j.jphotobiol.2009.04.004

Cited by 35 publications

(22 citation statements)

References 48 publications

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“…The depletion of carotenoids leads to chlorophyll oxidation and oxidative damage of photosynthetic components (Dankov et al, 2009), which can explain the lower Φ M and Φ' M values we observed in algal cells exposed to these herbicides. Chlamydomonas reinhardtii acclimated to 25ºC was less sensitive to Fd (1.25 µM) than to Nf at the same concentration, which is probably due to differences in the location of the herbicide binding sites on the enzyme phytoene desaturase.…”

Section: Discussionmentioning

confidence: 81%

Combined effect of temperature and bleaching herbicides on photosynthesis, pigment and fatty acid composition ofChlamydomonas reinhardtii

Chalifour

Arts

Kainz

et al. 2014

European Journal of Phycology

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Norflurazon (Nf) and fluridone (Fd) are phytoene desaturase inhibitor herbicides that are widely used for the control of grasses and invasive aquatic weeds, respectively. These herbicides enter aquatic environments where they can negatively affect non-target plant species (e.g. algae). Their toxicity towards algae may be modified by abiotic factors such as light intensity, temperature, pH and nutrients. Investigating the effect of low temperature on the toxicity of Nf and Fd is particularly important because both temperature and herbicides affect some of the same physiological process (e.g. carotenoid biosynthesis). Here we demonstrate that Nf reduced photosynthesis in the green alga Chlamydomonas reinhardtii more strongly at 15 than at 25ºC, while Fd showed stronger effects at 25 than at 15ºC. Neither herbicide significantly inhibited photosynthesis at 8ºC. Although the overall pigment content decreased with lower temperature, there was an increase in photo-protective carotenoids relative to chlorophylls at both 15 and 8ºC in the absence of herbicides. Moreover, most of the measured pigments decreased markedly in the presence of Nf and Fd at 15 and 25ºC, including β-carotene which fell to below detection limits. The fatty acid composition was modified by temperature and the level of unsaturation noticeably increased at 15 compared with 25ºC. At 8ºC, however, despite a 2.4 times decrease in fatty acid content, the unsaturation level was similar to 25ºC acclimated cells. Monounsaturated fatty acids increased concomitant with a decrease in polyunsaturated fatty acid in the 2.5 µM Nf treatment at 25ºC. Differences in the effect of Nf and Fd on photosynthesis at 15 and 25ºC can be attributed to the marked decrease in carotenoids, which play an important role in photoprotection. At 8ºC, the apparent lack of inhibitory effects compared with control cultures could be due to enhanced photoprotection and/or decreased uptake of herbicides by the alga.

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Section: Discussionmentioning

confidence: 81%

Combined effect of temperature and bleaching herbicides on photosynthesis, pigment and fatty acid composition ofChlamydomonas reinhardtii

Chalifour

Arts

Kainz

et al. 2014

European Journal of Phycology

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“…Fluridone [1-methyl-3-phenyl-5-(3-trifluoromethylphenyl)-4(1H)-pyridinone] is an aquatic herbicide that is increasingly used in integrated pest management programs to control invasive plant species. It functions by inhibiting the synthesis of carotenoids involved in photoprotection of the photosynthetic apparatus (Dankov et al 2009;Getsinger et al 2002;Hamelink et al 1986). Plants differ in their spectrum of light accessory pigments, allowing them to compete against each other for unique niches in aquatic ecosystems (Nelson and Cox 2005).…”

Section: Introductionmentioning

confidence: 99%

Toxicological effects of the aquatic herbicide, fluridone, on male water mites (Hydrachnidiae: Arrenurus: Megaluracarus)

Francis

Jarrell

et al. 2010

Ecotoxicology

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The acute toxicities for technical grade fluridone (Sonar™) and the commercial formulation of fluridone (Sonar®AS) were assessed for male water mites (Hydrachnidiae: Arrenurus: Megaluracarus). Signs of toxicity were evaluated by detection of locomotor dysfunction or death after exposure to concentrations of 100,000, 10,000, 1,000, and 100 μg/L of Sonar™ and 10,000, 5,000, 1,000, 100, and 10 μg/L of Sonar®AS in US EPA, moderately hard reconstituted water (MHRW). The median effective concentration (EC50) was 891 and 631 μg/L for Sonar™ at 48 and 96 h and less than 10 μg/L for Sonar®AS at 96 h. Increased duration of exposure to Sonar®AS from 48 to 96 h had a significant effect on increasing the rate of combined morbidity and mortality. At the lowest concentration of Sonar®AS tested, which is half the concentration allowed within 400 m of any functioning potable water intake for human usage, 40% of the mites were adversely affected at 48 h and 70% were affected after 96 h of exposure. This study demonstrates that Sonar®AS is 60-fold more toxic to water mites than the active ingredient alone. At currently acceptable application rates of 90-150 μg/L fluridone, the addition of ingredients classified as inert, as in Sonar®AS, result in an increased risk of adverse effects on populations of male water mites (Arrenurus: Megaluracarus) in aquatic ecosystems.

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“…The decrease in Chl content was 10% and 35%, respectively (Dankov et al, 2009). The effect of temperature on the thylakoids isolated from LF, HF, and untreated (control) leaves was studied.…”

Section: Resultsmentioning

confidence: 99%

“…The data reveal an increased inhibition of oxygen evolution and primary photochemistry of PSII after fluridone treatment. This effect could be due to a decrease in the amount of carotenoids in the thylakoid membranes from fluridone-treated plants (Dankov et al, 2009). In addition, fluridone treatment also leads to a decrease in chlorophyll content (Dankov et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…This effect could be due to a decrease in the amount of carotenoids in the thylakoid membranes from fluridone-treated plants (Dankov et al, 2009). In addition, fluridone treatment also leads to a decrease in chlorophyll content (Dankov et al, 2009). A simultaneous decrease in chlorophyll and carotenoid could be attributed to photooxidation as a consequence of the decrease in carotenoids, which can, in turn, alter the PSII stability of fluridone-treated thylakoid membranes and their susceptibility to temperature stress.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature sensitivity of photosystem II in isolated thylakoid membranes from fluridone-treated pea leaves

Dankov¹,

Rashkov²,

Misra³

et al. 2015

Turk J Bot

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High temperature-induced changes in the photosystem II (PSII) activity of thylakoid membranes isolated from pea (Pisum sativum L. 'Ran') plants treated with low (10 -8 M) and high (10 -7 M) concentrations of fluridone were investigated. Pulse amplitude modulated (PAM) chlorophyll fluorescence and photosynthetic oxygen evolution (measured by polarographic oxygen rate electrode) were used to estimate the effect of high temperature on the functional activity of PSII. Higher temperature treatments lead to stronger inhibition of the flash oxygen evolution than the primary photochemistry of PSII (F v /F m ). The inhibitory effect of higher temperature on the PSIIα centers is stronger than on the PSIIβ centers. The heat-induced damage in the PSIIα centers as well as in the donor side of all PSII centers (PSIIα and PSIIβ) is accentuated by fluridone.

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Relationship between the degree of carotenoid depletion and function of the photosynthetic apparatus

Cited by 35 publications

References 48 publications

Combined effect of temperature and bleaching herbicides on photosynthesis, pigment and fatty acid composition ofChlamydomonas reinhardtii

Combined effect of temperature and bleaching herbicides on photosynthesis, pigment and fatty acid composition ofChlamydomonas reinhardtii

Toxicological effects of the aquatic herbicide, fluridone, on male water mites (Hydrachnidiae: Arrenurus: Megaluracarus)

Temperature sensitivity of photosystem II in isolated thylakoid membranes from fluridone-treated pea leaves

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