The combined effects of UV-B radiation and herbicides on photosynthesis, antioxidant enzymes and DNA damage in two bloom-forming cyanobacteria

Chen, Lanzhou; Xie, Mu; Bi, Yonghong; Wang, Gaohong; Deng, Songqiang; Liu, Yongding

doi:10.1016/j.ecoenv.2012.03.007

Cited by 38 publications

(21 citation statements)

References 42 publications

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“…Oxidized plastoquinone quenching fluorescence resulted in the decrease of fluorescence at P level. Chen et al [36] reported dose‐dependent decrease in rise of fluorescence at all the steps such as J, I, and P in Anabaena sp. and Microcystis viridis with combined treatment of UV‐B and herbicides glyphosate, MCPA, and DCMU.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2020

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“…Similarly, UV‐B exposed Anabaena sp. and Microcystis viridis partially recovered their fluorescence yield, superoxide dismutase activity and DNA strand breaks during recovery from stress (Chen et al ). Some mechanisms of recovery may exist in B. argenteum crust and this may occur through regeneration of membrane proteins.…”

Section: Discussionmentioning

confidence: 99%

Responses of photosynthetic properties and chloroplast ultrastructure of Bryum argenteum from a desert biological soil crust to elevated ultraviolet‐B radiation

Rong

Chen

et al. 2012

Physiologia Plantarum

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Our understanding of plant responses to enhanced ultraviolet-B (UV-B) radiation has improved over recent decades. However, research on cryptogams is scarce and it remains controversial whether UV-B radiation causes changes in physiology related to photosynthesis. To investigate the effects of supplementary UV-B radiation on photosynthesis and chloroplast ultrastructure in Bryum argenteum Hedw., specimens were cultured for 10 days under four UV-B treatments (2.75, 3.08, 3.25 and 3.41 W m(-2) ), simulating depletion of 0% (control), 6%, 9% and 12% of stratospheric ozone at the latitude of Shapotou, a temperate desert area of northwest China. Analyses showed malondialdehyde content significantly increased, whereas chlorophyll (Chl) fluorescence parameters and Chl contents decreased with increased UV-B intensity. These results corresponded with changes in thylakoid protein complexes and chloroplast ultrastructure. Overall, enhanced UV-B radiation leads to significant decreases in photosynthetic function and serious destruction of the chloroplast ultrastructure of B. argenteum. The degree of negative influences increased with the intensity of UV-B radiation. These results may not only provide a potential mechanism for supplemental UV-B effects on photosynthesis of moss crust, but also establish a theoretical basis for further studies of adaptation and response mechanisms of desert ecosystems under future ozone depletion.

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“…The maximum quantum yield of PSII was demonstrated to be severely inhibited by 2.8 W m −2 UV-B radiation in Dunaliella tertiolecta (Beardall et al, 2002). Based on the recording and analysis of Chl a fluorescence transients (typical O-J-I-P induction), the fluorescence yields at phases J, I and P markedly decline with increasing UV-B dose and exposure time (Chen et al, 2012). Because the efficiency and stability of PSII are important for the functioning of the photosynthetic apparatus, UV-B induced PSII damage can decrease rates of photosynthesis (Holzinger and Lütz, 2006).…”

Section: Introductionmentioning

confidence: 98%

Effect of enhanced UV-B radiation on photosynthetic characteristics of marine microalgae Dunaliella salina (Chlorophyta, Chlorophyceae)

Zhang

Tang

Zhou

et al. 2015

Journal of Experimental Marine Biology and Ecology

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The combined effects of UV-B radiation and herbicides on photosynthesis, antioxidant enzymes and DNA damage in two bloom-forming cyanobacteria

Cited by 38 publications

References 42 publications

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

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

Responses of photosynthetic properties and chloroplast ultrastructure of Bryum argenteum from a desert biological soil crust to elevated ultraviolet‐B radiation

Effect of enhanced UV-B radiation on photosynthetic characteristics of marine microalgae Dunaliella salina (Chlorophyta, Chlorophyceae)

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