The effects of copper on photosynthesis and biomolecules yield in <i>Chlorolobion braunii</i>

Baracho, Douglas Henrique; Silva, Jaqueline Carmo; Lombardi, Ana Teresa

doi:10.1111/jpy.12914

Cited by 18 publications

(7 citation statements)

References 85 publications

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“…1710 remained unchanged during the initial 72 h even under a Zn concentration as high as 300 mg/L, and only decreased under 600 mg/L Zn at 96 h ( Supplementary Figure S1B ). This was consistent with previous studies ( Baracho et al, 2019 ; Rocha et al, 2021 ) reporting that although the Chl-a content of both C. reinhardtii and Chlamydomonas sp. 1710 significantly decreased upon exposure to Zn, the residual Chl-a still possessed most photosynthetic functions.…”

Section: Resultssupporting

confidence: 94%

Photosynthetic response of Chlamydomonas reinhardtii and Chlamydomonas sp. 1710 to zinc toxicity

Zhan,

Liu,

et al. 2024

Front. Microbiol.

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Zinc (Zn) is an essential trace element but can lead to water contamination and ecological deterioration when present in excessive amounts. Therefore, investigating the photosynthetic response of microalgae to Zn stress is of great significance. In this study, we assessed the photosynthetic responses of neutrophilic Chlamydomonas reinhardtii and acidophilic Chlamydomonas sp. 1710 to Zn exposure for 96 h. The specific growth rate (μ), chlorophyll-a (Chl-a) content, and chlorophyll fluorescence parameters were determined. The results demonstrated that Chlamydomonas sp. 1710 was much more tolerant to Zn than C. reinhardtii, with the half-maximal inhibitory concentration (IC50) values of 225.4 mg/L and 23.4 mg/L, respectively. The μ and Chl-a content of C. reinhardtii decreased in the presence of 15 mg/L Zn, whereas those of Chlamydomonas sp. 1710 were unaffected by as high as 100 mg/L Zn. Chlorophyll fluorescence parameters indicated that the regulation of energy dissipation, including non-photochemical quenching, played a crucial role in Zn stress resistance for both Chlamydomonas strains. However, in the case of C. reinhardtii, non-photochemical quenching was inhibited by 5 mg/L Zn in the first 48 h, whereas for Chlamydomonas sp. 1710, it remained unaffected under 100 mg/L Zn. Chlamydomonas sp. 1710 also exhibited a 20 times stronger capacity for regulating the electron transfer rate than C. reinhardtii under Zn stress. The light energy utilization efficiency (α) of Chlamydomonas sp. 1710 had the most highly non-linear correlation with μ, indicating the energy utilization and regulation process of Chlamydomonas sp. 1710 was well protected under Zn stress. Collectively, our findings demonstrate that the photosystem of Chlamydomonas sp. 1710 is much more resilient and tolerant than that of C. reinhardtii under Zn stress.

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Section: Resultssupporting

confidence: 94%

Photosynthetic response of Chlamydomonas reinhardtii and Chlamydomonas sp. 1710 to zinc toxicity

Zhan,

Liu,

et al. 2024

Front. Microbiol.

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“…The rETR m of A. flexuosus in this study decreased at lower Cu concentrations in comparison to Monoraphidium sp. (Dauda and Lombardi 2023), which decreased at 589 nM Cu 2+ , and Chlorolobion braunii (Baracho et al 2019), which decreased at 5000 nM Cu 2+ . In contrast to our results, the E k of Scenedesmus quadricauda showed very high resilience to Cu ions (Yong et al 2018), which may be related to the genus.…”

Section: Discussionmentioning

confidence: 98%

Photosynthetic and antioxidant responses of Ankistrodesmus flexuosus and Curvastrum pantanale to environmentally relevant copper concentrations

Dauda,

Lombardi

2024

Physiologia Plantarum

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Since high concentrations of copper (Cu) are known to negatively affect algae, we investigated the effect of environmentally relevant concentrations of Cu on the metabolism and photosynthesis of microalgae. We investigated the photosynthesis and antioxidant responses of two green microalgae, Ankistrodesmus flexuosus and Curvastrum pantanale, to free Cu (1.7 nM–589.0 nM Cu2+), which included environmentally significant values (1.7 nM–21.4 nM Cu2+). The microalgae had similar growth rates at low Cu2+, but C. pantanale had higher growth rates at 7.4 and 21.4 nM Cu2+, and a higher Chl a/b ratio at 1.7–21.4 nM Cu2+. The Fv/Fo of A. flexuosus was not altered by Cu, whereas its relative maximum electron transport rate (rETRm) began to decrease at 7.4 nM Cu2+. The Fv/Fo and rETRm of C. pantanale increased at 21.4 nM Cu2+. The non‐photochemical quenching (NPQ) that was actively dissipated [Y(NPQ)] in A. flexuosus increased with Cu increase, whereas at 589.0 nM Cu2+, the NPQ of C. pantanale decreased and its passive energy dissipation [Y(NO)] increased. C. pantanale had higher photosynthesis at 1.7–21.4 nM Cu2+. Superoxide dismutase (SOD) activity increased in both microalgae at high Cu concentrations, at 21.4 nM Cu2+ for A. flexuosus, and at 589.0 nM Cu2+ for C. pantanale. Thus, environmentally relevant Cu concentrations can favor the survival of tolerant microalgae species, hence shifting the diversity of aquatic biota.

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“…The bleaching could be due to the oxidative effects of lead on cell membrane and Chl a content. Heavy metals are known to affect chlorophyll synthesis (Baracho et al, 2019) by interacting with functional sulfhydryl (SH) groups of enzymes involved in chlorophyll biosynthesis (Rekha & Mastan, 2011) and can induce oxidative damage to cell membrane (Chandrashekharaiah, Sanyal, Dasgupta, Sapre, & Banik, 2020). Heavy metals like lead, copper, and mercury act as a substitute for Mg 2+ ion of chlorophyll molecule and affect the light absorption and photosynthesis (Banik et al, 2018; Kupper et al, 2002), thereby affects the CO 2 fixation and biomass production.…”

Section: Discussionmentioning

confidence: 99%

Phycoremediation and photosynthetic toxicity assessment of lead by two freshwater microalgae Scenedesmus acutus and Chlorella pyrenoidosa

Shivagangaiah

Sanyal

Dasgupta

et al. 2021

Physiologia Plantarum

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Heavy metal (HM) pollution is a serious agro‐economic concern and algae can be used as one of the bioremediating agents as it can grow in different water bodies. In this study, the Scenedesmus acutus and Chlorella pyrenoidosa were exposed to various concentrations of Pb2+ for 96 h and a multidimensional toxicity assessment has been performed by pulse amplitude modulation technique and Fourier transform infrared spectroscopy (FTIR). High‐angle annular dark‐field scanning transmission electron microscopy coupled energy dispersive spectroscopy (HAADF‐S/TEM‐EDS) detected intracellular localization of Pb2+, thus confirming algal bio‐accumulation abilities. Sensitivity assay demonstrated that 500 and 400 ppm of Pb2+ as minimum inhibitory concentrations (MIC50) for S. acutus and C. pyrenoidosa, respectively, which inhibited growth (OD) by >50% in 96 h. During bioremoval studies, S. acutus and C. pyrenoidosa were found to remove ∼52 and ∼32% of total Pb2+, respectively. The particulate analysis of Pb2+ by ICP‐OES showed >99.5% biosorption capacity by both the species. The biomass characterization by FTIR showed the involvement of various cell wall functional groups such as hydroxyl, alkane, and C=C groups in the biosorption of Pb2+ by both the species. The noninvasive chlorophyll fluorescence techniques provide a quick insight on heavy metal stress and can be adapted as a rapid detection tool to study the Pb2+ stress. S. acutus strain showed higher tolerance and higher bioremoval capacity than C. pyrenoidosa. However, both the species can be exploited for biosorption of Pb2+ from aquatic streams as an alternative way for low cost Pb2+recovery systems.

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The effects of copper on photosynthesis and biomolecules yield in Chlorolobion braunii

Cited by 18 publications

References 85 publications

Photosynthetic response of Chlamydomonas reinhardtii and Chlamydomonas sp. 1710 to zinc toxicity

Photosynthetic response of Chlamydomonas reinhardtii and Chlamydomonas sp. 1710 to zinc toxicity

Photosynthetic and antioxidant responses of Ankistrodesmus flexuosus and Curvastrum pantanale to environmentally relevant copper concentrations

Phycoremediation and photosynthetic toxicity assessment of lead by two freshwater microalgae Scenedesmus acutus and Chlorella pyrenoidosa

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