Copper Stress on Photosynthesis of Black Mangle (Avicennia germinans)

Abstract

The effects of copper toxicity on the photosynthetic activities of Avicennia germinans was investigated using two CuSO 4 concentrations (0.062 and 0.33 M) added in Hoagland's solution in an aerated hydroponic system. Photosynthesis and chlorophyll fl uorescence were measured after 30 h of copper stress. Results obtained in this study show that increasing levels of Cu +2 of 0.062 and 0.33 M Cu +2 resulted in a general reduction of the stomatal conductance (28 and 18%, respectively) and 100% of inhibition of net photosynthesis. Additionally, at these concentrations of Cu +2, reductions of chlorophyll fl uorescence parameters were also observed. These changes suggested that the photosynthetic apparatus of Avicennia germinans was the primary target of the Cu +2 action. It is concluded that Cu +2 ions causes a drastic decline in photosynthetic gas exchange and Chlorophyll fl uorescence parameters in A. germinans leaves.

Genome-wide analysis of transcription and photosynthesis inhibition in the harmful dinoflagellate Prorocentrum minimum in response to the biocide copper sulfate

“…1a). Similar to these results, photosynthesis was decreased by copper in the sensitive Silene paradoxa L. populations, black mangle, and in red algae Antithamnion plumula (Gonzalez-Mendoza et al, 2013;Bazihizina et al, 2014;Zou et al, 2015). In addition, the excess copper decreased chloroplast pigment (including chlorophyll and carotenoids) concentration in the dinoflagellate Cochlodinium polykrikoides , as well as in the diatom Phaeodactylum tricornutum .…”

“…Photosynthesis in photosynthetic organisms is sensitive to environmental variation (Jamers et al, 2006;Gonzalez-Mendoza et al, 2013;Bazihizina et al, 2014;Zou et al, 2015). As expected, excess Cu 2+ caused a decrease in the photosynthetic efficiency of Prorocentrum minimum (Fig.…”

Bioaccumulation and changes in the photosynthetic apparatus of Prosopis juliflora exposed to copper

“…It may indicate that Fv/Fo and Fo/Fv parameters are the most sensitive components in the photosynthetic electron transport chain in the presence of high copper concentration. In agreement to these results, it has been previously confirmed that the Fv/Fo and Fo/Fv parameter are the most sensitive component of PSII under undesirable conditions (González-Mendoza et al, 2013). Similar results were observed by and Singh et al (2013) who reported that higher concentrations of heavy metals induced one rapid inactivation of PSII in Luffa acutangula under hydroponics conditions.…”

“…The chlorophyll fluorescence was measured using a Plant Efficiency Analyser (PEA, Hansatech Instruments Ltd., King's Lynn Norfolk PE32 1JL, UK) on completely expanded leaves. The leaves were subjected to a 5 min period of adaptation to darkness under to induce the complete oxidation of the reaction centers using light exclusion clips (González-Mendoza et al, 2013).…”

Interaction between arbuscular mycorrhizal fungi and vermicompost on copper phytoremediation in a sandy soil

“…Excess Cu in plant tissues resulted in detrimental effects for the photosynthetic machinery, as indicated by the chlorophyll fluorescence parameters (González-Mendoza et al, 2013). Increases in minimal fluorescence (Fo) result from the destruction of photosystem II (PSII) reaction centers or decreased transfer of excitation energy to the reaction center caused by excess Cu in the plant tissues (Baker and Rosenqvst, 2004).…”