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Abstract:

In this work, we use the effect of herbicides that affect the photosynthetic chain at defined sites in the photosynthetic reaction steps to derive information about the fluorescence emission of photosystems. The interpretation of spectral data from treated and control plants, after correction for light reabsorption processes, allowed us to elucidate current controversies in the subject. Results were compatible with the fact that a nonnegligible Photosystem I contribution to chlorophyll fluorescence in plants at room temperature does exist. In another aspect, variable and nonvariable chlorophyll fluorescence were comparatively tested as bioindicators for detection of both herbicides in aquatic environment. Both methodologies were appropriate tools for this purpose. However, they showed better sensitivity for pollutants disconnecting Photosystem II-Photosystem I by blocking the electron transport between them as Atrazine. Specifically, changes in the (experimental and corrected by light reabsorption) red to far red fluorescence ratio, in the maximum photochemical quantum yield and in the quantum efficiency of Photosytem II for increasing concentrations of herbicides have been measured and compared. The most sensitive bioindicator for both herbicides was the quantum efficiency of Photosystem II. In this work we use the effect of herbicides at defined sites in the photosynthetic chain to derive information about the fluorescence emission of photosystems. Additionally, chlorophyll fluorescence was tested as a bioindicator for detection of both herbicides in aquatic environment. © 2013 The American Society of Photobiology.

Registro:

Documento: Artículo
Título:Atrazine and methyl viologen effects on chlorophyll-a fluorescence revisited - Implications in photosystems emission and ecotoxicity assessment
Autor:Iriel, A.; Novo, J.M.; Cordon, G.B.; Lagorio, M.G.
Filiación:Centro de Estudios Transdisciplinarios Del Agua, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina
INQUIMAE/ Dpto. de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires Ciudad Universitaria, Buenos Aires, Argentina
LART-IFEVA/ Dpto. de Métodos Cuantitativos y Sistemas de Información, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina
Idioma: Inglés
Año:2014
Volumen:90
Número:1
Página de inicio:107
Página de fin:112
DOI: http://dx.doi.org/10.1111/php.12142
Título revista:Photochemistry and Photobiology
Título revista abreviado:Photochem. Photobiol.
ISSN:00318655
CODEN:PHCBA
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_00318655_v90_n1_p107_Iriel

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Citas:

---------- APA ----------
Iriel, A., Novo, J.M., Cordon, G.B. & Lagorio, M.G. (2014) . Atrazine and methyl viologen effects on chlorophyll-a fluorescence revisited - Implications in photosystems emission and ecotoxicity assessment. Photochemistry and Photobiology, 90(1), 107-112.
http://dx.doi.org/10.1111/php.12142
---------- CHICAGO ----------
Iriel, A., Novo, J.M., Cordon, G.B., Lagorio, M.G. "Atrazine and methyl viologen effects on chlorophyll-a fluorescence revisited - Implications in photosystems emission and ecotoxicity assessment" . Photochemistry and Photobiology 90, no. 1 (2014) : 107-112.
http://dx.doi.org/10.1111/php.12142
---------- MLA ----------
Iriel, A., Novo, J.M., Cordon, G.B., Lagorio, M.G. "Atrazine and methyl viologen effects on chlorophyll-a fluorescence revisited - Implications in photosystems emission and ecotoxicity assessment" . Photochemistry and Photobiology, vol. 90, no. 1, 2014, pp. 107-112.
http://dx.doi.org/10.1111/php.12142
---------- VANCOUVER ----------
Iriel, A., Novo, J.M., Cordon, G.B., Lagorio, M.G. Atrazine and methyl viologen effects on chlorophyll-a fluorescence revisited - Implications in photosystems emission and ecotoxicity assessment. Photochem. Photobiol. 2014;90(1):107-112.
http://dx.doi.org/10.1111/php.12142