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Antioxidant response system and chlorophyll fluorescence in chromium [VI] - treated Zea mays L. seedlings

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Zou J., Yu K., Zhang Z., Jiang W., Liu D.

Acta Biologica Cracoviensia. Series Botanica

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2009

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tom 51

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nr 1

23-33

The effects of different concentrations of Cr(VI) (1 µM, 10 µM, 100 µM) applied for 7, 14 or 21 days on initiation of high lipid peroxidation level (POL) and consequent changes in the enzymatic-antioxidant protective system and minimization of photosystem II (PSII) activity were studied in maize seedlings. Chromium (VI) caused an increase in the electrical conductivity of the cell membrane, and malondialdehyde (MDA) content (a peroxidation product) reflected peroxidation of membrane lipids leading to the loss of the membrane's selective permeability. It also induced distinct and significant changes in antioxidant enzyme activity. Versus the control, superoxide dismutase (SOD, EC 1.15.1.1.), catalase (CAT, EC 1.11.1.6.) and peroxidase (POD, EC 1.11.1.11.) activity in maize seedling roots and leaves was progressively enhanced by the different Cr(VI) doses and stress periods, except for decreases in SOD and POD activity in leaves exposed to 100 µM Cr(VI) for 21 days. The different Cr(VI) concentrations changed chlorophyll (chl) content differently. The 10 µM and 100 µM doses of Cr(VI) decreased the chl a/b ratio and quenched the chl a fluorescence emission spectra. These effects reflect disturbance of the structure, composition and function of the photosynthetic apparatus as well as PSII activity.

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Molecular basis of quorum sensing signal-response systems in bacteria

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Ziemichod A., Skotarczak B.

Acta Biologica

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2017

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tom 24

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Some aspects of the SOS response system - A critical survey

100%

Janion C.

Acta Biochimica Polonica

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2001

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tom 48

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nr 3

The SOS system and SOS mutagenesis are frequently studied, or exploited to obtain an increase in mutagenicity of bacteria. Here a short survey is made of the phenomenon of SOS response with special attention to latest and less discussed data, especially the induction of the SOS system in response to cell starvation or mutation of certain genes and the role of inducible DNA polymerases.

Ograniczanie wyników

1 Acta Biochimica Polonica

1 Acta Biologica

1 Acta Biologica Cracoviensia. Series Botanica

1 Janion C.

1 Jiang W.

1 Liu D.

1 Skotarczak B.

1 Yu K.

1 Zhang Z.

1 Ziemichod A.

1 Zou J.

1 2017

1 2009

1 2001

Antioxidant response system and chlorophyll fluorescence in chromium [VI] - treated Zea mays L. seedlings

Molecular basis of quorum sensing signal-response systems in bacteria

Some aspects of the SOS response system - A critical survey