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

• Autorzy: Zou J , Yu K. , Zhang Z. , Jiang W. , Liu D.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

response system; chlorophyll fluorescence; antioxidative protective system; seedling; chromium concentration; antioxidant; chromium; Zea mays; maize; lipid peroxidation

• Wydawca: -
• Czasopismo: Acta Biologica Cracoviensia. Series Botanica
• Rocznik: 2009
• Tom: 51
• Numer: 1
• Opis fizyczny: p.23-33,fig.,ref.

Twórcy

autor

Zou J

• College of Chemistry and Life Sciences, Tianjin Normal University, Tianjin 300387, P.R.China

autor

Yu K.

autor

Zhang Z.

autor

Jiang W.

autor

Liu D.

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