Effects of chromium toxicity on leaf photosynthetic characteristics and oxidative changes in wheat (Triticum aestivum L.)

Title:

Effects of chromium toxicity on leaf photosynthetic characteristics and oxidative changes in wheat (Triticum aestivum L.)

Creator:

Subrahmanyam, D.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:d32412e3-0e5e-48a6-80e5-4d7ba92334ff
uuid:d32412e3-0e5e-48a6-80e5-4d7ba92334ff
issn:0300-3604
doi:10.1007/s11099-008-0062-4

Subject:

antioxidants, catalase, ascorbate peroxidase, chlorophyll fluorescence, glutathione reductase, lipid peroxidation, photochemical and non-photochemical quenching, photosystem 2, and superoxide dismutase

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Cr(VI) significantly reduced rates of net photosynthesis and transpiration and of stomatal conductance. Cr(VI) did not affect the Fv/Fm ratio of chlorophyll fluorescence implying that the primary photochemical processes in photosystem 2 were not affected. However, the efficiency of excitation capture by open PS2 centres, in vivo quantum yield of PS2 photochemistry, and electron transport rate were significantly reduced by Cr(VI). The coefficient of photochemical quenching was reduced with a concomitant increase in coefficient of non-photochemical quenching, suggesting reduced demand for ATP and NADPH due to inhibition of CO2 assimilation. Lipid peroxidation was increased by Cr(VI) and the activities of superoxide dismutase and catalase (CAT) were increased. However, the CAT activity was reduced by high Cr(VI) concentration. The activities of ascorbate peroxidase and glutathione reductase were significantly reduced by Cr(VI) treatment.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

339-345

Source:

Photosynthetica | 2008 Volume:46 | Number:3

Harvested from:

CDK

Metadata only:

false