The influence of increased solar UV-B radiation on magnesium-deficient cowpea seedlings: Changes in the photosynthetic characteristics

Title:

The influence of increased solar UV-B radiation on magnesium-deficient cowpea seedlings: Changes in the photosynthetic characteristics

Creator:

Premkumar, A. and Kulandaivelu, G.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:2c147f9e-bbca-4eb1-8003-ed799941a490
uuid:2c147f9e-bbca-4eb1-8003-ed799941a490
issn:0300-3604
doi:10.1023/A:1007006401360

Subject:

chlorophyll, chlorophyll fluorescence, induction, chloroplast proteins, CO2 uptake, net photosynthetic rate, photochemical activities, and Vigna unguiculata

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The influence of increased solar UV-B radiation on the photosynthetic characteristics in cowpea seedlings (Vigna unguiculata) grown at optimal (Mgs) and low (Mgd) Mg levels were studied. Both higher UV-B and Mgd treatments caused significant drops of photochemical activities and net CO2 uptake rates (PN). Yet the UV-B-induced decrease in the photosynthetic efficiency was lesser in Mgd seedlings. The leaf Chl a fluorescence measurements proved that after receiving an enhanced UV-B radiation these seedlings showed a significant enhancement in their variable parts. The PSM oscillation of slow fluorescence kinetics was remarkably altered by both treatments. The PN also followed a typical inhibitory pattern as seen in photochemical activities. Concentrations of several chloroplast proteins in trifoliate leaves were significantly reduced by Mgd treatment and unaffected by the other two treatments. Whereas the contents of 43-47 kDa polypeptides in primary leaves were markedly reduced with a maximal effect in Mgd seedlings, no major difference was noted for combined stress. and A. Premkumar, G. Kulandaivelu.

Language:

Multiple languages

Rights:

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

Coverage:

21-29

Source:

Photosynthetica | 1999 Volume:36 | Number:1-2

Harvested from:

CDK

Metadata only:

false