Water stress-sensitized photoinhibition in senescing cotyledons of clusterbean: Changes in thylakoid structures and inactivation of photosystem 2

Title:

Water stress-sensitized photoinhibition in senescing cotyledons of clusterbean: Changes in thylakoid structures and inactivation of photosystem 2

Creator:

Deo, P. M., Biswal, U. C., and Biswal, B.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:c6795ee8-8545-43f0-b156-bb3ee4919d73
uuid:c6795ee8-8545-43f0-b156-bb3ee4919d73
issn:0300-3604
doi:10.1007/s11099-006-0005-x

Subject:

Cyamopsis tetragonolobar, fluorescence polarization, lipid peroxidation, malondialdehyde, membrane fluidity, polyethylene glycol, proteins, and superoxide dismutase

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Seedlings of Cyamopsis tetragonoloba were grown on Petri dishes either in water or water plus 3 % PEG-6000 to induce water stress. The senescing cotyledons experiencing the stress exhibited loss in contents of leaf proteins and chlorophyll (Chl) and a decline in oxygen evolution. The effect of PEG treatment was more pronounced at moderate (MI) than low (LI) irradiance. The stress-induced loss in the activity of superoxide dismutase and increase in the thylakoid lipid peroxidation accompanied a change in the physical status of the bilayer membrane as demonstrated by an enhancement of room temperature Chl a fluorescence polarization and decrease in energy transfer efficiency in pigment assembly. This resulted in a sustained decrease in photosystem 2 activity blocking channels of energy utilization. The absorbed quanta, thus unutilized, were excess even at MI, leading to photoinhibitory response. and P. M. Deo, U. C. Biswal, B. Biswal.

Language:

Multiple languages

Rights:

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

Coverage:

187-192

Source:

Photosynthetica | 2006 Volume:44 | Number:2

Harvested from:

CDK

Metadata only:

false