Thermoluminescence in Chloroplast Thylakoid

Misra, A. N.; Misra, Meena; Singh, Ranjeet

doi:10.5772/35109

Cited by 1 publication

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References 93 publications

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“…Thermoluminescence (TL) emission curves can be used to study photosynthetic electron transport (Vass & Govindjee, 1996) to monitor the effects of different biotic or abiotic stressors (Misra et al, 2012) and to examine lipid peroxidation (Ducruet & Vass, 2009). High-temperature thermoluminescence (HTTL) measurements provide a valuable tool to investigate the oxidative stress in vivo and its effect on the photosynthetic capacity by measuring low-level chemiluminescence emission.…”

Section: Monitoring Lipid Peroxidation By Hightemperature Thermolumin...mentioning

confidence: 99%

Etioplasts are more susceptible to salinity stress than chloroplasts and photosynthetically active etio‐chloroplasts of wheat (Triticum aestivum L.)

Ounoki,

Sóti,

Ünnep

et al. 2023

Physiologia Plantarum

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High soil salinity is a global problem in agriculture that directly affects seed germination and the development of the seedlings sown deep in the soil. To study how salinity affected plastid ultrastructure, leaf segments of 11‐day‐old light‐ and dark‐grown (etiolated) wheat (Triticum aestivum L. cv. Mv Béres) seedlings were floated on Hoagland solution, 600 mM KCl:NaCl (1:1) salt or isosmotic polyethylene glycol solution for 4 h in the dark. Light‐grown seedlings were also treated in the light. The same treatments were also performed on etio‐chloroplasts of etiolated seedlings greened for different time periods. Salt stress induced slight to strong changes in the relative chlorophyll content, photosynthetic activity, and organization of thylakoid complexes. Measurements of malondialdehyde contents and high‐temperature thermoluminescence indicated significantly increased oxidative stress and lipid peroxidation under salt treatment, except for light‐grown leaves treated in the dark. In chloroplasts of leaf segments treated in the light, slight shrinkage of grana (determined by transmission electron microscopy and small‐angle neutron scattering) was observed, while a swelling of the (pro)thylakoid lumen was observed in etioplasts. Salt‐induced swelling disappeared after the onset of photosynthesis after 4 h of greening. Osmotic stress caused no significant alterations in plastid structure and only mild changes in their activities, indicating that the swelling of the (pro)thylakoid lumen and the physiological effects of salinity are rather associated with the ionic component of salt stress. Our data indicate that etioplasts of dark‐germinated wheat seedlings are the most sensitive to salt stress, especially at the early stages of their greening.

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Section: Monitoring Lipid Peroxidation By Hightemperature Thermolumin...mentioning

confidence: 99%