Increase in the intensity of thermoluminescence Q‐band during leaf ageing is due to a block in the electron transfer from Q<sub><scp>A</scp></sub> to Q<sub><scp>B</scp></sub>

Biswal, Ajaya K.; Dilnawaz, Fahima; David, K. A. V.; Ramaswamy, N.K.; Misra, A. N.

doi:10.1002/bio.660

Cited by 15 publications

(10 citation statements)

References 21 publications

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“…1B, C). This was reported earlier as a phenomenon of the generation of an electron transport inhibitor in Indian mustard leaves, which blocks the electron transfer from Q A to Q B (13). NaCl salt treatment affected the TL glow curves.…”

Section: Resultssupporting

confidence: 62%

“…A new peak was observed at 20°C with NaCl (1%) treatment. The Q band intensity in ageing leaves increased simultaneously with the suppression of the B band, suggesting of the generation of an electron transport inhibitor and/or blocking of electron transport from Q A to Q B during leaf ageing (13). NaCl treatment retarded the ageing-induced enhancement in the Q peak.…”

Section: Resultsmentioning

confidence: 94%

“…2). A gradual ageing-induced increase in this ratio was interpreted as the generation and accumulation of electron transport inhibitors in Indian mustard leaves during ageing (13). The TL signals in isolated thylakoid membranes were postulated to be due to washing of these electron transport inhibitors, during thylakoid membrane isolation (13).…”

Section: Resultsmentioning

confidence: 99%

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Thermoluminescence characteristics of sodium chloride salt‐stressed Indian mustard seedlings

et al. 2002

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The thermoluminescence (TL) parameters in the intact leaves and the thylakoids isolated from leaves of NaCl treated seedlings showed different patterns of change. NaCl treatment brings about a destabilization of QA and QB, leading to a decrease in Q and B bands in the leaves. However, the Q and B band intensity of isolated thylakoids increased in NaCl-treated seedlings. The differences in the TL intensities are described as the action of NaCl on the density of quinones per unit leaf area and on chlorophyll units in isolated thylakoids.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 94%

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Thermoluminescence characteristics of sodium chloride salt‐stressed Indian mustard seedlings

et al. 2002

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“…The chlorophyll content is directly related to the plant physiological state and function and there exists a linear correlation between the DLE intensity and chlorophyll content (within a limited range) (9). Also the interrelationships between DLE characteristics and leaf senescence (10), decrease in the thylakoid protein content and the photochemical efficiency of photosystem II (11,12), inactivation of the oxygen evolution system (13), release of manganese (Mn) and degradation of D1 polypeptide have been reported (14). Accordingly, monitoring DLE provides an important method for the analysis of plant physiology.…”

Section: Reversed the Oxidized P 680mentioning

confidence: 99%

Effect of artificial acid rain and SO2 on characteristics of delayed light emission

et al. 2005

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The structure and function of chloroplast in plant leaves can be affected by acid rain and air pollution. The photosystem II in a plant is considered the primary site where light-induced delayed light emission (DLE) is produced. With the lamina of zijinghua (Bauhinia variegata L.) and soybean (Glycine max (L.) Merr.) as testing models, we studied the effects of artificial acid rain and SO2 on characteristics of DLE by using a home-made weak luminescence detection system. The results show that the changes in DLE intensity of green plants can reflect the changes in chloroplast intactness and function. With proper calibration, DLE may provide an alternative means of evaluating environmental acid stress on plants. The changes in DLE intensity may provide a new approach for the detection of environmental pollution and its impact on the ecosystem.

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“…DF has many practical applications (5)(6)(7). The interrelationships between DF characteristics and leaf senescence (8), decrease in the thylakoid protein content and the photochemical efficiency of photosystem II (PSII) (9,10), inactivation of the oxygen evolution system (11), release of manganese (Mn) and degradation of D1 polypeptide (12) have been reported. Thus, monitoring DF provides an important method of studying plant physiology (13).…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic studies on origination of the peak at 730 nm in delayed fluorescence of chloroplasts

et al. 2007

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The origination of the peak at 730 nm in the delayed fluorescence (DF) spectrum of chloroplasts was studied using various optical analysis methods. The DF spectrum showed that the main emission peak was at about 685 nm, with a small shoulder at 730 nm when the chloroplast concentration was < 7.8 microg/mL. The intensity of the peak at 685 nm decreased, while the intensity of the peak at 730 nm increased, when the chloroplast concentrations were increased from 7.8 to 31.2 microg/mL. With the concentration increasing, the peak at 730 nm became dominant while the peak at 685 nm finally disappeared. The DF decay kinetic curves showed that the intensity of the peak at 730 nm decayed as the same speed as the intensity of the peak at 685 nm during the entire relaxation process (0.5-30.5 s). With the excitation wavelength at 685 nm, the emission intensity was stronger in the excitation spectrum at 730 nm. The absorption spectrum demonstrated that the ratio A(685):A(730) remained almost constant when the chloroplast concentration increased. The results suggest that the peak at 730 nm appearing in DF is mainly contributed by the fluorescence of photosystem I (PSI), generated by the re-absorption of 685 nm band DF.

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Increase in the intensity of thermoluminescence Q‐band during leaf ageing is due to a block in the electron transfer from Q_A to Q_B

Cited by 15 publications

References 21 publications

Thermoluminescence characteristics of sodium chloride salt‐stressed Indian mustard seedlings

Thermoluminescence characteristics of sodium chloride salt‐stressed Indian mustard seedlings

Effect of artificial acid rain and SO2 on characteristics of delayed light emission

Spectroscopic studies on origination of the peak at 730 nm in delayed fluorescence of chloroplasts

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Increase in the intensity of thermoluminescence Q‐band during leaf ageing is due to a block in the electron transfer from QA to QB

Cited by 15 publications

References 21 publications

Thermoluminescence characteristics of sodium chloride salt‐stressed Indian mustard seedlings

Thermoluminescence characteristics of sodium chloride salt‐stressed Indian mustard seedlings

Effect of artificial acid rain and SO2 on characteristics of delayed light emission

Spectroscopic studies on origination of the peak at 730 nm in delayed fluorescence of chloroplasts

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Increase in the intensity of thermoluminescence Q‐band during leaf ageing is due to a block in the electron transfer from Q_A to Q_B