Abstract
Modulated chlorophyll fluorescence and rapid fluorescence induction kinetics were used to evaluate the functions of photosystem II (PSII) photochemsitry in sorghum leaves exposed to salinity (0–100 mM NaCl) and/or high temperature stress (30–50°C). No differences were detected in the steady- state fluorescence parameters and rapid fluorescence induction kinetics in salt-stressed leaves, indicating that PSII was highly resistant to salinity stress alone. However, salinity stress modified the responses of PSII to high temperature. When the temperature was above 45°C, the thermostability of PSII was strongly enhanced in salt-stressed leaves, which was reflected in a smaller decrease in maximum efficiency of PSII photochemistry, coefficients of photochemical and non-photochemical quenching, and efficiency of excitation capture by open PSII reaction centres, and in a smaller increase in the proportion of the QB-non-reducing PSII centres in salt-stressed leaves than in control leaves. This increased thermostability in salt-stressed leaves exposed to high temperature seemed to be independent of the imposed salt concentration since there were no significant variations in the above fluorescence parameters among the salt-stressed plants treated with different salt concentrations. The results are discussed in terms of the physiological significance of such increased resistance of PSII to high temperature.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Salt-stressed leaves showed no detected fluorescence or induction-kinetic differences.
- Treatment
- salt-stressede0
- Outcome
- steady- state fluorescence parameters and rapid fluorescence induction kineticse0
- Direction
- No differencese0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences were detected in the steady- state fluorescence parameters and rapid fluorescence induction kinetics in salt-stressed leaves”
e1“sorghum leaves”
Claim · model-written summary
Salinity enhanced PSII thermostability above 45°C.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the temperature was above 45°C, the thermostability of PSII was strongly enhanced in salt-stressed leaves”
e1“sorghum leaves”
Claim · model-written summary
Under heat, salt-stressed leaves had a smaller decrease in PSII efficiency and quenching measures than controls.
- Treatment
- salt-stressede0
- Outcome
- maximum efficiency of PSII photochemistry, coefficients of photochemical and non-photochemical quenching, and efficiency of excitation capture by open PSII reaction centrese0
- Direction
- smaller decreasee0
- Comparator
- control leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a smaller decrease in maximum efficiency of PSII photochemistry, coefficients of photochemical and non-photochemical quenching, and efficiency of excitation capture by open PSII reaction centres, and in a smaller increase in the proportion of the QB-non-reducing PSII centres in salt-stressed leaves than in control leaves”
e1“sorghum leaves”
Claim · model-written summary
Under heat, salt-stressed leaves had a smaller increase in QB-non-reducing PSII centres than controls.
- Treatment
- salt-stressede0
- Outcome
- proportion of the QB-non-reducing PSII centrese0
- Direction
- smaller increasee0
- Comparator
- control leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a smaller increase in the proportion of the QB-non-reducing PSII centres in salt-stressed leaves than in control leaves”
e1“sorghum leaves”
Claim · model-written summary
Fluorescence measures showed no significant variation among salt concentrations under heat.
- Treatment
- different salt concentrationse0
- Outcome
- above fluorescence parameterse0
- Direction
- no significant variationse0
- Comparator
- salt-stressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no significant variations in the above fluorescence parameters among the salt-stressed plants treated with different salt concentrations”
e1“sorghum leaves”
The same questions in other papers
salinity · physiology: photosynthesis · SorghumPositive and negative results
24 in the opposite direction
- negative
- no effect
- negative
21 papers more in this group
See all 25 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.