Abstract
In this study, we investigated the effects of exogenous calcium nitrate on photoinhibition and thylakoid protein level in peanut plants under heat (40°C) and high irradiance (HI) (1,200 µmol/m(2) per s) stress. Compared with control seedlings (cultivated in 0 mmol/L Ca(NO3 )2 medium), the maximal photochemical efficiency of photosystem II (PSII) in Ca(2+) -treated plants showed a slight decrease after 5 h stress, accompanied by lower degree of PSII closure (1-qP), higher non-photochemical quenching, and lower level of membrane damage. Ca(2+) inhibitors were used to analyze the varieties of antioxidant enzymes activity and PSII proteins. These results indicated that Ca(2+) could protect the subunits of PSII reaction centers from photoinhibition by reducing the generation of reactive oxygen species. In the presence of both ethyleneglycol-bis(2-aminoethylether)-tetraacetic acid and ascorbic acid (AsA), the net degradation of the damaged D1 protein was faster than that only treated with AsA. Our previous study showed that either the transcriptional or the translational level of calmodulin was obviously higher in Ca(2+) -treated plants. These results suggested that, under heat and HI stress, the Ca(2+) signal transduction pathway can alleviate the photoinhibition through regulating the protein repair process besides an enhanced capacity for scavenging reactive oxygen species.
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Claims 7
Claim · model-written summary
Calcium-treated plants showed only a slight decrease in maximal PSII efficiency after five hours of stress.
- Taxon
- peanut
Arachis hypogaeat0 - Treatment
- Ca(2+) -treatede0
- Outcome
- maximal photochemical efficiency of photosystem IIe0
- Direction
- slight decreasee0
- Qualifier
- after 5 h stresse0
- Comparator
- control seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with control seedlings (cultivated in 0 mmol/L Ca(NO3 )2 medium), the maximal photochemical efficiency of photosystem II (PSII) in Ca(2+) -treated plants showed a slight decrease after 5 h stress”
t0“peanut”
Claim · model-written summary
Calcium treatment lowered PSII closure.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- Calciumt0
- Outcome
- PSII closuree0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower degree of PSII closure (1-qP)”
t0“Calcium contributes to photoprotection and repair of photosystem II in peanut leaves during heat and high irradiance”
Claim · model-written summary
Calcium treatment increased non-photochemical quenching.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- Calciumt0
- Outcome
- non-photochemical quenchinge0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher non-photochemical quenching”
t0“Calcium contributes to photoprotection and repair of photosystem II in peanut leaves during heat and high irradiance”
Claim · model-written summary
Calcium treatment lowered membrane damage.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- Calciumt0
- Outcome
- membrane damagee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower level of membrane damage”
t0“Calcium contributes to photoprotection and repair of photosystem II in peanut leaves during heat and high irradiance”
Claim · model-written summary
Calcium was interpreted to protect PSII reaction centers by reducing reactive oxygen species.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- Ca(2+)e0
- Outcome
- photoinhibitione0
- Qualifier
- reducing the generation of reactive oxygen speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ca(2+) could protect the subunits of PSII reaction centers from photoinhibition by reducing the generation of reactive oxygen species”
t0“peanut”
Claim · model-written summary
Combining the chelator and ascorbic acid accelerated damaged D1 degradation relative to ascorbic acid alone.
- Taxon
- peanutArachis hypogaeat0
- Treatment
- ethyleneglycol-bis(2-aminoethylether)-tetraacetic acid and ascorbic acid (AsA)e0
- Gene
- D1 proteine0
- Outcome
- net degradation of the damaged D1 proteine0
- Direction
- fastere0
- Comparator
- AsAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the presence of both ethyleneglycol-bis(2-aminoethylether)-tetraacetic acid and ascorbic acid (AsA), the net degradation of the damaged D1 protein was faster than that only treated with AsA”
t0“peanut”
Claim · model-written summary
The authors proposed calcium signaling alleviates photoinhibition through protein repair and reactive oxygen species scavenging.
- Taxon
- peanutArachis hypogaeat0
- Outcome
- photoinhibitione0
- Qualifier
- regulating the protein repair process besides an enhanced capacity for scavenging reactive oxygen speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Ca(2+) signal transduction pathway can alleviate the photoinhibition through regulating the protein repair process besides an enhanced capacity for scavenging reactive oxygen species”
t0“peanut”
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