Abstract
【Objective】 The effects of CaCl2 on photosynthesis and antioxidative enzyme activities in tobacco under high temperature stress were investigated to reveal the mechanism of external Ca2+ enhances the thermotolerance of tobacco plants.【Method】 The K326 tobacco plants were sprayed with different concentrations(0,10,20,30) of CaCl2 for four days,at the fifth day exposed to 43℃ for 2 hours,then returned to normal growth condition for one day recovery.Photosynthetic rate,chlorophyll fluorescence transients(OJIP),MDA content,H2O2 content and the activities of antioxidative enzymes were studied during the process.【Result】 Under heat stress,CaCl2 pretreatment greatly reduced the decrease in net photosynthesis rate(Pn) and maximum photochemical efficiency of PSⅡ(Fv/Fm).Moreover,it alleviated the damage of heat stress to electron transportation of PSII center and oxygen-evolving complex,so that the PSII could maintain high activity.CaCl2 pretreatment also greatly enhanced the activities of SOD,POD,CAT and APX,reduced the accumulation of H2O2,and thus,the active oxygen species were scavenged efficiently;the accumulation of final product of membrane lipid peroxidation(MDA) greatly decreased.The tobacco plants pretreated with 20 mmol·L-1 CaCl2 maintained the highest antioxidant enzymes activities and photosynthetic ability.【Conclusion】 CaCl2 pretreatment alleviated the heat stress damage to PSII center and oxygen evolving complex via enhancing the antioxidant enzymes activities,reducing the accumulation of H2O2 and protecting the membrane from peroxidation.Exogenous CaCl2 application enhanced thermotolerance of tobacco plants under high temperature stress.
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Claims 7
Claim · model-written summary
Calcium chloride pretreatment reduced the heat induced decrease in net photosynthesis.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- CaCl2 pretreatmente0
- Outcome
- net photosynthesis rate(Pn)e0
- Direction
- reduced the decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under heat stress,CaCl2 pretreatment greatly reduced the decrease in net photosynthesis rate(Pn) and maximum photochemical efficiency of PSⅡ(Fv/Fm).”
t0“tobacco”
Claim · model-written summary
Calcium chloride pretreatment reduced the heat induced decrease in maximum PSII efficiency.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- CaCl2 pretreatmente0
- Outcome
- maximum photochemical efficiency of PSⅡ(Fv/Fm)e0
- Direction
- reduced the decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under heat stress,CaCl2 pretreatment greatly reduced the decrease in net photosynthesis rate(Pn) and maximum photochemical efficiency of PSⅡ(Fv/Fm).”
t0“tobacco”
Claim · model-written summary
Calcium chloride alleviated heat damage to PSII electron transport and the oxygen evolving complex.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- CaCl2t1
- Outcome
- electron transportation of PSII center and oxygen-evolving complexe0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover,it alleviated the damage of heat stress to electron transportation of PSII center and oxygen-evolving complex,so that the PSII could maintain high activity.”
t0“tobacco”
t1“CaCl2”
Claim · model-written summary
Calcium chloride enhanced SOD, POD, CAT and APX activities.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- CaCl2 pretreatmente0
- Outcome
- activities of SOD,POD,CAT and APXe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CaCl2 pretreatment also greatly enhanced the activities of SOD,POD,CAT and APX,reduced the accumulation of H2O2”
t0“tobacco”
Claim · model-written summary
Calcium chloride reduced hydrogen peroxide accumulation.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- CaCl2 pretreatmente0
- Outcome
- accumulation of H2O2e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CaCl2 pretreatment also greatly enhanced the activities of SOD,POD,CAT and APX,reduced the accumulation of H2O2”
t0“tobacco”
Claim · model-written summary
Calcium chloride decreased MDA accumulation.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- CaCl2t1
- Outcome
- accumulation of final product of membrane lipid peroxidation(MDA)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of final product of membrane lipid peroxidation(MDA) greatly decreased.”
t0“tobacco”
t1“CaCl2”
Claim · model-written summary
A 20 mmol·L-1 calcium chloride pretreatment gave the highest antioxidant enzyme activities and photosynthetic ability.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- 20 mmol·L-1 CaCl2e0
- Outcome
- antioxidant enzymes activities and photosynthetic abilitye0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tobacco plants pretreated with 20 mmol·L-1 CaCl2 maintained the highest antioxidant enzymes activities and photosynthetic ability.”
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