Abstract
【Objective】The impacts of salt stress on the photosynthesis and chlorophyll fluorescence parameters of sorghum seedlings were studied for providing a foundation for sorghum cultivation,breeding and artificial regulation of salt stress.【Method】Salt tolerant cultivar(Liaoza 15) and salt sensitive cultivar(Longza 11) were incubated in the nutrient solution at humidity of 60%,light/dark of 12 h/12 h,illumination of 134 μmol·m-2·s-1 and 28℃/25℃ of day/night.NaCl was added into the solution at 3-leaf stage and NaCl concentration levels at 0,50,100,150 and 200 mmol·L-1,respectively.The response of sorghum seedlings to NaCl stress was assessed by measuring the photosynthesis and chlorophyll fluorescence parameters of seedlings.【Result】Low NaCl concentration(50 mmol·L-1) increased the chlorophyll content,and high NaCl concentration(100-200 mmol·L-1) reduced the content substantially.Salt stress reduced Pn,Gs,Tr,Fm,Fv/Fo,Fv/Fm,Fv′/Fm′ and qP,and increased Fo and NPQ.Low NaCl concentration(50 mmol·L-1) reduced Ci,and high NaCl concentration(100-200 mmol·L-1) increased it.The adverse impact of salt stress on Liaoza 15 was less than on Longza 11.【Conclusion】The small reduction in net photosynthesis rate caused by 50 mmol·L-1 NaCl stress was considered to be a result of non-stomatal restriction;but increased stomatal restriction with increased NaCl concentration resulted in more severe reductions in photosynthesis.Under salt stress,salt tolerant cultivar could protect the photosynthetic organs more effectively than salt sentitive cultivar and thus improve the production of sorghum in salt affected areas.
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Claims 11
Claim · model-written summary
Low NaCl increased chlorophyll content.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low NaCl concentration(50 mmol·L-1) increased the chlorophyll content”
t0“sorghum seedlings”
Claim · model-written summary
High NaCl substantially reduced chlorophyll content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high NaCl concentration(100-200 mmol·L-1) reduced the content substantially”
t0“sorghum seedlings”
Claim · model-written summary
Salt stress reduced Pn, Gs, and Tr.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress reduced Pn,Gs,Tr,Fm,Fv/Fo,Fv/Fm,Fv′/Fm′ and qP”
t0“sorghum seedlings”
Claim · model-written summary
Salt stress reduced Fm, Fv/Fo, and Fv/Fm.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress reduced Pn,Gs,Tr,Fm,Fv/Fo,Fv/Fm,Fv′/Fm′ and qP”
t0“sorghum seedlings”
Claim · model-written summary
Salt stress reduced Fv′/Fm′ and qP.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress reduced Pn,Gs,Tr,Fm,Fv/Fo,Fv/Fm,Fv′/Fm′ and qP”
t0“sorghum seedlings”
Claim · model-written summary
Salt stress increased Fo and NPQ.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and increased Fo and NPQ”
t0“salt stress on characteristics of photosynthesis and chlorophyll fluorescence of sorghum seedlings”
Claim · model-written summary
Low NaCl reduced Ci.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low NaCl concentration(50 mmol·L-1) reduced Ci”
t0“sorghum seedlings”
Claim · model-written summary
High NaCl increased Ci.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low NaCl concentration(50 mmol·L-1) reduced Ci,and high NaCl concentration(100-200 mmol·L-1) increased it”
t0“photosynthesis and chlorophyll fluorescence of sorghum seedlings”
Claim · model-written summary
Salt stress adversely affected Liaoza 15 less than Longza 11.
- Material
- Liaoza 15e0
- Treatment
- salt stresse0
- Outcome
- adverse impacte0
- Direction
- lesse0
- Comparator
- Longza 11e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The adverse impact of salt stress on Liaoza 15 was less than on Longza 11”
t0“sorghum seedlings”
Claim · model-written summary
The authors attributed the small photosynthesis reduction at 50 mmol·L-1 NaCl to non-stomatal restriction.
- Treatment
- 50 mmol·L-1 NaCl stresse0
- Outcome
- net photosynthesis ratee0
- Qualifier
- non-stomatal restrictione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The small reduction in net photosynthesis rate caused by 50 mmol·L-1 NaCl stress was considered to be a result of non-stomatal restriction”
t0“sorghum seedlings”
Claim · model-written summary
The authors attributed greater photosynthesis reductions at higher NaCl to increased stomatal restriction.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased stomatal restriction with increased NaCl concentration resulted in more severe reductions in photosynthesis”
t0“sorghum seedlings”
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