Abstract
The main purpose of present study was to evaluate the response of leaf ion content, photosynthesis and chlorophyll fluorescence to NaCl stress in soybean (Glycine max L. Merr.). During salt treatment, soybean seedlings were exposed to 0 or 200 mM NaCl for 1, 6 or 12 days. The results showed that following treatment with NaCl, the content of Na+ and the Na+/K+ ratio in the leaves continually increased, while the K+ content decreased, which suggested that Na+ could compete with K+ to be adsorbed as an ion. Short-term salt stress may not significantly reduce the ability of soybean to utilize light and CO2, but long-term salinity could obviously impair the photosynthetic capacity in soybean leaves. Moreover, Short-term salt stress may also had no obvious effects on $${{F_{{\text{q}}}^{'}} \mathord{\left/ {\vphantom {{F_{{\text{q}}}^{'}} {F_{{\text{m}}}^{'}}}} \right. \kern-0em} {F_{{\text{m}}}^{'}}}$$ and $${{F_{{\text{q}}}^{'}} \mathord{\left/ {\vphantom {{F_{{\text{q}}}^{'}} {F_{{\text{v}}}^{'}}}} \right. \kern-0em} {F_{{\text{v}}}^{'}}}$$ , but severe salt stress would cause the down-regulate of PSII photochemistry and the increase of excessive excitation energy dissipation. The photoinhibitory damage induced by salt stress eventually occured. Consequently, with increased NaCl stress, stem elongation, leaf expansion and biomass accumulation in soybean tended to decrease. These results provided sufficient information on plant photosynthetic response to salinity exposure.
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Claims 9
Claim · model-written summary
NaCl treatment continually increased leaf Na+ content.
Not reportedComparator
Verbatim
e0“The results showed that following treatment with NaCl, the content of Na+ and the Na+/K+ ratio in the leaves continually increased, while the K+ content decreased”
Claim · model-written summary
NaCl treatment continually increased the leaf Na+/K+ ratio.
Not reportedComparator
Verbatim
e0“The results showed that following treatment with NaCl, the content of Na+ and the Na+/K+ ratio in the leaves continually increased, while the K+ content decreased”
Claim · model-written summary
NaCl treatment decreased leaf K+ content.
Not reportedComparator
Verbatim
e0“The results showed that following treatment with NaCl, the content of Na+ and the Na+/K+ ratio in the leaves continually increased, while the K+ content decreased”
Claim · model-written summary
Short-term salt stress may not significantly reduce soybean use of light and CO2.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Short-term salt stresse0
- Outcome
- ability of soybean to utilize light and CO2e0
- Direction
- not significantly reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short-term salt stress may not significantly reduce the ability of soybean to utilize light and CO2, but long-term salinity could obviously impair the photosynthetic capacity in soybean leaves”
Claim · model-written summary
Long-term salinity impaired soybean leaf photosynthetic capacity.
- Taxon
- soybeanGlycine maxe0
- Treatment
- long-term salinitye0
- Outcome
- photosynthetic capacitye0
- Direction
- impaire0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short-term salt stress may not significantly reduce the ability of soybean to utilize light and CO2, but long-term salinity could obviously impair the photosynthetic capacity in soybean leaves”
Claim · model-written summary
Severe salt stress down-regulated PSII photochemistry.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- severe salt stresse0
- Outcome
- PSII photochemistrye0
- Direction
- down-regulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“severe salt stress would cause the down-regulate of PSII photochemistry and the increase of excessive excitation energy dissipation”
t0“Soybean”
Claim · model-written summary
Severe salt stress increased excessive excitation energy dissipation.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- severe salt stresse0
- Outcome
- excessive excitation energy dissipatione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“severe salt stress would cause the down-regulate of PSII photochemistry and the increase of excessive excitation energy dissipation”
t0“Soybean”
Claim · model-written summary
Salt stress induced photoinhibitory damage.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- salt stresse0
- Outcome
- photoinhibitory damagee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photoinhibitory damage induced by salt stress eventually occured”
t0“Soybean”
Claim · model-written summary
Increasing NaCl stress tended to decrease soybean stem elongation, leaf expansion and biomass accumulation.
- Taxon
- soybeanGlycine maxe0
- Treatment
- increased NaCl stresse0
- Outcome
- stem elongation, leaf expansion and biomass accumulatione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Consequently, with increased NaCl stress, stem elongation, leaf expansion and biomass accumulation in soybean tended to decrease”
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