Abstract
Global soil salinization is accelerating. As the dominant fast-growing plantation genus, Populus spp. largely determines the success of coastal and inland saline-land restoration and the associated carbon-sequestration benefits. Yet most current studies rely on single indicators and lack a multidimensional physiological framework for ranking salt tolerance. Here, six elite poplar cultivars were exposed to 0% (CK), 0.2% (ST1), 0.3% (ST2) and 0.4% NaCl (ST3) for 30 d. We quantified membrane-lipid peroxidation, photosynthetic performance, osmotic adjustment and antioxidant enzymatics, then integrated the data with a principal-component–membership-function model. With increasing NaCl, MDA and REC either rose continuously or peaked slightly below ST3. ‘YX2’ reached the highest MDA (71.3 µmol g−1 FW) and REC (80.3%) under ST2. Pn and SPAD declined overall, but ‘YX3’ retained the greatest photosynthetic stability (6.1 µmol m−2 s−1 at ST3). Osmolytes accumulated differentially: soluble sugar in ‘PZ2’ rose 52% above CK at ST3; soluble protein in ‘YX2’ peaked at 12.7 mg g−1 FW; proline exceeded 110 µg g−1 FW in ‘YX2’, ‘PZ1’ and ‘PZ2’. Antioxidant enzymes were up-regulated with stress; ‘YX3’ CAT peaked at 69.7 U g−1 FW under ST2, while SOD and POD remained highly active. Correlation analysis revealed that photosynthetic decline is tightly linked to membrane oxidative damage, while the coordinated enhancement of antioxidant enzymes and concurrent accumulation of osmolytes form a synergistic protection mechanism. PCA showed that PC1 (57.1%) integrated photosynthetic capacity, membrane integrity and antioxidant synergy, whereas PC2 (14.3%) represented osmotic and enzymatic protection. The combined D-value ranked cultivars as ‘YX2’ > ‘YX3’ > ‘PZ2’ > ‘PZ1’ > ‘ZX1’ > ‘YX1’. This multi-trait platform provides both a theoretical reference and a germplasm basis for saline-site afforestation and salt-tolerant poplar breeding.
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Claims 18
Claim · model-written summary
MDA and REC rose continuously or peaked below the highest NaCl treatment.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increasing NaCl, MDA and REC either rose continuously or peaked slightly below ST3.”
t0“Poplar”
Claim · model-written summary
YX2 had the highest MDA under ST2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘YX2’ reached the highest MDA (71.3 µmol g−1 FW) and REC (80.3%) under ST2.”
t0“Poplar”
Claim · model-written summary
YX2 had the highest REC under ST2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘YX2’ reached the highest MDA (71.3 µmol g−1 FW) and REC (80.3%) under ST2.”
t0“Poplar”
Claim · model-written summary
Pn and SPAD declined overall under salt stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pn and SPAD declined overall”
e1“With increasing NaCl”
t0“Poplar”
Claim · model-written summary
YX3 retained the greatest photosynthetic stability at ST3.
- Material
- ‘YX3’e0
- Treatment
- ST3e0
- Outcome
- photosynthetic stabilitye0
- Direction
- greateste0
- Value
- 6.1 µmol m−2 s−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘YX3’ retained the greatest photosynthetic stability (6.1 µmol m−2 s−1 at ST3)”
t0“Poplar”
Claim · model-written summary
Soluble sugar in PZ2 rose 52% above CK at ST3.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soluble sugar in ‘PZ2’ rose 52% above CK at ST3”
t0“Poplar”
Claim · model-written summary
Soluble protein in YX2 peaked at 12.7 mg g−1 FW.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soluble protein in ‘YX2’ peaked at 12.7 mg g−1 FW”
t0“Poplar”
Claim · model-written summary
Proline exceeded 110 µg g−1 FW in YX2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline exceeded 110 µg g−1 FW in ‘YX2’, ‘PZ1’ and ‘PZ2’”
t0“Poplar”
Claim · model-written summary
Proline exceeded 110 µg g−1 FW in PZ1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline exceeded 110 µg g−1 FW in ‘YX2’, ‘PZ1’ and ‘PZ2’”
t0“Poplar”
Claim · model-written summary
Proline exceeded 110 µg g−1 FW in PZ2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline exceeded 110 µg g−1 FW in ‘YX2’, ‘PZ1’ and ‘PZ2’”
t0“Poplar”
Claim · model-written summary
Antioxidant enzymes were up-regulated with stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Antioxidant enzymes were up-regulated with stress”
t0“Poplar”
Claim · model-written summary
YX3 CAT peaked at 69.7 U g−1 FW under ST2.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘YX3’ CAT peaked at 69.7 U g−1 FW under ST2”
t0“Poplar”
Claim · model-written summary
SOD and POD remained highly active.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD and POD remained highly active”
t0“Poplar”
Claim · model-written summary
Photosynthetic decline was tightly linked to membrane oxidative damage.
- Compound
- membrane oxidative damagee0
- Outcome
- photosynthetic declinee0
- Qualifier
- membrane oxidative damagee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthetic decline is tightly linked to membrane oxidative damage”
t0“Poplar”
Claim · model-written summary
Enhanced antioxidant enzymes and osmolyte accumulation are proposed as synergistic protection.
- Outcome
- synergistic protection mechanisme0
- Qualifier
- coordinated enhancement of antioxidant enzymes and concurrent accumulation of osmolytese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the coordinated enhancement of antioxidant enzymes and concurrent accumulation of osmolytes form a synergistic protection mechanism”
t0“Poplar”
Claim · model-written summary
PC1 explained 57.1% and integrated photosynthetic capacity, membrane integrity, and antioxidant synergy.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PC1 (57.1%) integrated photosynthetic capacity, membrane integrity and antioxidant synergy”
t0“Poplar”
Claim · model-written summary
PC2 explained 14.3% and represented osmotic and enzymatic protection.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PC2 (14.3%) represented osmotic and enzymatic protection”
t0“Poplar”
Claim · model-written summary
The combined D-value ranked cultivars YX2 above YX3 above PZ2 above PZ1 above ZX1 above YX1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined D-value ranked cultivars as ‘YX2’ > ‘YX3’ > ‘PZ2’ > ‘PZ1’ > ‘ZX1’ > ‘YX1’.”
t0“Poplar”
The same questions in other papers
sodium chloride · physiology: photosynthesis · Populus (poplar)Results agree
3 papers in the same direction as this paper
- negative
- negative
- negative
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.