Abstract
Leaf development of wheat largely determines the rate of plant growth in the early growth stages and is most sensitive to salinity. The objectives were to investigate the shoot growth, area of leaves, and kinetics of leaf elongation of wheat seedlings (Triticum aestivum L.) grown in illitic‐chloritic silt loam with four salinity levels from 0 to 120 mM NaCl in growth chambers. Shoot fresh mass (FM) and leaf area were measured at days 12 and 18 after sowing. Instantaneous measurements of the leaf elongation rate (LER) of leaves 3, 4, and 5 of the main stem were carried out by using linear variable differential transducers (LVDT). Spatial distribution of relative elemental growth rate (REGR) and the length of the leaf elongation zone were determined by measuring displacement rates with a pricking method. Shoot FM per plant linearly decreased with increasing salinity levels. Leaf area under saline conditions was significantly correlated to the shoot FM during vegetative stages, indicating that leaf growth most sensitively responds to salinity. Salinity delayed leaf emergence and affected leaf growth longitudinally and laterally. Reduction in the final length of leaves 3, 4, and 5 was mainly a result of a decrease in their LER. The decreased LER under saline conditions was more pronounced during the steady growth phase and during the light period compared to later stages and to the dark period, respectively. Salinity affected the LER more severely with increasing leaf number, probably as a result of the longer exposure to salinity and longer elongation zones for higher leaf numbers. The reduction in LER resulted from decreasing the REGR but did not result from shortening the length of the leaf elongation zone during the linear phase of leaf growth.
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Claims 10
Claim · model-written summary
Shoot fresh mass declined linearly as salinity rose.
- Taxon
- wheat seedlings
Triticum aestivume1 - Treatment
- salinity levelse0
- Outcome
- Shoot FM per plante0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot FM per plant linearly decreased with increasing salinity levels.”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
Leaf area under saline conditions correlated significantly with shoot fresh mass during vegetative stages.
- Taxon
- wheat seedlingsTriticum aestivume1
- Treatment
- saline conditionse0
- Outcome
- Leaf areae0
- Qualifier
- shoot FM during vegetative stagese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area under saline conditions was significantly correlated to the shoot FM during vegetative stages”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
Salinity delayed leaf emergence.
- Taxon
- wheat seedlingsTriticum aestivume1
- Treatment
- Salinitye0
- Outcome
- leaf emergencee0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity delayed leaf emergence”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
Salinity affected leaf growth longitudinally and laterally.
- Taxon
- wheat seedlingsTriticum aestivume1
- Treatment
- Salinitye0
- Outcome
- leaf growth longitudinally and laterallye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity delayed leaf emergence and affected leaf growth longitudinally and laterally.”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
Reduced final length of leaves 3, 4, and 5 was mainly attributed to lower leaf elongation rate.
- Taxon
- wheat seedlingsTriticum aestivume1
- Organ / stage
- leaves 3, 4, and 5e0
- Outcome
- final length of leaves 3, 4, and 5e0
- Direction
- Reductione0
- Qualifier
- a decrease in their LERe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in the final length of leaves 3, 4, and 5 was mainly a result of a decrease in their LER.”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
Saline reduction of leaf elongation rate was greater in steady growth than later stages.
- Taxon
- wheat seedlingsTriticum aestivume1
- Organ / stage
- steady growth phasee0
- Treatment
- saline conditionse0
- Outcome
- LERe0
- Direction
- decreasede0
- Comparator
- later stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decreased LER under saline conditions was more pronounced during the steady growth phase and during the light period compared to later stages and to the dark period, respectively.”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
Saline reduction of leaf elongation rate was greater in light than darkness.
- Taxon
- wheat seedlingsTriticum aestivume1
- Treatment
- saline conditionse0
- Outcome
- LERe0
- Direction
- decreasede0
- Qualifier
- the light periode0
- Comparator
- the dark periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decreased LER under saline conditions was more pronounced during the steady growth phase and during the light period compared to later stages and to the dark period, respectively.”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
Salinity affected leaf elongation rate more severely at higher leaf numbers.
- Taxon
- wheat seedlingsTriticum aestivume1
- Organ / stage
- leaf numbere0
- Treatment
- Salinitye0
- Outcome
- LERe0
- Direction
- more severelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity affected the LER more severely with increasing leaf number”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
Reduced leaf elongation rate arose from reduced relative elemental growth rate.
- Taxon
- wheat seedlingsTriticum aestivume1
- Outcome
- LERe0
- Direction
- reductione0
- Qualifier
- decreasing the REGRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in LER resulted from decreasing the REGR”
e1“wheat seedlings (Triticum aestivum L.)”
Claim · model-written summary
The reduction in leaf elongation rate did not arise from shortening of the elongation zone during linear leaf growth.
- Taxon
- wheat seedlingsTriticum aestivume2
- Outcome
- LERe1
- Qualifier
- shortening the length of the leaf elongation zone during the linear phase of leaf growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not result from shortening the length of the leaf elongation zone during the linear phase of leaf growth”
e1“The reduction in LER resulted from decreasing the REGR”
e2“wheat seedlings (Triticum aestivum L.)”
The same questions in other papers
salinity · growth · Triticum aestivum (wheat)Positive and negative results
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