Abstract
Leaf shape can reflect the survival and development of plants in different environments. In particular, leaf area, showing a scaling relationship with other leaf-shape indices, has been used to evaluate the extent of salt stress on plants. Based on the scaling relationships between leaf area and other leaf-shape indices in experiments at different levels of salt stress, we could examine which leaf-shape indices are also related to salt stress. In the present study, we explored the effects of different salt concentration treatments on leaf dry mass per unit area (LMA), the quotient of leaf perimeter and leaf area (QPA), the quotient of leaf width and length (QWL), the areal quotient (AQ) of left and right sides of a leaf and the standardized index (SI) for bilateral symmetry. We treated Pyrus betulifolia Bunge under NaCl salt solution of 2‰, 4‰ and 6‰, respectively, with fresh water with no salt as the control. The reduced major axis (RMA) was used to fit a linear relationship of the log-transformed data between any leaf trait measures and leaf area. We found that leaf fresh weight and dry weight decrease with salt concentration increasing, whereas the exponents of leaf dry weight versus leaf area exhibit an increasing trend, which implies that the leaves expanding in higher salt environments are prone to have a higher cost of dry mass investment to increase per unit leaf area than those in lower salt environments. Salt concentration has a significant influence on leaf shape especially QWL, and QWL under 6‰ concentration treatment is significantly greater than the other treatments. However, there is no a single increasing or decreasing trend for the extent of leaf bilateral symmetry with salt concentration increasing. In addition, we found that the scaling exponents of QPA versus leaf area for four treatments have no significant difference. It indicates that the scaling relationship of leaf perimeter versus leaf area did not change with salt concentration increasing. The present study suggests that salt stress can change leaf functional traits especially the scaling relationship of leaf dry weight versus leaf area and QWL, however, it does not significantly affect the scaling relationships between leaf morphological measures (including QPA and the extent of leaf bilateral symmetry) and leaf area.
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Claims 8
Claim · model-written summary
Leaf fresh weight decreased with increasing salt concentration.
- Taxon
- Pyrus betulifolia Bunge
._-_Budapest_XI._ker%C3%BClet.JPG?width=60)
Pyrus betulifoliat0 - Treatment
- salt concentratione0
- Outcome
- leaf fresh weight and dry weight decrease with salt concentration increasinge0
- Direction
- decreasee0
Not reportedSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
._-_Budapest_XI._ker%C3%BClet.JPG?width=500)
Verbatim
e0“leaf fresh weight and dry weight decrease with salt concentration increasing”
t0“Pyrus betulifolia Bunge”
Claim · model-written summary
Leaf dry weight decreased with increasing salt concentration.
- Taxon
- Pyrus betulifolia BungePyrus betulifoliat0
- Treatment
- salt concentratione0
- Outcome
- leaf fresh weight and dry weight decrease with salt concentration increasinge0
- Direction
- decreasee0
Not reportedSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf fresh weight and dry weight decrease with salt concentration increasing”
t0“Pyrus betulifolia Bunge”
Claim · model-written summary
The exponent of leaf dry weight versus area increased with salt concentration.
- Taxon
- Pyrus betulifolia BungePyrus betulifoliat0
- Outcome
- the exponents of leaf dry weight versus leaf area exhibit an increasing trende0
- Direction
- increasinge0
Not reportedTreatmentSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the exponents of leaf dry weight versus leaf area exhibit an increasing trend”
t0“Pyrus betulifolia Bunge”
Claim · model-written summary
Salt concentration significantly influenced leaf shape, especially QWL.
- Taxon
- Pyrus betulifolia BungePyrus betulifoliat0
- Treatment
- Salt concentratione0
- Outcome
- Salt concentration has a significant influence on leaf shape especially QWLe0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt concentration has a significant influence on leaf shape especially QWL”
t0“Pyrus betulifolia Bunge”
Claim · model-written summary
QWL at 6‰ was greater than under other treatments.
- Taxon
- Pyrus betulifolia BungePyrus betulifoliat0
- Treatment
- 6‰ concentration treatmente0
- Outcome
- QWL under 6‰ concentration treatment is significantly greater than the other treatmentse0
- Direction
- greatere0
- Comparator
- the other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“QWL under 6‰ concentration treatment is significantly greater than the other treatments”
t0“Pyrus betulifolia Bunge”
Claim · model-written summary
Bilateral symmetry showed no single monotonic trend with salt concentration.
- Taxon
- Pyrus betulifolia BungePyrus betulifoliat0
- Treatment
- salt concentratione0
- Outcome
- there is no a single increasing or decreasing trend for the extent of leaf bilateral symmetry with salt concentration increasinge0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is no a single increasing or decreasing trend for the extent of leaf bilateral symmetry with salt concentration increasing”
t0“Pyrus betulifolia Bunge”
Claim · model-written summary
QPA versus area exponents did not differ significantly among treatments.
- Taxon
- Pyrus betulifolia BungePyrus betulifoliat0
- Treatment
- four treatmentse0
- Outcome
- the scaling exponents of QPA versus leaf area for four treatments have no significant differencee0
- Direction
- no significant differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the scaling exponents of QPA versus leaf area for four treatments have no significant difference”
t0“Pyrus betulifolia Bunge”
Claim · model-written summary
The perimeter versus area scaling relationship did not change with increasing salt.
- Taxon
- Pyrus betulifolia BungePyrus betulifoliat0
- Treatment
- salt concentratione0
- Outcome
- the scaling relationship of leaf perimeter versus leaf area did not change with salt concentration increasinge0
- Direction
- did not changee0
Not reportedSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the scaling relationship of leaf perimeter versus leaf area did not change with salt concentration increasing”
t0“Pyrus betulifolia Bunge”