Abstract
Soil salinization constrains faba bean (Vicia faba L.) production across North Africa and the Near East. Three Egyptian cultivars, Nubaria 1, Giza 716, and Sakha 5, were subjected to 0, 150, and 200 mM NaCl under controlled greenhouse conditions. Twenty morphological, physiological, and biochemical traits were quantified, along with quantitative RT-PCR profiling of 11 salt-responsive genes. Two-way ANOVA detected significant effects of cultivar, NaCl treatment, and their interaction for a subset of traits, including root length, leaf K⁺ concentration, net photosynthesis, stomatal conductance, intercellular CO₂, and three epicuticular wax fractions, indicating that these traits responded differently to salinity across genotypes. For a separate subset branch number, root dry weight, root-to-shoot ratio, and leaf nitrogen, only the cultivar term was significant, with no detectable effect of treatment or interaction. Nubaria 1 showed the smallest reductions in shoot dry weight (14% at 200 mM NaCl), maintained leaf K⁺ concentration across all salinity levels (13.3-13.6 g kg⁻¹), and retained the highest pod number at 200 mM NaCl (1.78 pods per plant). It also showed the lowest fold induction across all 11 genes at both stress levels. Sakha 5 showed the largest increase in root length under stress, from 3,577 cm in the control to 8,664 cm at 200 mM NaCl (+ 142%), the highest fold-induction across all gene categories, and produced zero pods at 200 mM NaCl in all replicates. Giza 716 had the highest net photosynthetic rate under control conditions (10.33 µmol CO₂ m⁻² s⁻¹) and was intermediate for most traits across treatment levels. In all three cultivars, net photosynthesis declined, and intercellular CO₂ rose simultaneously with increasing NaCl, from 327 to 364 µmol mol⁻¹ under control to 378-413 µmol mol⁻¹ at 200 mM NaCl. Total epicuticular wax reached its maximum at 150 mM NaCl in all cultivars and declined at 200 mM NaCl in Sakha 5 and Giza 716, despite continued CER1 induction in Sakha 5. Principal component analysis explained 70.7% of total variance across two components (PC1: 39.5%; PC2: 31.2%), with cultivar samples remaining separated along PC1 across all treatment levels. Leaf K⁺ concentration and net photosynthesis under stress showed the most consistent differences among cultivars and are identified as practical traits for early-stage phenotyping in salt-tolerance screening programs.
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Claims 19
Claim · model-written summary
Cultivar, NaCl, and their interaction significantly affected root length, leaf potassium, photosynthesis, gas exchange, and wax fractions.
- Taxon
- faba bean
Vicia fabat0 - Treatment
- NaCl treatmente0
- Outcome
- root length, leaf K⁺ concentration, net photosynthesise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant effects of cultivar, NaCl treatment, and their interaction for a subset of traits, including root length, leaf K⁺ concentration, net photosynthesis, stomatal conductance, intercellular CO₂, and three epicuticular wax fractions”
t0“faba beans”
Claim · model-written summary
Branch number, root dry weight, root-to-shoot ratio, and leaf nitrogen varied significantly by cultivar only.
- Taxon
- faba beanVicia fabat0
- Material
- cultivare0
- Outcome
- branch number, root dry weight, root-to-shoot ratio, and leaf nitrogene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“branch number, root dry weight, root-to-shoot ratio, and leaf nitrogen, only the cultivar term was significant, with no detectable effect of treatment or interaction”
t0“faba beans”
Claim · model-written summary
Nubaria 1 had the smallest shoot dry weight reduction at 200 mM NaCl.
- Taxon
- faba beanVicia fabat0
- Material
- Nubaria 1e0
- Treatment
- 200 mM NaCle0
- Outcome
- shoot dry weighte0
- Direction
- smallest reductionse0
- Value
- 14%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nubaria 1 showed the smallest reductions in shoot dry weight (14% at 200 mM NaCl)”
t0“faba beans”
Claim · model-written summary
Nubaria 1 maintained leaf potassium across salinity levels.
- Taxon
- faba beanVicia fabat0
- Material
- Nubaria 1e1
- Treatment
- all salinity levelse0
- Outcome
- leaf K⁺ concentratione0
- Direction
- maintainede0
- Value
- 13.3-13.6 g kg⁻¹e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maintained leaf K⁺ concentration across all salinity levels (13.3-13.6 g kg⁻¹)”
t0“faba beans”
e1“Nubaria 1 showed the smallest reductions in shoot dry weight”
Claim · model-written summary
Nubaria 1 retained the highest pod number at 200 mM NaCl.
- Taxon
- faba beanVicia fabat0
- Material
- Nubaria 1e1
- Treatment
- 200 mM NaCle0
- Outcome
- pod numbere0
- Direction
- higheste0
- Value
- 1.78 pods per plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“retained the highest pod number at 200 mM NaCl (1.78 pods per plant)”
t0“faba beans”
e1“Nubaria 1 showed the smallest reductions in shoot dry weight”
Claim · model-written summary
Nubaria 1 had the lowest induction of all 11 genes at both stress levels.
- Taxon
- faba beanVicia fabat0
- Material
- Nubaria 1e1
- Outcome
- fold induction across all 11 genese0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It also showed the lowest fold induction across all 11 genes at both stress levels”
t0“faba beans”
e1“Nubaria 1 showed the smallest reductions in shoot dry weight”
Claim · model-written summary
Sakha 5 root length rose by 142% under 200 mM NaCl.
- Taxon
- faba beanVicia fabat0
- Material
- Sakha 5e0
- Treatment
- 200 mM NaCle0
- Outcome
- root lengthe0
- Direction
- increasee0
- Value
- + 142%e0
- Qualifier
- 3,577 cme0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sakha 5 showed the largest increase in root length under stress, from 3,577 cm in the control to 8,664 cm at 200 mM NaCl (+ 142%)”
t0“faba beans”
Claim · model-written summary
Sakha 5 had the highest gene fold induction.
- Taxon
- faba beanVicia fabat0
- Material
- Sakha 5e1
- Outcome
- fold-induction across all gene categoriese0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest fold-induction across all gene categories”
t0“faba beans”
e1“Sakha 5 showed the largest increase in root length”
Claim · model-written summary
Sakha 5 produced no pods at 200 mM NaCl.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“produced zero pods at 200 mM NaCl in all replicates”
t0“faba beans”
e1“Sakha 5 showed the largest increase in root length”
Claim · model-written summary
Giza 716 had the highest control photosynthesis rate.
- Taxon
- faba beanVicia fabat0
- Material
- Giza 716e0
- Outcome
- net photosynthetic ratee0
- Direction
- higheste0
- Value
- 10.33 µmol CO₂ m⁻² s⁻¹e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Giza 716 had the highest net photosynthetic rate under control conditions (10.33 µmol CO₂ m⁻² s⁻¹)”
t0“faba beans”
Claim · model-written summary
Giza 716 was intermediate for most traits.
- Taxon
- faba beanVicia fabat0
- Material
- Giza 716e1
- Outcome
- most traitse0
- Direction
- intermediatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was intermediate for most traits across treatment levels”
t0“faba beans”
e1“Giza 716 had the highest net photosynthetic rate”
Claim · model-written summary
Net photosynthesis declined with increasing NaCl in all cultivars.
- Taxon
- faba beanVicia fabat0
- Treatment
- increasing NaCle0
- Outcome
- net photosynthesise0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all three cultivars, net photosynthesis declined, and intercellular CO₂ rose simultaneously with increasing NaCl”
t0“faba beans”
Claim · model-written summary
Intercellular CO₂ rose with increasing NaCl in all cultivars.
- Taxon
- faba beanVicia fabat0
- Treatment
- increasing NaCle0
- Outcome
- intercellular CO₂e0
- Direction
- rosee0
- Value
- 378-413 µmol mol⁻¹e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intercellular CO₂ rose simultaneously with increasing NaCl, from 327 to 364 µmol mol⁻¹ under control to 378-413 µmol mol⁻¹ at 200 mM NaCl”
t0“faba beans”
Claim · model-written summary
Total epicuticular wax peaked at 150 mM NaCl in all cultivars.
- Taxon
- faba beanVicia fabat0
- Treatment
- 150 mM NaCle0
- Outcome
- Total epicuticular waxe0
- Direction
- maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total epicuticular wax reached its maximum at 150 mM NaCl in all cultivars”
t0“faba beans”
Claim · model-written summary
Epicuticular wax declined at 200 mM NaCl in Sakha 5 and Giza 716.
- Taxon
- faba beanVicia fabat0
- Material
- Sakha 5 and Giza 716e0
- Treatment
- 200 mM NaCle0
- Outcome
- epicuticular waxe1
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“declined at 200 mM NaCl in Sakha 5 and Giza 716, despite continued CER1 induction in Sakha 5”
t0“faba beans”
e1“Total epicuticular wax reached its maximum”
Claim · model-written summary
CER1 induction continued in Sakha 5 at 200 mM NaCl.
- Taxon
- faba beanVicia fabat0
- Material
- Sakha 5e0
- Gene
- CER1e0
- Outcome
- CER1 inductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continued CER1 induction in Sakha 5”
t0“faba beans”
Claim · model-written summary
Two PCA components explained 70.7% of trait variance.
- Taxon
- faba beanVicia fabat0
- Outcome
- total variancee0
- Value
- 70.7%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Principal component analysis explained 70.7% of total variance across two components (PC1: 39.5%; PC2: 31.2%)”
t0“faba beans”
Claim · model-written summary
Cultivar samples remained separated on PC1 across treatments.
- Taxon
- faba beanVicia fabat0
- Outcome
- cultivar samples remaining separated along PC1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivar samples remaining separated along PC1 across all treatment levels”
t0“faba beans”
Claim · model-written summary
Leaf potassium and photosynthesis under stress are recommended for early salt-tolerance phenotyping.
- Taxon
- faba beanVicia fabat0
- Outcome
- practical traits for early-stage phenotyping in salt-tolerance screening programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf K⁺ concentration and net photosynthesis under stress showed the most consistent differences among cultivars and are identified as practical traits for early-stage phenotyping in salt-tolerance screening programs”
t0“faba beans”
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See all 10 papers →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.