Abstract
Abstract Plants in arid or semiarid areas often experience simultaneous salt and boron (B) stress. Interactive effects on stress responses have been clearly established, but results are inconsistent and variably indicate antagonistic or synergistic interactions even within the same plant species. In this study, five differently B‐ and salt‐resistant wheat genotypes were grown hydroponically at low and high B supply. The effect of increasing NaCl salinity on plant growth, boron uptake rates, shoot B concentrations, and transpiration was determined under both B regimes. The interactive effect of salt and B was different under low and high B supply. Boron‐uptake rates were reduced with increasing salt concentration only under high B supply, and reductions correlated significantly with decreases in leaf area and shoot B concentrations. Under low B supply, however, salt‐induced effects on B‐uptake rates were variable and not significantly correlated with leaf‐area reductions. These results suggest that under high B supply, when B uptake is predominantly passive by diffusion or channel‐mediated via aquaporins, transpiration‐driven water flow is the dominant factor for B accumulation in arial plant parts. Under low B supply, when a significant portion of B can be taken up via active pathways, transpiration is not the decisive factor for B accumulation. Under these conditions, the salt sensitivity of a genotype is a modifying factor of salt–B interactions, because salt‐induced growth inhibition can result in a concentration effect, offset the reduction of B‐uptake rates, and result in increased shoot B concentrations. Contradictory reports on the nature of salt–B interactions might in part be related to low levels of B supply chosen as control treatments and concomittant differences in predominant B‐uptake pathways.
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Claims 9
Claim · model-written summary
Salt and boron interacted differently under low and high boron supply.
- Taxon
- wheat
Triticum aestivume1 - Outcome
- interactive effect of salt and Be0
- Qualifier
- different under low and high B supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interactive effect of salt and B was different under low and high B supply”
e1“wheat genotypes”
Claim · model-written summary
Increasing salt reduced boron uptake rates only under high boron supply.
- Taxon
- wheatTriticum aestivume1
- Treatment
- increasing salt concentratione0
- Outcome
- Boron‐uptake ratese0
- Direction
- reducede0
- Qualifier
- only under high B supplye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Boron‐uptake rates were reduced with increasing salt concentration only under high B supply”
e1“wheat genotypes”
Claim · model-written summary
Under high boron supply, lower boron uptake correlated with reduced leaf area.
- Taxon
- wheatTriticum aestivume2
- Organ / stage
- leaf areae0
- Outcome
- Boron‐uptake ratese1
- Direction
- reducede1
- Qualifier
- decreases in leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reductions correlated significantly with decreases in leaf area and shoot B concentrations”
e1“Boron‐uptake rates were reduced with increasing salt concentration only under high B supply”
e2“wheat genotypes”
Claim · model-written summary
Under high boron supply, lower boron uptake correlated with lower shoot boron concentrations.
- Taxon
- wheatTriticum aestivume2
- Organ / stage
- shoote0
- Outcome
- Boron‐uptake ratese1
- Direction
- reducede1
- Qualifier
- decreases in leaf area and shoot B concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reductions correlated significantly with decreases in leaf area and shoot B concentrations”
e1“Boron‐uptake rates were reduced with increasing salt concentration only under high B supply”
e2“wheat genotypes”
Claim · model-written summary
Under low boron supply, salt effects on boron uptake varied.
- Taxon
- wheatTriticum aestivume1
- Outcome
- B‐uptake ratese0
- Qualifier
- Under low B supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low B supply, however, salt‐induced effects on B‐uptake rates were variable”
e1“wheat genotypes”
Claim · model-written summary
Under low boron supply, boron uptake and leaf area reductions were not significantly correlated.
- Taxon
- wheatTriticum aestivume2
- Organ / stage
- leaf‐areae0
- Outcome
- B‐uptake ratese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“not significantly correlated with leaf‐area reductions”
e1“Under low B supply, however, salt‐induced effects on B‐uptake rates were variable”
e2“wheat genotypes”
Claim · model-written summary
Under high boron supply, transpiration-driven water flow was inferred to dominate boron accumulation in aerial parts.
- Taxon
- wheatTriticum aestivume1
- Outcome
- B accumulation in arial plant partse0
- Qualifier
- transpiration‐driven water flowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under high B supply, when B uptake is predominantly passive by diffusion or channel‐mediated via aquaporins, transpiration‐driven water flow is the dominant factor for B accumulation in arial plant parts”
e1“wheat genotypes”
Claim · model-written summary
Under low boron supply, transpiration was inferred not to decide boron accumulation.
- Taxon
- wheatTriticum aestivume1
- Outcome
- B accumulatione0
- Qualifier
- transpiration is not the decisive factore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low B supply, when a significant portion of B can be taken up via active pathways, transpiration is not the decisive factor for B accumulation”
e1“wheat genotypes”
Claim · model-written summary
Under low boron supply, genotype salt sensitivity modified salt–boron interactions.
- Taxon
- wheatTriticum aestivume1
- Material
- genotypee0
- Outcome
- salt–B interactionse0
- Qualifier
- salt‐induced growth inhibition can result in a concentration effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the salt sensitivity of a genotype is a modifying factor of salt–B interactions, because salt‐induced growth inhibition can result in a concentration effect, offset the reduction of B‐uptake rates, and result in increased shoot B concentrations”
e1“wheat genotypes”
The same questions in other papers
salinity · nutrient: content · Triticum aestivum (wheat)Positive and negative results
65 papers in the same direction as this paper · 19 in the opposite direction
- positive
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