Abstract
Several recent reports have suggested that boron (B) may alleviate the toxic effects of aluminum (Al) on plant growth, providing improved plant performance on acid soils. To test this hypothesis, an Al-sensitive cultivar of Triticum aestivum L. (cv. Neepawa) was grown in solution culture with 10 concentrations of Al (0–300 μM), in the presence of deficient (0 μM), sufficient (6 μM), luxury (75 μM), or toxic (750 μM) concentrations of B. The effects of both Al and B on the response of roots and leaves to Al was accurately modeled (R 2 < 0.99) using a modified Weibull function. Comparison of best fit function parameters for the response to Al under varying conditions of B supply failed to reveal any evidence of B amelioration of Al toxicity. The combined effects of Al and B were adequately explained by a multiplicative model. Although formation of stable Al-borate complexes could occur in growth solutions under our experimental conditions, varying the supply of B had little effect on accumulation of Al in roots and leaves. In contrast, increasing Al concentrations in solution resulted in increased immobilization of B in roots and decreased accumulation of B in leaves. Growth of plants with elevated B supply resulted in higher concentrations of B in roots and leaves without improving growth. We suggest that previous reports of B amelioration of Al toxicity must reflect the unique characteristics of soil-based media, and (or) differences among species in internal requirements for B and the effects of Al on B nutrition. Key words: amelioration, aluminum, boron, toxicity, Weibull function, wheat.
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Claims 8
Claim · model-written summary
A modified Weibull function accurately modeled Al and B root and leaf responses.
- Taxon
- Triticum aestivum
Triticum aestivume1 - Outcome
- response of roots and leaves to Ale0
- Value
- R 2 < 0.99e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of both Al and B on the response of roots and leaves to Al was accurately modeled (R 2 < 0.99) using a modified Weibull function.”
e1“Triticum aestivum L. (cv. Neepawa)”
Claim · model-written summary
Varying boron supply did not ameliorate aluminum toxicity.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- varying conditions of B supplye0
- Outcome
- B amelioration of Al toxicitye0
- Direction
- failed to reveal any evidencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Comparison of best fit function parameters for the response to Al under varying conditions of B supply failed to reveal any evidence of B amelioration of Al toxicity.”
e1“Triticum aestivum L. (cv. Neepawa)”
Claim · model-written summary
Combined Al and B effects were explained by a multiplicative model.
- Taxon
- Triticum aestivumTriticum aestivume1
- Outcome
- combined effects of Al and Be0
- Comparator
- a multiplicative modele0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined effects of Al and B were adequately explained by a multiplicative model.”
e1“Triticum aestivum L. (cv. Neepawa)”
Claim · model-written summary
Varying B supply had little effect on Al accumulation in roots and leaves.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- varying the supply of Be0
- Outcome
- accumulation of Al in roots and leavese0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“varying the supply of B had little effect on accumulation of Al in roots and leaves.”
e1“Triticum aestivum L. (cv. Neepawa)”
Claim · model-written summary
Increasing solution Al increased B immobilization in roots.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- increasing Al concentrations in solutione0
- Outcome
- immobilization of B in rootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing Al concentrations in solution resulted in increased immobilization of B in roots”
e1“Triticum aestivum L. (cv. Neepawa)”
Claim · model-written summary
Increasing solution Al decreased B accumulation in leaves.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- increasing Al concentrations in solutione0
- Outcome
- accumulation of B in leavese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing Al concentrations in solution resulted in increased immobilization of B in roots and decreased accumulation of B in leaves.”
e1“Triticum aestivum L. (cv. Neepawa)”
Claim · model-written summary
Elevated B supply increased B concentrations in roots and leaves.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- elevated B supplye0
- Outcome
- concentrations of B in roots and leavese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth of plants with elevated B supply resulted in higher concentrations of B in roots and leaves without improving growth.”
e1“Triticum aestivum L. (cv. Neepawa)”
Claim · model-written summary
Elevated B supply did not improve growth.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- elevated B supplye0
- Outcome
- growthe0
- Direction
- without improvinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth of plants with elevated B supply resulted in higher concentrations of B in roots and leaves without improving growth.”
e1“Triticum aestivum L. (cv. Neepawa)”
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