Abstract
Phytotoxicity of aluminum (Al) has become a serious problem in inhibiting plant growth on acid soils. Under Al stress, the changes of rhizosphere pH, root elongation, absorption of Al by wheat roots, organic acids exuded from roots, and some main factors related to Al-tolerant mechanisms have been studied using hydroponics, fluorescence spectrophotometry, and high performance liquid chromatography (HPLC). Two wheat cultivars, Brevor and Atlas66, differing in Al tolerance are chosen in the study. Accordingly, the rhizosphere pH has a positive effect on Al tolerance. Atlas66 (Al-tolerant) has higher capability to maintain high rhizosphere pH than Brevor (Al-sensitive) does. High pH can reduce Al3+ activity and toxicity, and increase the efficiency of exuding organic acids from the roots. More inhibition of root elongation has been found in Brevor because of the exposure of roots to Al3+ solution at low pH. Brevor accumulate more Al in roots than Atlas66 even at higher pH. Al-induced exudation of malic and citric acids has been found in Atlas66 roots, while no Al-induced organic acids have been found in Brevor. These results indicate that the Al-induced secretion of organic acids from Atlas66 roots has a positive correlation with Al tolerance. Comprehensive treatment of Al3+ and H+ indicates that wheat is adversely influenced by excess Al3+, rather than low pH.
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Claims 10
Claim · model-written summary
Rhizosphere pH was positively related to aluminum tolerance.
- Taxon
- Wheat
Triticum aestivumt0 - Outcome
- Al tolerancee0
- Direction
- positivee0
- Qualifier
- rhizosphere pHe0
Not reportedMaterialGeneCompoundOrgan / stageInteractorTreatmentComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rhizosphere pH has a positive effect on Al tolerance”
t0“Wheat”
Claim · model-written summary
Atlas66 maintained higher rhizosphere pH than Brevor.
- Taxon
- WheatTriticum aestivumt0
- Material
- Atlas66e0
- Outcome
- rhizosphere pHe0
- Direction
- highere0
- Comparator
- Brevore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Atlas66 (Al-tolerant) has higher capability to maintain high rhizosphere pH than Brevor (Al-sensitive) does.”
t0“Wheat”
Claim · model-written summary
Higher pH reduced Al3+ activity and toxicity.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- Al3+ activity and toxicitye0
- Direction
- reducee0
- Qualifier
- High pHe0
Not reportedMaterialGeneCompoundOrgan / stageInteractorTreatmentComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High pH can reduce Al3+ activity and toxicity”
t0“Wheat”
Claim · model-written summary
Higher pH increased root organic acid exudation efficiency.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- rootse0
- Outcome
- efficiency of exuding organic acids from the rootse0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High pH can reduce Al3+ activity and toxicity, and increase the efficiency of exuding organic acids from the roots.”
t0“Wheat”
Claim · model-written summary
Brevor had more inhibition of root elongation under Al3+ at low pH.
- Taxon
- WheatTriticum aestivumt0
- Material
- Brevore0
- Treatment
- Al3+ solution at low pHe0
- Outcome
- root elongatione0
- Direction
- More inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“More inhibition of root elongation has been found in Brevor because of the exposure of roots to Al3+ solution at low pH.”
t0“Wheat”
Claim · model-written summary
Brevor accumulated more root aluminum than Atlas66.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Brevor accumulate more Al in roots than Atlas66 even at higher pH.”
t0“Wheat”
Claim · model-written summary
Al induced malic and citric acid exudation in Atlas66 roots.
- Taxon
- WheatTriticum aestivumt0
- Material
- Atlas66e0
- Treatment
- Ale0
- Outcome
- exudation of malic and citric acidse0
- Direction
- Al-inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Al-induced exudation of malic and citric acids has been found in Atlas66 roots”
t0“Wheat”
Claim · model-written summary
Brevor did not show Al-induced organic acid exudation.
- Taxon
- WheatTriticum aestivumt0
- Material
- Brevore0
- Outcome
- Al-induced organic acidse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no Al-induced organic acids have been found in Brevor”
t0“Wheat”
Claim · model-written summary
Organic acid secretion in Atlas66 correlated positively with aluminum tolerance.
- Taxon
- WheatTriticum aestivumt0
- Material
- Atlas66e0
- Outcome
- Al tolerancee0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Al-induced secretion of organic acids from Atlas66 roots has a positive correlation with Al tolerance”
t0“Wheat”
Claim · model-written summary
Excess Al3+ adversely influenced wheat more than low pH.
- Taxon
- wheatTriticum aestivume0
- Treatment
- excess Al3+e0
- Outcome
- wheat is adversely influencede0
- Direction
- adverselye0
- Comparator
- low pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat is adversely influenced by excess Al3+, rather than low pH”
The same questions in other papers
aluminium atom · molecular: metabolites · Triticum aestivum (wheat)Positive and negative results
14 papers in the same direction as this paper · 25 in the opposite direction
- negative
- negative
- no effect
36 papers more in this group
See all 40 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.