Abstract
Seedlings growing in acid soils suffer both phosphorus (P) deficiency and aluminium (Al) toxicity stresses. An experiment was conducted to study the effects of Al and P interaction on Al-tolerant (ET8) and Al-sensitive (ES8) wheat genotypes in an acid soil. This study aimed to determine the interactive effect of Al and P in soil and within plant tissue. Three Al levels (0, 50 and 150 mg aluminium chloride [AlCl3] kg−1 soil) and five P levels (0, 20, 40, 80 and 160 mg P kg−1) were used in this experiment. Bulk soil pH decreased with addition of AlCl3 to the soil. Bulk soil pH increased at 160 mg P kg−1 supply at three Al levels. Phosphorus supply reduced extractable Al in the soil in all Al treatments. Seedlings suffered more from Al toxicity in the absence of P supply. Increasing P supply resulted in increased seedling biomass under high Al toxicity. This high P ameliorated Al toxicity in the soil and may enhance ES8 growth under Al toxicity. The Al × P interaction affected the root and shoot P concentration in both genotypes and P supply had no effect on P translocation to the shoot. These results suggested that differential growth behaviour between ES8 and ET8 plays an important role in tolerance to Al toxicity irrespective of high P supply. It is concluded that the higher aluminium cation (Al3+) binding capacity in the root apoplast of ET8 seedlings contributes to its improved tolerance to Al toxicity compared to ES8 seedlings.
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Claims 8
Claim · model-written summary
AlCl3 addition decreased bulk soil pH.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- addition of AlCl3e0
- Outcome
- Bulk soil pHe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bulk soil pH decreased with addition of AlCl3 to the soil.”
t0“wheat”
Claim · model-written summary
Phosphorus at 160 mg P kg−1 increased bulk soil pH at three aluminum levels.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 160 mg P kg−1 supplye0
- Outcome
- Bulk soil pHe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bulk soil pH increased at 160 mg P kg−1 supply at three Al levels.”
t0“wheat”
Claim · model-written summary
Phosphorus supply reduced extractable soil aluminum in every aluminum treatment.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Phosphorus supplye0
- Outcome
- extractable Al in the soile0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus supply reduced extractable Al in the soil in all Al treatments.”
t0“wheat”
Claim · model-written summary
Without phosphorus supply, seedlings suffered more aluminum toxicity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- absence of P supplye0
- Outcome
- Al toxicitye0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings suffered more from Al toxicity in the absence of P supply.”
t0“wheat”
Claim · model-written summary
Increasing phosphorus supply increased seedling biomass under high aluminum toxicity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Increasing P supplye0
- Outcome
- seedling biomasse0
- Direction
- increasede0
- Qualifier
- high Al toxicitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing P supply resulted in increased seedling biomass under high Al toxicity.”
t0“wheat”
Claim · model-written summary
The aluminum by phosphorus interaction affected root and shoot phosphorus concentrations.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Al × P interactione0
- Outcome
- root and shoot P concentratione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Al × P interaction affected the root and shoot P concentration in both genotypes”
t0“wheat”
Claim · model-written summary
Phosphorus supply had no effect on phosphorus translocation to shoots.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- P supplye0
- Outcome
- P translocation to the shoote0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P supply had no effect on P translocation to the shoot.”
t0“wheat”
Claim · model-written summary
Higher aluminum binding in the ET8 root apoplast was proposed to contribute to its improved tolerance relative to ES8.
- Taxon
- wheatTriticum aestivumt0
- Material
- ET8e0
- Organ / stage
- root apoplaste0
- Outcome
- improved tolerance to Al toxicitye0
- Comparator
- ES8 seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher aluminium cation (Al3+) binding capacity in the root apoplast of ET8 seedlings contributes to its improved tolerance to Al toxicity compared to ES8 seedlings.”
t0“wheat”
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