Abstract
In the present study, a pair of near iso-genic wheat line, ET8 and ES8, was used to investigate the effects of aluminum (Al) stress on root growth, root tip Al content, root tip cytoplasmic protein, and malate efflux from their roots. Root elongation was decreased with increasing Al concentrations applied, but it was always higher in ET8 than in ES8, indicating high Al tolerance in ET8. Total Al content in root tips was significantly lower in ET8 than in ES8 suggesting the role of Al exclusion mechanism in Al tolerance of ET8. After 50 #mu#mol/L Al exposure for 24 h, SDS-PAGE cytoplasmic protein profiles in root tips were severely affected in ES8 but not in ET8. Furthermore, Al-induced malate efflux was significantly higher in ET8 than in ES8, indicating that exclusion of Al from root tips is due to efflux of malate from wheat roots. Although ET8 was higher in Al tolerance than ES8, the root growth was still inhibited by 50 #mu#mol/L Al exposure for 24 h. We hypothesise that Al may inhibit root elongation apoplastically rather than cytoplasitically.
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Claims 9
Claim · model-written summary
Root elongation fell as aluminum concentration increased.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- Al concentrationse0
- Outcome
- Root elongatione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root elongation was decreased with increasing Al concentrations applied”
e1“wheat line, ET8 and ES8”
Claim · model-written summary
ET8 maintained higher root elongation than ES8 under aluminum exposure.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was always higher in ET8 than in ES8, indicating high Al tolerance in ET8”
e1“Root elongation was decreased with increasing Al concentrations applied”
e2“wheat line, ET8 and ES8”
Claim · model-written summary
ET8 root tips contained significantly less aluminum than ES8 root tips.
- Taxon
- wheatTriticum aestivume1
- Material
- ET8e0
- Organ / stage
- root tipse0
- Outcome
- Total Al contente0
- Direction
- lowere0
- Comparator
- ES8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total Al content in root tips was significantly lower in ET8 than in ES8”
e1“wheat line, ET8 and ES8”
Claim · model-written summary
Aluminum exposure severely changed ES8 root-tip cytoplasmic protein profiles.
- Taxon
- wheatTriticum aestivume1
- Material
- ES8e0
- Organ / stage
- root tipse0
- Treatment
- 50 #mu#mol/L Al exposure for 24 he0
- Outcome
- SDS-PAGE cytoplasmic protein profilese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 50 #mu#mol/L Al exposure for 24 h, SDS-PAGE cytoplasmic protein profiles in root tips were severely affected in ES8”
e1“wheat line, ET8 and ES8”
Claim · model-written summary
The same exposure did not severely change ET8 root-tip protein profiles.
- Taxon
- wheatTriticum aestivume2
- Material
- ET8e0
- Treatment
- 50 #mu#mol/L Al exposure for 24 he1
- Outcome
- SDS-PAGE cytoplasmic protein profilese0
- Direction
- note0
- Comparator
- ES8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SDS-PAGE cytoplasmic protein profiles in root tips were severely affected in ES8 but not in ET8”
e1“After 50 #mu#mol/L Al exposure for 24 h”
e2“wheat line, ET8 and ES8”
Claim · model-written summary
Aluminum induced significantly greater malate efflux in ET8 than ES8.
- Taxon
- wheatTriticum aestivume1
- Material
- ET8e0
- Outcome
- Al-induced malate effluxe0
- Direction
- highere0
- Comparator
- ES8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Al-induced malate efflux was significantly higher in ET8 than in ES8”
e1“wheat line, ET8 and ES8”
Claim · model-written summary
Authors interpreted malate efflux as explaining aluminum exclusion from wheat root tips.
- Taxon
- wheatTriticum aestivume0
- Outcome
- exclusion of Al from root tipse0
- Qualifier
- efflux of malate from wheat rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exclusion of Al from root tips is due to efflux of malate from wheat roots”
Claim · model-written summary
ET8 root growth remained inhibited after 50 #mu#mol/L aluminum for 24 hours.
- Taxon
- wheatTriticum aestivume1
- Material
- ET8e1
- Treatment
- 50 #mu#mol/L Al exposure for 24 he0
- Outcome
- root growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth was still inhibited by 50 #mu#mol/L Al exposure for 24 h”
e1“wheat line, ET8 and ES8”
Claim · model-written summary
Authors hypothesized apoplastic rather than cytoplasmic inhibition of root elongation by aluminum.
- Taxon
- wheatTriticum aestivume1
- Outcome
- root elongatione0
- Qualifier
- apoplastically rather than cytoplasiticallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Al may inhibit root elongation apoplastically rather than cytoplasitically”
e1“wheat line, ET8 and ES8”
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