Abstract
Abstract Two rice genotypes, aluminum (Al)‐tolerant Co 37 and Al‐susceptible ADT 36, were evaluated for their physiological responses in the presence of Al stress in a hydroculture experiment. Two levels of Al (0 and 222 μmol/L) were supplied in the nutrient solution and the two rice genotypes were subjected to Al for two weeks. Root growth parameters, relative growth reduction in roots (RGRR), effects of calcium (Ca2+) nitrate metabolism, Al content in roots, and pH shift patterns were recorded. The Al treatments had a lesser effect on Co 37 in terms of reduction in root growth and root dry matter production as compared to ADT 36. While Co 37 did not show significant differences in response to various levels of Ca2+ added in the medium under Al stress, ADT 36 registered a dose‐dependent effect in circumventing the injurious effects of Al. Further, reduction in nitrate content and in vivo nitrate reductase (NR) activity in the leaf tissue in Co 37 under Al treatment was less than that in ADT 36. Moreover, Co 37 had a lower content of Al in its root tissue than did ADT 36. Co 37 was also able to shift the pH of the medium more efficiently than ADT 36, thereby minimizing the uptake of Al, and eventually reducing Al toxicity. The higher level of tolerance to Al of Co 37 seems to have emanated from an efficient nitrate metabolism and its capacity to shift the pH of the medium. It is also evident that Al toxicity in ADT 36 can be circumvented by a Ca treatment to a considerable extent. Our results offer a possible physiological basis for Al tolerance in crop plants.
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Claims 9
Claim · model-written summary
Aluminum reduced root growth less in Co 37 than ADT 36.
- Taxon
- rice
Oryza sativat0 - Material
- Co 37e0
- Treatment
- Al treatmentse0
- Outcome
- root growthe0
- Direction
- lesser effecte0
- Comparator
- ADT 36e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Al treatments had a lesser effect on Co 37 in terms of reduction in root growth and root dry matter production as compared to ADT 36”
t0“rice”
Claim · model-written summary
Aluminum reduced root dry matter less in Co 37 than ADT 36.
- Taxon
- riceOryza sativat0
- Material
- Co 37e0
- Treatment
- Al treatmentse0
- Outcome
- root dry matter productione0
- Direction
- lesser effecte0
- Comparator
- ADT 36e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Al treatments had a lesser effect on Co 37 in terms of reduction in root growth and root dry matter production as compared to ADT 36”
t0“rice”
Claim · model-written summary
Calcium levels did not significantly differentiate Co 37 responses under aluminum stress.
- Taxon
- riceOryza sativat0
- Material
- Co 37e0
- Treatment
- various levels of Ca2+ added in the mediume0
- Outcome
- responsee0
- Direction
- did not show significant differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Co 37 did not show significant differences in response to various levels of Ca2+ added in the medium under Al stress”
t0“rice”
Claim · model-written summary
Calcium showed a dose-dependent mitigation of aluminum injury in ADT 36.
- Taxon
- riceOryza sativat0
- Material
- ADT 36e0
- Treatment
- Ca2+t1
- Outcome
- injurious effects of Ale0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ADT 36 registered a dose‐dependent effect in circumventing the injurious effects of Al”
t0“rice”
t1“various levels of Ca2+ added in the medium under Al stress”
Claim · model-written summary
Aluminum reduced leaf nitrate content less in Co 37 than ADT 36.
- Taxon
- riceOryza sativat0
- Material
- Co 37e0
- Organ / stage
- leaf tissuee0
- Treatment
- Al treatmente0
- Outcome
- nitrate contente0
- Direction
- less thane0
- Comparator
- ADT 36e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction in nitrate content and in vivo nitrate reductase (NR) activity in the leaf tissue in Co 37 under Al treatment was less than that in ADT 36”
t0“rice”
Claim · model-written summary
Aluminum reduced leaf nitrate reductase activity less in Co 37 than ADT 36.
- Taxon
- riceOryza sativat0
- Material
- Co 37e0
- Organ / stage
- leaf tissuee0
- Treatment
- Al treatmente0
- Gene
- nitrate reductase (NR)e0
- Outcome
- in vivo nitrate reductase (NR) activitye0
- Direction
- less thane0
- Comparator
- ADT 36e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction in nitrate content and in vivo nitrate reductase (NR) activity in the leaf tissue in Co 37 under Al treatment was less than that in ADT 36”
t0“rice”
Claim · model-written summary
Co 37 roots contained less aluminum than ADT 36 roots.
- Taxon
- riceOryza sativat0
- Material
- Co 37e0
- Organ / stage
- root tissuee0
- Outcome
- content of Al in its root tissuee0
- Direction
- lowere0
- Comparator
- ADT 36e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Co 37 had a lower content of Al in its root tissue than did ADT 36”
t0“rice”
Claim · model-written summary
Co 37 shifted medium pH more efficiently than ADT 36.
- Taxon
- riceOryza sativat0
- Material
- Co 37e0
- Outcome
- pH of the mediume0
- Direction
- more efficientlye0
- Comparator
- ADT 36e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Co 37 was also able to shift the pH of the medium more efficiently than ADT 36”
t0“rice”
Claim · model-written summary
The authors attribute Co 37 aluminum tolerance to nitrate metabolism and medium pH shifts.
- Taxon
- riceOryza sativat0
- Material
- Co 37e0
- Outcome
- tolerance to Ale0
- Qualifier
- efficient nitrate metabolism and its capacity to shift the pH of the mediume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher level of tolerance to Al of Co 37 seems to have emanated from an efficient nitrate metabolism and its capacity to shift the pH of the medium”
t0“rice”
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