Abstract
As the plant hormone abscisic acid (ABA) is involved in responses to salinity stress. We tested its putative relationship with the degree of tolerance to this abiotic stress. For this purpose we have examined the responses of sensitive (IR29) and tolerant (IR651) varieties of indica rice (Oryza sativa L.) to a range of salinity (0 (control) and 100 mM NaCl). Shoot and root dry weight was reduced and leaf Na concentration increased in response to salinity for both cultivars with a bigger extent in sensitive. Tolerance of IR29 to saline stress was generally improved by ABA treatment and leaves Na content reduced to their respective control treatment. This ABA effect was evident in IR29 with low tolerance, as their ability to recover from stress increased up to seven fold. Independent of the saline treatment, the absolute endogenous leaf ABA content in sensitive variety was significantly more than tolerant one. However, upon stress, the increase in endogenous ABA synthesis was higher in tolerant than in sensitive varieties. These data together with those obtained by using Fluridone, an inhibitor of ABA synthesis, suggested first, there was differential sensitivity to ABA in the tolerant and sensitive leaves cultivars and enhanced concentrations at tolerant levels acted primarily to maintain root and shoot growth salt stress and second, the differences in the level of tolerance to saline stress is related to their different capacity of ABA synthesis under stress conditions. Key words: Abscisic acid, fluridone, Oryza sativa L., salinity, stress tolerance.
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Claims 10
Claim · model-written summary
Salinity reduced shoot and root dry weight in both cultivars, more in the sensitive cultivar.
- Taxon
- rice
Oryza sativat0 - Treatment
- 100 mM NaCle1
- Outcome
- Shoot and root dry weighte0
- Direction
- reducede0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot and root dry weight was reduced and leaf Na concentration increased in response to salinity for both cultivars with a bigger extent in sensitive.”
e1“0 (control) and 100 mM NaCl”
t0“rice”
Claim · model-written summary
Salinity increased leaf Na concentration in both cultivars, more in the sensitive cultivar.
- Taxon
- riceOryza sativat0
- Treatment
- 100 mM NaCle1
- Outcome
- leaf Na concentratione0
- Direction
- increasede0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot and root dry weight was reduced and leaf Na concentration increased in response to salinity for both cultivars with a bigger extent in sensitive.”
e1“0 (control) and 100 mM NaCl”
t0“rice”
Claim · model-written summary
ABA treatment generally improved IR29 saline stress tolerance.
- Taxon
- riceOryza sativat0
- Material
- IR29e0
- Treatment
- ABA treatmente0
- Outcome
- Tolerance of IR29 to saline stresse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tolerance of IR29 to saline stress was generally improved by ABA treatment”
t0“rice”
Claim · model-written summary
ABA treatment reduced leaf Na content of IR29 to its control level.
- Taxon
- riceOryza sativat0
- Material
- IR29e1
- Treatment
- ABA treatmente1
- Outcome
- leaves Na contente0
- Direction
- reducede0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves Na content reduced to their respective control treatment.”
e1“Tolerance of IR29 to saline stress was generally improved by ABA treatment”
t0“rice”
Claim · model-written summary
ABA increased IR29 recovery from saline stress up to sevenfold.
- Taxon
- riceOryza sativat0
- Material
- IR29e0
- Treatment
- ABAe0
- Outcome
- ability to recover from stresse0
- Direction
- increasede0
- Value
- seven folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This ABA effect was evident in IR29 with low tolerance, as their ability to recover from stress increased up to seven fold.”
t0“rice”
Claim · model-written summary
Sensitive rice had significantly greater absolute endogenous leaf ABA content than tolerant rice, independent of salinity.
- Taxon
- riceOryza sativat0
- Outcome
- absolute endogenous leaf ABA contente0
- Direction
- moree0
- Comparator
- tolerant onee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Independent of the saline treatment, the absolute endogenous leaf ABA content in sensitive variety was significantly more than tolerant one.”
t0“rice”
Claim · model-written summary
Under stress, endogenous ABA synthesis increased more in tolerant than sensitive rice.
- Taxon
- riceOryza sativat0
- Outcome
- endogenous ABA synthesise0
- Direction
- highere0
- Comparator
- sensitive varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, upon stress, the increase in endogenous ABA synthesis was higher in tolerant than in sensitive varieties.”
t0“rice”
Claim · model-written summary
The authors infer different ABA sensitivity between tolerant and sensitive rice leaves.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese0
- Outcome
- differential sensitivity to ABAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was differential sensitivity to ABA in the tolerant and sensitive leaves cultivars”
t0“rice”
Claim · model-written summary
The authors infer that enhanced ABA concentrations maintain root and shoot growth under salt stress.
- Taxon
- riceOryza sativat0
- Outcome
- root and shoot growthe0
- Qualifier
- enhanced concentrations at tolerant levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhanced concentrations at tolerant levels acted primarily to maintain root and shoot growth salt stress”
t0“rice”
Claim · model-written summary
The authors relate differences in rice salinity tolerance to ABA synthesis capacity under stress.
- Taxon
- riceOryza sativat0
- Compound
- ABAe0
- Outcome
- level of tolerance to saline stresse0
- Qualifier
- different capacity of ABA synthesise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the differences in the level of tolerance to saline stress is related to their different capacity of ABA synthesis under stress conditions.”
t0“rice”
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