Abstract
Abiotic stress prevents plants from absorbing available nutrients resulting in yield loss and soil contamination. Growth regulators like gibberellic acid (GA) may improve plant growth under stress conditions. This study was conducted to evaluate the role of GA on the rice performance under saline conditions and to investigate its effects on regulatory gene expression by GA-mediated seed priming. Seeds of rice variety KSK 282 were primed in GA solution (0, 50, 100 and 150 ppm) and grown under different salt (NaCl) concentrations (0, 50, 100 and 150 mM). Increase in salt concentration led to decrease in rice growth. GA priming reversed the negative effects of salt stress and enhanced different growth attributes like germination, seedling growth and weight, while decreased the concentration of toxic ions such as Na + in some treatments. However, GA priming was not very effective on Chlorophyll a, b (Chl-a, Chl-b) and total carotene contents. Reverse transcription polymerase chain reaction (RT-PCR) approach was used to study the effect of GA-mediated seed priming on the expression of two stress responsive genes, OsZat 12-1 (LOC_Os01g62130 also called ZOS1-14 -C2H2 zinc finger protein) and OsZat 12-9 (LOC_Os01g62190 also called ZOS1-15 -C2H2 zinc finger protein). There was no or very low expression of OsZat 12-1 and OsZat 12-9 in hydroprimed seeds under all salt stress conditions tested, while induction of gene expression was observed for plants raised from GA primed seeds under salt stress. In conclusion, GA regulated the growth at early stages of rice life cycle by inducing regulatory genes expression; therefore it is noteworthy that while studying salinity factor, the induction of genetic determinants (genes) by plant growth regulators should also be considered.
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Claims 8
Claim · model-written summary
Increasing salt concentration decreased rice growth.
- Taxon
- rice
Oryza sativae0 - Treatment
- salt concentratione0
- Outcome
- rice growthe0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase in salt concentration led to decrease in rice growth.”
Claim · model-written summary
GA priming enhanced rice germination, seedling growth and weight under salt stress.
- Taxon
- RiceOryza sativat0
- Treatment
- GA priminge0
- Outcome
- germination, seedling growth and weighte0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA priming reversed the negative effects of salt stress and enhanced different growth attributes like germination, seedling growth and weight”
t0“Rice”
Claim · model-written summary
GA priming decreased toxic Na + ion concentration in some treatments.
- Taxon
- RiceOryza sativat0
- Treatment
- GA priminge1
- Outcome
- concentration of toxic ions such as Na +e0
- Direction
- decreasede0
- Qualifier
- in some treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while decreased the concentration of toxic ions such as Na + in some treatments”
t0“Rice”
e1“GA priming reversed the negative effects of salt stress and enhanced different growth attributes like germination, seedling growth and weight”
Claim · model-written summary
GA priming was not very effective on chlorophyll a, b and total carotene contents.
- Taxon
- RiceOryza sativat0
- Treatment
- GA priminge0
- Outcome
- Chlorophyll a, b (Chl-a, Chl-b) and total carotene contentse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA priming was not very effective on Chlorophyll a, b (Chl-a, Chl-b) and total carotene contents.”
t0“Rice”
Claim · model-written summary
OsZat 12-1 and OsZat 12-9 had no or very low expression in hydroprimed rice seeds across tested salt stress conditions.
- Taxon
- RiceOryza sativat0
- Treatment
- hydroprimede0
- Gene
- OsZat 12-1 and OsZat 12-9e0
- Outcome
- no or very low expressione0
- Qualifier
- under all salt stress conditions testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no or very low expression of OsZat 12-1 and OsZat 12-9 in hydroprimed seeds under all salt stress conditions tested”
t0“Rice”
Claim · model-written summary
GA priming induced stress responsive gene expression in rice under salt stress.
- Taxon
- RiceOryza sativat0
- Treatment
- GA primed seedse0
- Outcome
- gene expressione0
- Direction
- inductione0
- Qualifier
- under salt stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“induction of gene expression was observed for plants raised from GA primed seeds under salt stress”
t0“Rice”
Claim · model-written summary
The authors interpret GA as regulating early rice growth by inducing regulatory gene expression.
- Taxon
- riceOryza sativae0
- Outcome
- growth at early stagese0
- Qualifier
- by inducing regulatory genes expressione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA regulated the growth at early stages of rice life cycle by inducing regulatory genes expression”
Claim · model-written summary
The authors recommend considering induction of genes by plant growth regulators when studying salinity.
- Taxon
- RiceOryza sativat0
- Outcome
- induction of genetic determinants (genes) by plant growth regulators should also be considerede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while studying salinity factor, the induction of genetic determinants (genes) by plant growth regulators should also be considered”
t0“Rice”
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