Abstract
Background: A drought-tolerant genotype should be identified and improved for the continuity of food security because of the global importance of rice. Mutation and tissue culture techniques are effective and important for studies on the development of potential rice resources. The effects of irradiation and drought stress on rice genotype MR269 of Oryza sativa L., differing in drought tolerance capability were investigated. Methodology: The seeds of the genotypes were exposed to gamma rays at 350 Gy. Naked seeds were initiated onto half-strength standard MS medium enhanced with 0, 10 and 20% polyethylene glycol (PEG) 6000. The effects of PEG on root and shoot length, fresh and dry seedling weights, total chlorophyll and carbohydrate contents and proline accumulation were examined. Significant differences were observed in the studied traits. The non-irradiated seeds presented the highest mean shoot and seedling fresh weight, whereas the irradiated seeds presented the largest root length and highest proline concentrations. Results: The PEG produced a decrease in the means of all the characteristics investigated by enhancing PEG concentration, except for the means of proline content, which increased with the increase in PEG concentration. The irradiated genotypes produced the highest values of root length, dry weight, chlorophyll, proline and carbohydrates in concentrations of 20% PEG compared with the non-irradiated ones. Conclusion: Thus, a positive signal exists in the effect of radiation on these characteristics in drought tolerance. Research on the improvement of a drought-tolerant genotype under different drought conditions is necessary to enhance rice productivity and food security.
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Claims 7
Claim · model-written summary
Non-irradiated rice seeds had the highest mean shoot and seedling fresh weight.
- Taxon
- rice
Oryza sativat0 - Material
- MR269t0
- Treatment
- non-irradiated seedse0
- Outcome
- mean shoot and seedling fresh weighte0
- Direction
- higheste0
- Comparator
- irradiated seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The non-irradiated seeds presented the highest mean shoot and seedling fresh weight, whereas the irradiated seeds presented the largest root length and highest proline concentrations.”
t0“MR269 Genotype Rice”
Claim · model-written summary
Irradiated rice seeds had the largest root length.
- Taxon
- RiceOryza sativat0
- Material
- MR269t0
- Treatment
- irradiated seedse0
- Outcome
- root lengthe0
- Direction
- largeste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the irradiated seeds presented the largest root length and highest proline concentrations”
t0“MR269 Genotype Rice”
Claim · model-written summary
Irradiated rice seeds had the highest proline concentrations.
- Taxon
- RiceOryza sativat0
- Material
- MR269t0
- Treatment
- irradiated seedse0
- Outcome
- proline concentrationse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the irradiated seeds presented the largest root length and highest proline concentrations”
t0“MR269 Genotype Rice”
Claim · model-written summary
Increasing PEG concentration decreased all measured traits except proline content.
- Taxon
- RiceOryza sativat0
- Material
- MR269t0
- Treatment
- PEGe0
- Outcome
- means of all the characteristics investigatede0
- Direction
- decreasee0
- Qualifier
- except for the means of proline contente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PEG produced a decrease in the means of all the characteristics investigated by enhancing PEG concentration, except for the means of proline content”
t0“MR269 Genotype Rice”
Claim · model-written summary
Proline content increased with PEG concentration.
- Taxon
- RiceOryza sativat0
- Material
- MR269t0
- Treatment
- PEG concentratione0
- Outcome
- proline contente0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the means of proline content, which increased with the increase in PEG concentration”
t0“MR269 Genotype Rice”
Claim · model-written summary
At 20% PEG, irradiated genotypes had higher root length, dry weight and chlorophyll than non-irradiated ones.
- Taxon
- RiceOryza sativat0
- Material
- MR269t0
- Treatment
- irradiated genotypese0
- Outcome
- root length, dry weight, chlorophylle0
- Direction
- higheste0
- Qualifier
- 20% PEGe0
- Comparator
- non-irradiated onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irradiated genotypes produced the highest values of root length, dry weight, chlorophyll, proline and carbohydrates in concentrations of 20% PEG compared with the non-irradiated ones.”
t0“MR269 Genotype Rice”
Claim · model-written summary
At 20% PEG, irradiated genotypes had higher proline and carbohydrates than non-irradiated ones.
- Taxon
- RiceOryza sativat0
- Material
- MR269t0
- Treatment
- irradiated genotypese0
- Outcome
- proline and carbohydratese0
- Direction
- higheste0
- Qualifier
- 20% PEGe0
- Comparator
- non-irradiated onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irradiated genotypes produced the highest values of root length, dry weight, chlorophyll, proline and carbohydrates in concentrations of 20% PEG compared with the non-irradiated ones.”
t0“MR269 Genotype Rice”
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