Abstract
Upland rice grown by rice farmers is having the lowest productivity in the rice production system. Drought stress is the most severe abiotic constraint for upland rice. The improvement of rice productivity in such ecosystems is essential to meet the food security needs of the population. Therefore, the cultivation of drought tolerant rice is becoming an increasingly important task. Numerous minor traits have been proposed to assist plant breeders in their selection, but most of these traits are not used in breeding because they are not practical for breeding purposes, have low heritability, or are not very correlated with grain productivity. There has been shown, that standardization of drought screening improves heritability under stress to the values similar to those obtained for the yields under well-watered conditions. Nowadays there has now been proven that drought-resistant varieties can be developed by direct selection for productivity under stressful conditions. Currently, there have been identified many quantitative trait loci (QTL) of drought tolerance in rice, but only a few of them are suitable for use in marker breeding. However, the identified genes of great drought tolerance can be effectively used in breeding for drought tolerance. The use of molecular markers will improve the efficiency of breeding work. The current review has briefly considered the importance of rice, its various production systems, and the impact of drought stress on rice production. There have been discussed the physiological mechanisms contributing to the maintenance of grain productivity under drought conditions, and there have been analyzed the breeding methods for improvement of drought resistance.
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Claims 6
Claim · model-written summary
Many proposed minor traits are impractical or weak predictors of grain productivity.
- Taxon
- Upland rice
Oryza sativat0 - Outcome
- most of these traits are not used in breedinge0
- Qualifier
- low heritabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most of these traits are not used in breeding because they are not practical for breeding purposes, have low heritability, or are not very correlated with grain productivity”
t0“Upland rice”
Claim · model-written summary
Standardized drought screening improves heritability under stress to levels comparable with well-watered yield heritability.
- Taxon
- Upland riceOryza sativat0
- Treatment
- standardization of drought screeninge0
- Outcome
- heritability under stresse0
- Direction
- improvese0
- Comparator
- yields under well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“standardization of drought screening improves heritability under stress to the values similar to those obtained for the yields under well-watered conditions”
t0“Upland rice”
Claim · model-written summary
Direct selection for productivity under stress can develop drought-resistant rice varieties.
- Taxon
- riceOryza sativat0
- Treatment
- direct selection for productivity under stressful conditionse0
- Outcome
- drought-resistant varieties can be developede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-resistant varieties can be developed by direct selection for productivity under stressful conditions”
t0“rice”
Claim · model-written summary
Only a few identified rice drought tolerance QTL are suitable for marker breeding.
- Taxon
- riceOryza sativae0
- Gene
- quantitative trait loci (QTL) of drought tolerancee0
- Outcome
- only a few of them are suitable for use in marker breedinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“many quantitative trait loci (QTL) of drought tolerance in rice, but only a few of them are suitable for use in marker breeding”
Claim · model-written summary
Identified drought tolerance genes can be used in breeding.
- Taxon
- riceOryza sativat0
- Gene
- genes of great drought tolerancee0
- Outcome
- can be effectively used in breeding for drought tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“identified genes of great drought tolerance can be effectively used in breeding for drought tolerance”
t0“rice”
Claim · model-written summary
Molecular markers are expected to improve breeding efficiency.
- Taxon
- riceOryza sativat0
- Outcome
- efficiency of breeding worke0
- Direction
- improvee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of molecular markers will improve the efficiency of breeding work.”
t0“rice”