Abstract
Drought stress is a major abiotic constraint to rice productivity. Seedling-stage screening of rice genotypes is therefore essential for identifying key adaptive traits and drought-tolerant genotypes. This study evaluated 40 lowland rainfed rice genotypes for seedling-stage drought tolerance under greenhouse conditions using a split-plot randomized complete block design. Progressive drought stress was imposed for 21 days, and root and shoot traits were assessed. Substantial morphological variability was observed among genotypes for most traits. Drought stress significantly reduced root dry weight (52.8%), shoot dry weight (51.6%), seedling biomass (51.5%), number of roots (39.3%), number of roots with at least 5 cm length (37%), and shoot length (21.1%). Root-to-shoot ratio showed significant water × genotype interaction. Correlation analysis, heritability, and genetic advance identified root traits as reliable selection criteria for seedling-stage drought stress screening. Combined Drought Stress Response Index (CDSRI) classified 17.5% of genotypes as tolerant and 12.5% as sensitive. Tolerant genotypes (B1P15, Chupa, Mucabo, Mpulo, Nasoco, Nene, and Mutanzania) represent a valuable resource for rice breeding targeting early-season drought resilience. These findings support breeders in identification of adaptive traits and provide a basis for policy interventions to invest in drought-resilient varieties that benefit farmers in rainfed areas.
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Claims 11
Claim · model-written summary
Drought stress significantly reduced root dry weight in rice seedlings by 52.8%.
- Taxon
- Oryza sativa
Oryza sativat0 - Treatment
- Drought stresse1
- Outcome
- root dry weighte1
- Direction
- reducede1
- Value
- 52.8%e1
- Setting
- greenhouse conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Drought stress significantly reduced root dry weight (52.8%), shoot dry weight (51.6%), seedling biomass (51.5%), number of roots (39.3%), number of roots with at least 5 cm length (37%), and shoot length (21.1%)”
e2“under greenhouse conditions”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
Drought stress significantly reduced shoot dry weight in rice seedlings by 51.6%.
- Taxon
- Oryza sativaOryza sativat0
- Treatment
- Drought stresse1
- Outcome
- shoot dry weighte1
- Direction
- reducede1
- Value
- 51.6%e1
- Setting
- greenhouse conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Drought stress significantly reduced root dry weight (52.8%), shoot dry weight (51.6%), seedling biomass (51.5%), number of roots (39.3%), number of roots with at least 5 cm length (37%), and shoot length (21.1%)”
e2“under greenhouse conditions”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
Drought stress significantly reduced seedling biomass in rice by 51.5%.
- Taxon
- Oryza sativaOryza sativat0
- Treatment
- Drought stresse1
- Outcome
- seedling biomasse1
- Direction
- reducede1
- Value
- 51.5%e1
- Setting
- greenhouse conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Drought stress significantly reduced root dry weight (52.8%), shoot dry weight (51.6%), seedling biomass (51.5%), number of roots (39.3%), number of roots with at least 5 cm length (37%), and shoot length (21.1%)”
e2“under greenhouse conditions”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
Drought stress significantly reduced the number of roots in rice by 39.3%.
- Taxon
- Oryza sativaOryza sativat0
- Treatment
- Drought stresse1
- Outcome
- number of rootse1
- Direction
- reducede1
- Value
- 39.3%e1
- Setting
- greenhouse conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Drought stress significantly reduced root dry weight (52.8%), shoot dry weight (51.6%), seedling biomass (51.5%), number of roots (39.3%), number of roots with at least 5 cm length (37%), and shoot length (21.1%)”
e2“under greenhouse conditions”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
Drought stress significantly reduced the number of roots with at least 5 cm length in rice by 37%.
- Taxon
- Oryza sativaOryza sativat0
- Treatment
- Drought stresse1
- Outcome
- number of roots with at least 5 cm lengthe1
- Direction
- reducede1
- Value
- 37%e1
- Setting
- greenhouse conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Drought stress significantly reduced root dry weight (52.8%), shoot dry weight (51.6%), seedling biomass (51.5%), number of roots (39.3%), number of roots with at least 5 cm length (37%), and shoot length (21.1%)”
e2“under greenhouse conditions”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
Drought stress significantly reduced shoot length in rice by 21.1%.
- Taxon
- Oryza sativaOryza sativat0
- Treatment
- Drought stresse1
- Outcome
- shoot lengthe1
- Direction
- reducede1
- Value
- 21.1%e1
- Setting
- greenhouse conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Drought stress significantly reduced root dry weight (52.8%), shoot dry weight (51.6%), seedling biomass (51.5%), number of roots (39.3%), number of roots with at least 5 cm length (37%), and shoot length (21.1%)”
e2“under greenhouse conditions”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
The root-to-shoot ratio of rice showed a significant water-by-genotype interaction.
- Taxon
- Oryza sativaOryza sativat0
- Treatment
- watere3
- Outcome
- Root-to-shoot ratioe3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Root-to-shoot ratio showed significant water × genotype interaction”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
Root traits were identified as reliable selection criteria for seedling-stage drought stress screening in rice.
- Taxon
- Oryza sativaOryza sativat0
- Outcome
- reliable selection criteriae4
- Qualifier
- root traitse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Correlation analysis, heritability, and genetic advance identified root traits as reliable selection criteria for seedling-stage drought stress screening”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
The Combined Drought Stress Response Index classified 17.5% of rice genotypes as tolerant.
- Taxon
- Oryza sativaOryza sativat0
- Material
- genotypese5
- Outcome
- tolerante5
- Value
- 17.5%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Combined Drought Stress Response Index (CDSRI) classified 17.5% of genotypes as tolerant and 12.5% as sensitive”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
The Combined Drought Stress Response Index classified 12.5% of rice genotypes as sensitive.
- Taxon
- Oryza sativaOryza sativat0
- Material
- genotypese5
- Outcome
- sensitivee5
- Value
- 12.5%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Combined Drought Stress Response Index (CDSRI) classified 17.5% of genotypes as tolerant and 12.5% as sensitive”
t0“Screening Rice (Oryza sativa L.) Genotypes”
Claim · model-written summary
Substantial morphological variability was observed among rice genotypes for most traits.
- Taxon
- Oryza sativaOryza sativat0
- Material
- genotypese7
- Outcome
- morphological variabilitye7
- Qualifier
- for most traitse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Substantial morphological variability was observed among genotypes for most traits”
t0“Screening Rice (Oryza sativa L.) Genotypes”
The same questions in other papers
drought · growth · Oryza sativa (rice)Positive and negative results
183 papers in the same direction as this paper · 98 in the opposite direction
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