Abstract
In rainfed agroecosystems, water scarcity reduces the yield of rice by impairing the functionality of roots and reducing water uptake. The study evaluated morphological and anatomical properties of roots of 28 rice varieties that were planted under both irrigated and rainfed conditions in a rainout shelter during the 2020–21 kharif season. Root characteristics 45 days following sowing were measured using mini-rhizotrons and WinRhizo imaging; identified genotypes were subsequently analysed by scanning electron microscopy (SEM) to measure cortical architecture and aerenchyma development. There was a great variation in the genotypes in cumulative root length, surface area, mean diameter and volume. Under rainfed conditions, DT-122 retained longer root length, surface area and volume with preserved cortical cells and aerenchyma structure. Contrary to this, DT-127 was also found to reduce root length and volume, impair cortical cells and generate less aerenchyma. These different reactions suggest two different adaptive patterns: DT-122 use a mixture of anatomical stability and wide soil exploration whereas DT-127 seems to be more adaptable to irrigated areas. Even though aerenchyma promotes aeration and mechanical support of flooded soils, it can impair root functionality during droughts, which is a trade-off in drought tolerance. Combination of morphological and anatomical studies produced a more detailed evaluation of the performance of genotypes in water stress. DT-122 is a potential candidate to upland rice breeding, but multilocation trials to determine the correlation between root characteristics and water extraction depth and grain yield are required to determine its usefulness.
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Claims 11
Claim · model-written summary
The 28 rice genotypes varied greatly in cumulative root length, surface area and mean diameter.
- Taxon
- rice
Oryza sativae0 - Outcome
- cumulative root length, surface area, mean diametere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e1“There was a great variation in the genotypes in cumulative root length, surface area, mean diameter and volume”
Claim · model-written summary
The 28 rice genotypes varied greatly in root volume.
- Taxon
- riceOryza sativae0
- Outcome
- volumee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e1“There was a great variation in the genotypes in cumulative root length, surface area, mean diameter and volume”
Claim · model-written summary
Under rainfed conditions, rice genotype DT-122 retained longer root length, surface area and volume.
- Taxon
- riceOryza sativae0
- Material
- DT-122e1
- Treatment
- rainfed conditionse1
- Outcome
- root length, surface area and volumee1
- Direction
- longere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e1“Under rainfed conditions, DT-122 retained longer root length, surface area and volume”
Claim · model-written summary
Under rainfed conditions, DT-122 retained preserved cortical cells and aerenchyma structure.
- Taxon
- riceOryza sativae0
- Material
- DT-122e1
- Treatment
- rainfed conditionse1
- Outcome
- cortical cells and aerenchyma structuree1
- Direction
- preservede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e1“Under rainfed conditions, DT-122 retained longer root length, surface area and volume with preserved cortical cells and aerenchyma structure”
Claim · model-written summary
Genotype DT-127 reduced root length and volume under rainfed conditions.
- Taxon
- riceOryza sativae0
- Material
- DT-127e1
- Treatment
- rainfed conditionse2
- Outcome
- root length and volumee1
- Direction
- reducee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e2“Under rainfed conditions”
e1“DT-127 was also found to reduce root length and volume”
Claim · model-written summary
Genotype DT-127 had impaired cortical cells under rainfed conditions.
- Taxon
- riceOryza sativae0
- Material
- DT-127e1
- Treatment
- rainfed conditionse2
- Outcome
- cortical cellse1
- Direction
- impaire1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e2“Under rainfed conditions”
e1“DT-127 was also found to reduce root length and volume, impair cortical cells and generate less aerenchyma”
Claim · model-written summary
Genotype DT-127 generated less aerenchyma under rainfed conditions.
- Taxon
- riceOryza sativae0
- Material
- DT-127e1
- Treatment
- rainfed conditionse2
- Outcome
- aerenchymae1
- Direction
- lesse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e2“Under rainfed conditions”
e1“DT-127 was also found to reduce root length and volume, impair cortical cells and generate less aerenchyma”
Claim · model-written summary
The authors suggest DT-122 uses a mixture of anatomical stability and wide soil exploration as its adaptive pattern.
- Taxon
- riceOryza sativae0
- Material
- DT-122e1
- Outcome
- adaptive patternse1
- Qualifier
- mixture of anatomical stability and wide soil exploratione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e1“These different reactions suggest two different adaptive patterns: DT-122 use a mixture of anatomical stability and wide soil exploration”
Claim · model-written summary
DT-127 seems to be more adaptable to irrigated areas.
- Taxon
- riceOryza sativae0
- Material
- DT-127e1
- Outcome
- more adaptable to irrigated arease1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e1“DT-127 seems to be more adaptable to irrigated areas”
Claim · model-written summary
Aerenchyma, although it promotes aeration and support in flooded soils, can impair root functionality during droughts, a trade-off in drought tolerance.
- Taxon
- riceOryza sativae0
- Organ / stage
- aerenchymae1
- Outcome
- root functionalitye1
- Qualifier
- trade-off in drought tolerancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 rice varieties”
e1“aerenchyma promotes aeration and mechanical support of flooded soils, it can impair root functionality during droughts, which is a trade-off in drought tolerance”
Claim · model-written summary
DT-122 is recommended as a potential candidate for upland rice breeding.
- Taxon
- riceOryza sativae1
- Material
- DT-122e1
- Outcome
- potential candidate to upland rice breedinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“DT-122 is a potential candidate to upland rice breeding”
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See all 26 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.