Abstract
The present study evaluated waterlogging tolerance, root porosity and radial O(2) loss (ROL) from the adventitious roots, of seven upland, three paddy, and two deep-water genotypes of rice (Oryza sativa L.). Upland types, with the exception of one genotype, were as tolerant of 30 d soil waterlogging as the paddy and deep-water types. In all but one of the 12 genotypes, the number of adventitious roots per stem increased for plants grown in waterlogged, compared with drained, soil. When grown in stagnant deoxygenated nutrient solution, genotypic variation was evident for root porosity and rates of ROL, but there was no overall difference between plants from the three cultural types. Adventitious root porosity increased from 20-26 % for plants grown in aerated solution to 29-41 % for plants grown in stagnant solution. Growth in stagnant solution also induced a 'tight' barrier to ROL in the basal regions of adventitious roots of five of the seven upland types, all three paddy types, and the two deep-water types. The enhanced porosity provided a low resistance pathway for O(2) movement to the root tip, and the barrier to ROL in basal zones would have further enhanced longitudinal O(2) diffusion towards the apex, by diminishing losses to the rhizosphere. The plasticity in root physiology, as described above, presumably contributes to the ability of rice to grow in diverse environments that differ markedly in soil waterlogging, such as drained upland soils as well as waterlogged paddy fields.
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Claims 10
Claim · model-written summary
Most upland rice genotypes tolerated 30 days of soil waterlogging as well as paddy and deep-water types.
- Taxon
- Rice
Oryza sativat0 - Material
- Upland typese0
- Outcome
- tolerant of 30 d soil waterlogginge0
- Direction
- as tolerante0
- Comparator
- paddy and deep-water typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Upland types, with the exception of one genotype, were as tolerant of 30 d soil waterlogging as the paddy and deep-water types”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Waterlogged soil increased adventitious roots per stem in 11 of 12 rice genotypes compared with drained soil.
- Taxon
- RiceOryza sativat0
- Treatment
- waterloggede0
- Outcome
- number of adventitious roots per steme0
- Direction
- increasede0
- Value
- 12 genotypese0
- Comparator
- drainede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all but one of the 12 genotypes, the number of adventitious roots per stem increased for plants grown in waterlogged, compared with drained, soil”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Root porosity varied by rice genotype under stagnant deoxygenated nutrient solution.
- Taxon
- RiceOryza sativat0
- Outcome
- root porositye0
- Direction
- variatione0
- Setting
- stagnant deoxygenated nutrient solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When grown in stagnant deoxygenated nutrient solution, genotypic variation was evident for root porosity and rates of ROL”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Radial oxygen loss rates varied by rice genotype under stagnant deoxygenated nutrient solution.
- Taxon
- RiceOryza sativat0
- Outcome
- rates of ROLe0
- Direction
- variatione0
- Setting
- stagnant deoxygenated nutrient solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When grown in stagnant deoxygenated nutrient solution, genotypic variation was evident for root porosity and rates of ROL”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Root porosity and radial oxygen loss showed no overall difference among the three rice cultural types.
- Taxon
- RiceOryza sativat0
- Outcome
- root porosity and rates of ROLe1
- Direction
- no overall differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no overall difference between plants from the three cultural types”
e1“root porosity and rates of ROL”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Stagnant solution increased rice adventitious root porosity to 29-41%, from 20-26% under aerated solution.
- Taxon
- RiceOryza sativat0
- Treatment
- stagnant solutione0
- Outcome
- Adventitious root porositye0
- Direction
- increasede0
- Value
- 29-41 %e0
- Qualifier
- 20-26 %e0
- Comparator
- aerated solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Adventitious root porosity increased from 20-26 % for plants grown in aerated solution to 29-41 % for plants grown in stagnant solution”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Stagnant solution induced a tight radial oxygen loss barrier in basal adventitious roots across most upland and all paddy and deep-water rice types.
- Taxon
- RiceOryza sativat0
- Organ / stage
- basal regions of adventitious rootse0
- Treatment
- stagnant solutione0
- Outcome
- 'tight' barrier to ROLe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth in stagnant solution also induced a 'tight' barrier to ROL in the basal regions of adventitious roots of five of the seven upland types, all three paddy types, and the two deep-water types”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Enhanced rice root porosity provides a low-resistance oxygen pathway to the root tip.
- Taxon
- RiceOryza sativat0
- Outcome
- O(2) movement to the root tipe0
- Qualifier
- enhanced porositye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhanced porosity provided a low resistance pathway for O(2) movement to the root tip”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
The basal barrier to radial oxygen loss is inferred to enhance oxygen diffusion toward the rice root apex by reducing rhizosphere losses.
- Taxon
- RiceOryza sativat0
- Outcome
- longitudinal O(2) diffusion towards the apexe0
- Direction
- enhancede0
- Qualifier
- diminishing losses to the rhizospheree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the barrier to ROL in basal zones would have further enhanced longitudinal O(2) diffusion towards the apex, by diminishing losses to the rhizosphere”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Plasticity in root physiology presumably supports rice growth across soils with different waterlogging conditions.
- Taxon
- riceOryza sativae0
- Outcome
- ability of rice to grow in diverse environmentse0
- Qualifier
- plasticity in root physiologye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plasticity in root physiology, as described above, presumably contributes to the ability of rice to grow in diverse environments that differ markedly in soil waterlogging”
The same questions in other papers
flooding · growth · Oryza sativa (rice)Positive and negative results
63 papers in the same direction as this paper · 72 in the opposite direction · 2 reporting no difference from an alternative
- negative
- negative
- negative
134 papers more in this group
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