Abstract
Genotypic variation in the root system is a potential source for improving drought tolerance of rainfed lowland rice (Oryza sativa L.). Our work aimed at characterizing both constitutive root traits (those present under well -watered conditions) and adaptive root traits (those developed in response to drought and rewatering) among eight diverse rice genotypes in three sets of greenhouse experiments (experiments 1, 2, and 3). Under well–watered conditions, genotypic variation was observed in root to shoot ratio, root growth rate, specific root length, deep root ratio, root mass per tiller, and root thickness. CT9993 and IR58821 had a high root to shoot ratio, deep and thick root system, and high root mass per tiller. However, CT9993 had a slow root growth rate and short specific root length. In response to drought in experiments 2 and 3, the total amount of assimilate distributed to roots was reduced and roots became thinner, but the proportion of total assimilate supply assigned to deeper layers increased, thereby maintaining deep root mass and increasing specific root length. On rewatering, root to shoot ratio increased, surface roots increased, and roots became thicker. During drought, NSG19, KDML105, Mahsuri, and IR58821 partitioned a larger proportion of assimilate to deep roots and had more deep root branching.
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Claims 12
Claim · model-written summary
Root to shoot ratio, root growth rate, specific root length, deep root ratio, root mass per tiller, and root thickness varied among genotypes when watered.
- Taxon
- Rice
Oryza sativat0 - Outcome
- genotypic variatione0
- Qualifier
- Under well–watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under well–watered conditions, genotypic variation was observed in root to shoot ratio, root growth rate, specific root length, deep root ratio, root mass per tiller, and root thickness.”
t0“Rice”
Claim · model-written summary
CT9993 had a high root to shoot ratio, deep and thick roots, and high root mass per tiller.
- Taxon
- RiceOryza sativat0
- Material
- CT9993e0
- Outcome
- high root to shoot ratio, deep and thick root system, and high root mass per tillere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT9993 and IR58821 had a high root to shoot ratio, deep and thick root system, and high root mass per tiller.”
t0“Rice”
Claim · model-written summary
IR58821 had a high root to shoot ratio, deep and thick roots, and high root mass per tiller.
- Taxon
- RiceOryza sativat0
- Material
- IR58821e0
- Outcome
- high root to shoot ratio, deep and thick root system, and high root mass per tillere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT9993 and IR58821 had a high root to shoot ratio, deep and thick root system, and high root mass per tiller.”
t0“Rice”
Claim · model-written summary
CT9993 had slow root growth and short specific root length.
- Taxon
- RiceOryza sativat0
- Material
- CT9993e0
- Outcome
- slow root growth rate and short specific root lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT9993 had a slow root growth rate and short specific root length.”
t0“Rice”
Claim · model-written summary
Drought reduced assimilate distributed to roots.
- Taxon
- RiceOryza sativat0
- Treatment
- droughte0
- Outcome
- total amount of assimilate distributed to rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In response to drought in experiments 2 and 3, the total amount of assimilate distributed to roots was reduced”
t0“Rice”
Claim · model-written summary
Drought made roots thinner.
- Taxon
- RiceOryza sativat0
- Treatment
- droughte0
- Outcome
- rootse0
- Direction
- thinnere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In response to drought in experiments 2 and 3, the total amount of assimilate distributed to roots was reduced and roots became thinner”
t0“Rice”
Claim · model-written summary
Drought increased the assimilate proportion assigned to deeper layers.
- Taxon
- RiceOryza sativat0
- Treatment
- droughte1
- Outcome
- proportion of total assimilate supply assigned to deeper layerse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the proportion of total assimilate supply assigned to deeper layers increased”
t0“Rice”
e1“In response to drought in experiments 2 and 3”
Claim · model-written summary
Deep root mass was maintained under drought.
- Taxon
- RiceOryza sativat0
- Treatment
- droughte1
- Outcome
- deep root masse0
- Direction
- maintaininge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thereby maintaining deep root mass and increasing specific root length”
t0“Rice”
e1“In response to drought in experiments 2 and 3”
Claim · model-written summary
Specific root length increased under drought.
- Taxon
- RiceOryza sativat0
- Treatment
- droughte1
- Outcome
- specific root lengthe0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thereby maintaining deep root mass and increasing specific root length”
t0“Rice”
e1“In response to drought in experiments 2 and 3”
Claim · model-written summary
Rewatering increased root to shoot ratio and surface roots.
- Taxon
- RiceOryza sativat0
- Treatment
- rewateringe0
- Outcome
- root to shoot ratio increased, surface rootse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On rewatering, root to shoot ratio increased, surface roots increased, and roots became thicker.”
t0“Rice”
Claim · model-written summary
Rewatering made roots thicker.
- Taxon
- RiceOryza sativat0
- Treatment
- rewateringe0
- Outcome
- rootse0
- Direction
- thickere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On rewatering, root to shoot ratio increased, surface roots increased, and roots became thicker.”
t0“Rice”
Claim · model-written summary
During drought NSG19, KDML105, Mahsuri, and IR58821 had greater deep-root assimilate partitioning and branching.
- Taxon
- RiceOryza sativat0
- Outcome
- larger proportion of assimilate to deep roots and had more deep root branchinge0
- Qualifier
- During droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During drought, NSG19, KDML105, Mahsuri, and IR58821 partitioned a larger proportion of assimilate to deep roots and had more deep root branching.”
t0“Rice”
The same questions in other papers
drought · growth · Oryza sativa (rice)Positive and negative results
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- negative
- negative
- no effect
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See all 282 papers →rewatering · growth · Oryza sativa (rice)Results agree
7 papers in the same direction as this paper
- positive
- positive
- positive
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See all 8 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.