Abstract
BACKGROUND: Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L). Little is known on trade-offs with drought tolerance. This study explored the relevance of (sugar) metabolic and morphogenetic traits to describe the genetic diversity of rice early vigour and its phenotypic plasticity under drought conditions. A greenhouse experiment was conducted to characterize on a panel of 43 rice genotypes plant morphogenesis and sugar concentration in expanded (source) and expanding (sink) leaves. RESULTS: Across genotypes in control treatment, leaf starch concentration was negatively correlated with organogenetic development rate (DR, defined as leaf appearance rate on main stem). Genotypes with small leaves had high DR and tiller number but low leaf starch concentration. Under drought, vigorous genotypes showed stronger growth reduction. Starch concentration decreased in source leaves, by contrast with soluble sugars and with that observed in sink leaves. Accordingly, genotypes were grouped in three clusters differing in constitutive vigour, starch storage and growth maintenance under drought showing a trade off between constitutive vigour and drought tolerance. CONCLUSIONS: It was therefore suggested that non structural carbohydrates, particularly starch, were relevant markers of early vigour. Their relevance as markers of growth maintenance under drought needs to be further explored. Results are discussed regarding novel process based traits to be introduced in the GRiSP (Global Rice Science Partnership) phenotyping network.
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Claims 8
Claim · model-written summary
Across genotypes in the control treatment, leaf starch concentration was negatively correlated with organogenetic development rate in rice.
- Taxon
- rice
Oryza sativae0 - Treatment
- control treatmente1
- Compound
- starche1
- Outcome
- organogenetic development ratee1
- Direction
- negatively correlatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L)”
e1“Across genotypes in control treatment, leaf starch concentration was negatively correlated with organogenetic development rate”
Claim · model-written summary
In rice, genotypes with small leaves had high development rate (DR) and high tiller number.
- Taxon
- riceOryza sativae0
- Material
- Genotypes with small leavese2
- Outcome
- DR and tiller numbere2
- Direction
- highe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L)”
e2“Genotypes with small leaves had high DR and tiller number but low leaf starch concentration”
Claim · model-written summary
In rice, genotypes with small leaves had low leaf starch concentration.
- Taxon
- riceOryza sativae0
- Material
- Genotypes with small leavese2
- Outcome
- leaf starch concentratione2
- Direction
- lowe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L)”
e2“Genotypes with small leaves had high DR and tiller number but low leaf starch concentration”
Claim · model-written summary
Under drought, vigorous rice genotypes showed stronger growth reduction.
- Taxon
- riceOryza sativae0
- Material
- vigorous genotypese3
- Treatment
- Under droughte3
- Outcome
- growth reductione3
- Direction
- strongere3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L)”
e3“Under drought, vigorous genotypes showed stronger growth reduction”
Claim · model-written summary
Starch concentration decreased in source leaves of rice, in contrast to soluble sugars and to sink leaves.
- Taxon
- riceOryza sativae0
- Organ / stage
- source leavese4
- Outcome
- Starch concentratione4
- Direction
- decreasede4
- Qualifier
- by contrast with soluble sugars and with that observed in sink leavese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L)”
e4“Starch concentration decreased in source leaves, by contrast with soluble sugars and with that observed in sink leaves”
Claim · model-written summary
Rice genotypes were grouped into three clusters differing in constitutive vigour, starch storage and growth maintenance under drought.
- Taxon
- riceOryza sativae0
- Material
- genotypese5
- Outcome
- three clusterse5
- Qualifier
- differing in constitutive vigour, starch storage and growth maintenance under droughte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L)”
e5“genotypes were grouped in three clusters differing in constitutive vigour, starch storage and growth maintenance under drought”
Claim · model-written summary
In rice, constitutive vigour showed a trade-off with drought tolerance.
- Taxon
- riceOryza sativae0
- Treatment
- droughte6
- Outcome
- trade off between constitutive vigour and drought tolerancee6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L)”
e6“showing a trade off between constitutive vigour and drought tolerance”
Claim · model-written summary
Non-structural carbohydrates, particularly starch, were suggested to be relevant markers of early vigour in rice.
- Taxon
- riceOryza sativae0
- Compound
- non structural carbohydrates, particularly starche7
- Outcome
- relevant markers of early vigoure7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early vigour (biomass accumulation) is a useful but complex trait in rainfed rice (Oryza sativa L)”
e7“non structural carbohydrates, particularly starch, were relevant markers of early vigour”
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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