Abstract
Adverse effects of elongation growth on tolerance to complete submergence for up to 14 d were evaluated in rice seedlings of cultivars which differed in submergence tolerance. There is a good negative correlation between per cent survival and elongation growth of genotypes during complete submergence (r = − 0.81). When elongation growth underwater is minimized by application of a gibberellin biosynthesis inhibitor, per cent survival increases by as much as 50 times for one cultivar. These effects are likely related to elongation growth since (i) addition of gibberellin had the opposite effect by reducing survival, and (ii) when the elongation inhibitor and gibberellin were added together, there was no effect on elongation growth and the per cent survival did not change. A GA-deficient mutant of rice which had little elongation ability during submergence showed a high level of submergence tolerance when plants were submerged at equal initial dry weights and carbohydrate levels relative to a submergence-tolerant cultivar. These results are consistent with the hypothesis that elongation growth competes with maintenance processes for energy and hence reduces survival during submergence. The impact of these findings is that in environments where elongation ability is not required, there is a potential to increase submergence tolerance of agriculturally important cultivars by selecting for least elongation, at least during periods of complete submergence. Furthermore, this trade-off between stimulated elongation growth and submergence tolerance will have important ecological consequences for the distribution of plant species in different flood-prone environments.
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Claims 8
Claim · model-written summary
Rice genotype survival and elongation during complete submergence were negatively correlated (r = − 0.81).
- Taxon
- rice
Oryza sativat0 - Organ / stage
- genotypese0
- Outcome
- per cent survivale0
- Direction
- negativee0
- Value
- r = − 0.81e0
- Qualifier
- elongation growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There is a good negative correlation between per cent survival and elongation growth of genotypes during complete submergence (r = − 0.81).”
t0“rice”
Claim · model-written summary
A gibberellin biosynthesis inhibitor that minimized underwater elongation increased survival as much as 50 times in one rice cultivar.
- Taxon
- riceOryza sativat0
- Material
- one cultivare0
- Treatment
- application of a gibberellin biosynthesis inhibitore0
- Outcome
- per cent survivale0
- Direction
- increasese0
- Value
- 50 timese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When elongation growth underwater is minimized by application of a gibberellin biosynthesis inhibitor, per cent survival increases by as much as 50 times for one cultivar.”
t0“rice”
Claim · model-written summary
Added gibberellin reduced rice survival under submergence.
- Taxon
- riceOryza sativat0
- Treatment
- addition of gibberelline0
- Outcome
- survivale0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“addition of gibberellin had the opposite effect by reducing survival”
t0“rice”
Claim · model-written summary
Combining elongation inhibitor and gibberellin did not change rice elongation growth.
- Taxon
- riceOryza sativat0
- Treatment
- elongation inhibitor and gibberellin were added togethere0
- Outcome
- elongation growthe0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the elongation inhibitor and gibberellin were added together, there was no effect on elongation growth and the per cent survival did not change.”
t0“rice”
Claim · model-written summary
Combining elongation inhibitor and gibberellin did not change rice survival.
- Taxon
- riceOryza sativat0
- Treatment
- elongation inhibitor and gibberellin were added togethere0
- Outcome
- per cent survivale0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the elongation inhibitor and gibberellin were added together, there was no effect on elongation growth and the per cent survival did not change.”
t0“rice”
Claim · model-written summary
A GA-deficient rice mutant with little elongation showed high submergence tolerance at matched initial dry weight and carbohydrates.
- Taxon
- riceOryza sativae0
- Material
- GA-deficient mutante0
- Outcome
- submergence tolerancee0
- Direction
- highe0
- Qualifier
- equal initial dry weights and carbohydrate levelse0
- Comparator
- submergence-tolerant cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A GA-deficient mutant of rice which had little elongation ability during submergence showed a high level of submergence tolerance when plants were submerged at equal initial dry weights and carbohydrate levels relative to a submergence-tolerant cultivar.”
Claim · model-written summary
The authors infer that elongation growth competes with maintenance for energy and reduces rice survival under submergence.
- Taxon
- riceOryza sativat0
- Outcome
- survivale0
- Direction
- reducese0
- Qualifier
- elongation growth competes with maintenance processes for energye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results are consistent with the hypothesis that elongation growth competes with maintenance processes for energy and hence reduces survival during submergence.”
t0“rice”
Claim · model-written summary
The authors suggest selecting for minimal elongation to raise submergence tolerance where elongation is unnecessary.
- Taxon
- riceOryza sativat0
- Outcome
- selecting for least elongatione0
- Direction
- increasee0
- Qualifier
- during periods of complete submergencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is a potential to increase submergence tolerance of agriculturally important cultivars by selecting for least elongation, at least during periods of complete submergence.”
t0“rice”
The same questions in other papers
class · survival · Oryza sativa (rice)Positive and negative results
2 in the opposite direction
- positive
- positive
class · growth · Oryza sativa (rice)Positive and negative results
17 papers in the same direction as this paper · 62 in the opposite direction
- positive
- positive
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76 papers more in this group
See all 80 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.