Abstract
Survival of rice (Oryza sativa) upon an extreme rise of the water level depends on rapid stem elongation, which is mediated by ethylene. A genomic clone (OS-ACS5) encoding 1-aminocyclopropane-1-carboxylic acid (ACC) synthase, which catalyzes a regulatory step in ethylene biosynthesis, has been isolated from cv IR36, a lowland rice variety. Expression was induced upon short- and long-term submergence in cv IR36 and in cv Plai Ngam, a Thai deepwater rice variety. Under hypoxic conditions, abscisic acid and gibberellin had a reciprocal opposite effect on the activity of OS-ACS5. Gibberellin up-regulated and abscisic acid down-regulated OS-ACS5 mRNA accumulation. Growth experiments indicated that lowland rice responded to submergence with a burst of growth early on, but lacked the ability to sustain elongation growth. Sustained growth, characteristic for deepwater rice, was correlated with a prolonged induction of OS-ACS5. In addition, a more pronounced capacity to convert ACC to ethylene, a limited ACC conjugation, and a high level of endogenous gibberellin(20) were characteristic for the deepwater variety. An elevated level of OS-ACS5 messenger was found in cv IR36 plants treated with exogenous ACC. This observation was concomitant with an increase in the capacity of converting ACC to ethylene and in elongation growth, and resulted in prolonged survival. In conclusion, OS-ACS5 is involved in the rapid elongation growth of deepwater rice by contributing to the initial and long-term increase in ethylene levels. Our data also suggest that ACC limits survival of submerged lowland rice seedlings.
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Claims 15
Claim · model-written summary
A genomic clone OS-ACS5 encoding ACC synthase was isolated from lowland rice cv IR36.
Verbatim
e1“A genomic clone (OS-ACS5) encoding 1-aminocyclopropane-1-carboxylic acid (ACC) synthase”
e2“has been isolated from cv IR36, a lowland rice variety”
Claim · model-written summary
Expression of OS-ACS5 was induced by short- and long-term submergence in cv IR36.
- Taxon
- rice
Oryza sativae3 - Material
- cv IR36e3
- Treatment
- short- and long-term submergencee3
- Outcome
- Expressione3
- Direction
- inducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Expression was induced upon short- and long-term submergence in cv IR36 and in cv Plai Ngam, a Thai deepwater rice variety”
Claim · model-written summary
Expression of OS-ACS5 was induced by short- and long-term submergence in cv Plai Ngam, a deepwater rice.
- Taxon
- riceOryza sativae3
- Material
- cv Plai Ngame3
- Treatment
- short- and long-term submergencee3
- Outcome
- Expressione3
- Direction
- inducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Expression was induced upon short- and long-term submergence in cv IR36 and in cv Plai Ngam, a Thai deepwater rice variety”
Claim · model-written summary
Under hypoxia, gibberellin up-regulated OS-ACS5 mRNA accumulation.
- Taxon
- riceOryza sativae0
- Treatment
- Gibberelline5
- Gene
- OS-ACS5e5
- Outcome
- OS-ACS5 mRNA accumulatione5
- Direction
- up-regulatede5
- Qualifier
- Under hypoxic conditionse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Survival of rice (Oryza sativa)”
e4“Under hypoxic conditions, abscisic acid and gibberellin had a reciprocal opposite effect on the activity of OS-ACS5”
e5“Gibberellin up-regulated and abscisic acid down-regulated OS-ACS5 mRNA accumulation”
Claim · model-written summary
Under hypoxia, abscisic acid down-regulated OS-ACS5 mRNA accumulation.
- Taxon
- riceOryza sativae0
- Treatment
- abscisic acide5
- Gene
- OS-ACS5e5
- Outcome
- OS-ACS5 mRNA accumulatione5
- Direction
- down-regulatede5
- Qualifier
- Under hypoxic conditionse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Survival of rice (Oryza sativa)”
e4“Under hypoxic conditions, abscisic acid and gibberellin had a reciprocal opposite effect on the activity of OS-ACS5”
e5“Gibberellin up-regulated and abscisic acid down-regulated OS-ACS5 mRNA accumulation”
Claim · model-written summary
Lowland rice showed an early burst of growth under submergence but could not sustain elongation growth.
- Taxon
- lowland ricee6
- Treatment
- submergencee6
- Outcome
- burst of growthe6
- Direction
- increaseinferrede6
- Qualifier
- lacked the ability to sustain elongation growthe6
Not reportedComparator
Verbatim
e6“Growth experiments indicated that lowland rice responded to submergence with a burst of growth early on, but lacked the ability to sustain elongation growth”
Claim · model-written summary
Sustained growth in deepwater rice was correlated with prolonged induction of OS-ACS5.
Not reportedDirection
Verbatim
e7“Sustained growth, characteristic for deepwater rice, was correlated with a prolonged induction of OS-ACS5”
Claim · model-written summary
Deepwater rice had a more pronounced capacity to convert ACC to ethylene.
Verbatim
e1“a more pronounced capacity to convert ACC to ethylene, a limited ACC conjugation, and a high level of endogenous gibberellin(20) were characteristic for the deepwater variety”
Claim · model-written summary
Deepwater rice had limited ACC conjugation.
Verbatim
e1“a more pronounced capacity to convert ACC to ethylene, a limited ACC conjugation, and a high level of endogenous gibberellin(20) were characteristic for the deepwater variety”
Claim · model-written summary
Deepwater rice had a high level of endogenous gibberellin(20).
Verbatim
e1“a more pronounced capacity to convert ACC to ethylene, a limited ACC conjugation, and a high level of endogenous gibberellin(20) were characteristic for the deepwater variety”
Claim · model-written summary
Exogenous ACC elevated OS-ACS5 messenger levels in cv IR36.
- Taxon
- riceOryza sativae0
- Material
- cv IR36e1
- Treatment
- exogenous ACCe1
- Gene
- OS-ACS5e1
- Outcome
- OS-ACS5 messengere1
- Direction
- elevatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Survival of rice (Oryza sativa)”
e1“An elevated level of OS-ACS5 messenger was found in cv IR36 plants treated with exogenous ACC”
Claim · model-written summary
Exogenous ACC increased ACC-to-ethylene conversion capacity and elongation growth in cv IR36.
- Taxon
- riceOryza sativae0
- Treatment
- exogenous ACCe1
- Outcome
- capacity of converting ACC to ethylene and in elongation growthe2
- Direction
- increasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Survival of rice (Oryza sativa)”
e1“An elevated level of OS-ACS5 messenger was found in cv IR36 plants treated with exogenous ACC”
e2“This observation was concomitant with an increase in the capacity of converting ACC to ethylene and in elongation growth, and resulted in prolonged survival”
Claim · model-written summary
Exogenous ACC resulted in prolonged survival of rice.
- Taxon
- riceOryza sativae0
- Treatment
- exogenous ACCe1
- Outcome
- survivale2
- Direction
- prolongede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Survival of rice (Oryza sativa)”
e1“An elevated level of OS-ACS5 messenger was found in cv IR36 plants treated with exogenous ACC”
e2“This observation was concomitant with an increase in the capacity of converting ACC to ethylene and in elongation growth, and resulted in prolonged survival”
Claim · model-written summary
ACC may limit survival of submerged lowland rice seedlings.
Verbatim
e1“Our data also suggest that ACC limits survival of submerged lowland rice seedlings”
Claim · model-written summary
OS-ACS5 is involved in rapid elongation growth of deepwater rice by contributing to increased ethylene levels.
Verbatim
e1“In conclusion, OS-ACS5 is involved in the rapid elongation growth of deepwater rice by contributing to the initial and long-term increase in ethylene levels”
The same questions in other papers
1-aminocyclopropanecarboxylic acid · survival · Oryza sativa (rice)Positive and negative results
1 in the opposite direction
- negative
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.