Abstract
Expansins are a family of proteins that catalyze long-term extension of isolated cell walls. Previously, two expansin proteins have been isolated from internodes of deepwater rice, and three rice expansin genes, Os-EXP1, Os-EXP2, and Os-EXP3, have been identified. We report here on the identification of a fourth rice expansin gene, Os-EXP4, and on the expression pattern of the rice expansin gene family in deepwater rice. Rice expansin genes show organ-specific differential expression in the coleoptile, root, leaf, and internode. In these organs, there is increased expression of Os-EXP1, Os-EXP3, and Os-EXP4 in developmental regions where elongation occurs. This pattern of gene expression is also correlated with acid-induced in vitro cell wall extensibility. Submergence and treatment with gibberellin, both of which promote rapid internodal elongation, induced accumulation of Os-EXP4 mRNA before the rate of growth started to increase. Our results indicate that the expression of expansin genes in deepwater rice is differentially regulated by developmental, hormonal, and environmental signals and is correlated with cell elongation.
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Claims 8
Claim · model-written summary
A fourth rice expansin gene, Os-EXP4, was identified.
- Taxon
- rice
Oryza sativae0 - Gene
- Os-EXP4e0
- Outcome
- fourth rice expansin genee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“identification of a fourth rice expansin gene, Os-EXP4”
Claim · model-written summary
Rice expansin genes had organ-specific differential expression.
- Taxon
- RiceOryza sativae0
- Organ / stage
- coleoptile, root, leaf, and internodee0
- Gene
- Rice expansin genese0
- Outcome
- organ-specific differential expressione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice expansin genes show organ-specific differential expression in the coleoptile, root, leaf, and internode.”
Claim · model-written summary
Os-EXP1 expression increased in elongating developmental regions.
- Taxon
- riceOryza sativat0
- Organ / stage
- developmental regions where elongation occurse0
- Gene
- Os-EXP1e0
- Outcome
- expressione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is increased expression of Os-EXP1, Os-EXP3, and Os-EXP4 in developmental regions where elongation occurs.”
t0“rice”
Claim · model-written summary
Os-EXP3 expression increased in elongating developmental regions.
- Taxon
- riceOryza sativat0
- Gene
- Os-EXP3e0
- Outcome
- expressione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is increased expression of Os-EXP1, Os-EXP3, and Os-EXP4 in developmental regions where elongation occurs.”
t0“rice”
Claim · model-written summary
Os-EXP4 expression increased in elongating developmental regions.
- Taxon
- riceOryza sativat0
- Gene
- Os-EXP4e0
- Outcome
- expressione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is increased expression of Os-EXP1, Os-EXP3, and Os-EXP4 in developmental regions where elongation occurs.”
t0“rice”
Claim · model-written summary
Expansin expression correlated with acid-induced cell wall extensibility.
- Taxon
- riceOryza sativat0
- Gene
- gene expressione0
- Outcome
- acid-induced in vitro cell wall extensibilitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This pattern of gene expression is also correlated with acid-induced in vitro cell wall extensibility.”
t0“rice”
Claim · model-written summary
Submergence induced Os-EXP4 mRNA accumulation before growth accelerated.
- Taxon
- riceOryza sativat0
- Treatment
- Submergencee0
- Gene
- Os-EXP4e0
- Outcome
- accumulation of Os-EXP4 mRNAe0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Submergence and treatment with gibberellin, both of which promote rapid internodal elongation, induced accumulation of Os-EXP4 mRNA before the rate of growth started to increase.”
t0“rice”
Claim · model-written summary
Gibberellin induced Os-EXP4 mRNA accumulation before growth accelerated.
- Taxon
- riceOryza sativat0
- Treatment
- treatment with gibberelline0
- Gene
- Os-EXP4e0
- Outcome
- accumulation of Os-EXP4 mRNAe0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment with gibberellin, both of which promote rapid internodal elongation, induced accumulation of Os-EXP4 mRNA before the rate of growth started to increase.”
t0“rice”
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