Abstract
Rice (Oryza sativa) indica and japonica inter-subspecific hybrids hold significant potential for increasing yields. However, differences in diurnal flower-opening time (DFOT) between the 2 subspecies limit the effective exploitation of this heterosis. Additionally, the timing of post-anthesis glume closure (PAGC) affects both hybrid seed yield and quality. Despite their importance, the molecular mechanisms underlying these processes, particularly glume closure, remain poorly understood. In this study, we identify OsAIM1 as a pivotal regulator of both DFOT and PAGC in rice. The aim1-2 mutant exhibits delayed DFOT and impaired PAGC while maintaining normal floret structure, emphasizing its crucial role in floret dynamics. OsAIM1 is highly expressed in lodicules and encodes a peroxisome-localized multifunctional protein. Functional analyses reveal that OsAIM1 regulates lodicule swelling during floret opening and withering post-anthesis, processes essential for glume movement. We further demonstrate that OsAIM1-dependent jasmonic acid biosynthesis is indispensable for coordinating floret opening and closure and influences sugar transport to ensure proper lodicule dynamics. Importantly, natural variation in the OsAIM1 coding region contributes to DFOT divergence between japonica and indica subspecies, providing a molecular basis for their asynchronous flowering. These findings establish OsAIM1 as a key regulator of floret dynamics and a promising molecular target for synchronizing flowering in hybrid rice production.
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Claims 11
Claim · model-written summary
The aim1-2 rice mutant showed delayed diurnal flower-opening time.
- Taxon
- rice
Oryza sativat0 - Material
- aim1-2 mutante0
- Outcome
- DFOTe0
- Direction
- delayede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The aim1-2 mutant exhibits delayed DFOT and impaired PAGC while maintaining normal floret structure”
t0“rice”
Claim · model-written summary
The aim1-2 rice mutant showed impaired post-anthesis glume closure.
- Taxon
- riceOryza sativat0
- Material
- aim1-2 mutante0
- Outcome
- PAGCe0
- Direction
- impairede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The aim1-2 mutant exhibits delayed DFOT and impaired PAGC while maintaining normal floret structure”
t0“rice”
Claim · model-written summary
The aim1-2 rice mutant maintained normal floret structure.
- Taxon
- riceOryza sativat0
- Material
- aim1-2 mutante0
- Outcome
- normal floret structuree0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The aim1-2 mutant exhibits delayed DFOT and impaired PAGC while maintaining normal floret structure”
t0“rice”
Claim · model-written summary
OsAIM1 was highly expressed in lodicules.
- Taxon
- riceOryza sativat0
- Organ / stage
- lodiculese0
- Gene
- OsAIM1e0
- Outcome
- highly expressede0
- Direction
- highlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsAIM1 is highly expressed in lodicules”
t0“rice”
Claim · model-written summary
OsAIM1 encodes a peroxisome-localized multifunctional protein.
- Taxon
- riceOryza sativat0
- Gene
- OsAIM1t0
- Outcome
- peroxisome-localized multifunctional proteine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“encodes a peroxisome-localized multifunctional protein”
t0“The multifunctional protein OsAIM1 regulates floret opening and closure timing via jasmonic acid-mediated lodicule dynamics in rice”
Claim · model-written summary
OsAIM1 regulates lodicule swelling during floret opening.
- Taxon
- riceOryza sativat0
- Organ / stage
- lodiculee0
- Gene
- OsAIM1e0
- Outcome
- lodicule swelling during floret openinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsAIM1 regulates lodicule swelling during floret opening and withering post-anthesis”
t0“rice”
Claim · model-written summary
OsAIM1 regulates lodicule withering after anthesis.
- Taxon
- riceOryza sativat0
- Organ / stage
- lodiculee0
- Gene
- OsAIM1e0
- Outcome
- withering post-anthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsAIM1 regulates lodicule swelling during floret opening and withering post-anthesis”
t0“rice”
Claim · model-written summary
OsAIM1-dependent jasmonic acid biosynthesis coordinates floret opening.
- Taxon
- riceOryza sativat0
- Gene
- OsAIM1e0
- Compound
- jasmonic acide0
- Outcome
- floret openinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsAIM1-dependent jasmonic acid biosynthesis is indispensable for coordinating floret opening and closure”
t0“rice”
Claim · model-written summary
OsAIM1-dependent jasmonic acid biosynthesis coordinates floret closure.
- Taxon
- riceOryza sativat0
- Gene
- OsAIM1e0
- Compound
- jasmonic acide0
- Outcome
- closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsAIM1-dependent jasmonic acid biosynthesis is indispensable for coordinating floret opening and closure”
t0“rice”
Claim · model-written summary
OsAIM1-dependent jasmonic acid biosynthesis influences sugar transport.
- Taxon
- riceOryza sativat0
- Gene
- OsAIM1e0
- Compound
- jasmonic acide0
- Outcome
- sugar transporte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsAIM1-dependent jasmonic acid biosynthesis is indispensable for coordinating floret opening and closure and influences sugar transport to ensure proper lodicule dynamics”
t0“rice”
Claim · model-written summary
Natural OsAIM1 coding-region variation contributes to opening-time divergence between japonica and indica.
- Taxon
- riceOryza sativat0
- Material
- japonica and indica subspeciese0
- Gene
- OsAIM1e0
- Outcome
- DFOT divergencee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“natural variation in the OsAIM1 coding region contributes to DFOT divergence between japonica and indica subspecies”
t0“rice”