Abstract
The mechanisms for plant growth restriction during stress conditions remains unclear. Here, we demonstrate that a phytochrome-interacting factor-like protein, OsPIL1/OsPIL13, acts as a key regulator of reduced internode elongation in rice under drought conditions. The level of OsPIL1 mRNA in rice seedlings grown under nonstressed conditions with light/dark cycles oscillated in a circadian manner with peaks in the middle of the light period. Under drought stress conditions, OsPIL1 expression was inhibited during the light period. We found that OsPIL1 was highly expressed in the node portions of the stem using promoter-glucuronidase analysis. Overexpression of OsPIL1 in transgenic rice plants promoted internode elongation. In contrast, transgenic rice plants with a chimeric repressor resulted in short internode sections. Alteration of internode cell size was observed in OsPIL1 transgenic plants, indicating that differences in cell size cause the change in internode length. Oligoarray analysis revealed OsPIL1 downstream genes, which were enriched for cell wall-related genes responsible for cell elongation. These data suggest that OsPIL1 functions as a key regulatory factor of reduced plant height via cell wall-related genes in response to drought stress. This regulatory system may be important for morphological stress adaptation in rice under drought conditions.
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Claims 8
Claim · model-written summary
OsPIL1 mRNA oscillated with a middle-of-light-period peak in unstressed rice seedlings.
- Taxon
- rice
Oryza sativae0 - Gene
- OsPIL1e0
- Outcome
- OsPIL1 mRNAe0
- Qualifier
- peaks in the middle of the light periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The level of OsPIL1 mRNA in rice seedlings grown under nonstressed conditions with light/dark cycles oscillated in a circadian manner with peaks in the middle of the light period.”
Claim · model-written summary
Drought inhibited OsPIL1 expression during the light period.
Not reportedTaxonComparator
Verbatim
e0“Under drought stress conditions, OsPIL1 expression was inhibited during the light period.”
Claim · model-written summary
OsPIL1 was highly expressed in stem nodes.
Not reportedTaxon
Verbatim
e0“OsPIL1 was highly expressed in the node portions of the stem using promoter-glucuronidase analysis.”
Claim · model-written summary
OsPIL1 overexpression promoted internode elongation.
- Taxon
- riceOryza sativae0
- Treatment
- Overexpression of OsPIL1e0
- Gene
- OsPIL1e0
- Outcome
- internode elongatione0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Overexpression of OsPIL1 in transgenic rice plants promoted internode elongation.”
Claim · model-written summary
A chimeric repressor produced short internode sections in transgenic rice.
- Taxon
- riceOryza sativae0
- Treatment
- a chimeric repressore0
- Outcome
- short internode sectionse0
- Direction
- shorte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transgenic rice plants with a chimeric repressor resulted in short internode sections.”
Claim · model-written summary
OsPIL1 transgenic plants showed altered internode cell size.
Not reportedTaxon
Verbatim
e0“Alteration of internode cell size was observed in OsPIL1 transgenic plants”
Claim · model-written summary
Oligoarray analysis identified OsPIL1 downstream genes enriched for cell-wall-related functions.
Not reportedTaxonComparatorValue
Verbatim
e0“Oligoarray analysis revealed OsPIL1 downstream genes, which were enriched for cell wall-related genes responsible for cell elongation.”
Claim · model-written summary
The authors infer that OsPIL1 regulates drought-related plant height through cell-wall-related genes.
- Gene
- OsPIL1e0
- Outcome
- reduced plant heighte0
- Qualifier
- via cell wall-related genes in response to drought stresse0
Not reportedTaxon
Verbatim
e0“OsPIL1 functions as a key regulatory factor of reduced plant height via cell wall-related genes in response to drought stress.”
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