Abstract
A short exposure to light in the middle of the night causes inhibition of flowering in short-day plants. This phenomenon is called night break (NB) and has been used extensively as a tool to study the photoperiodic control of flowering for many years. However, at the molecular level, very little is known about this phenomenon. In rice (Oryza sativa), 10 min of light exposure in the middle of a 14-h night caused a clear delay in flowering. A single NB strongly suppressed the mRNA of Hd3a, a homolog of Arabidopsis thaliana FLOWERING LOCUS T (FT), whereas the mRNAs of OsGI and Hd1 were not affected. The NB effect on Hd3a mRNA was maximal in the middle of the 14-h night. The phyB mutation abolished the NB effect on flowering and Hd3a mRNA, indicating that the NB effect was mediated by phytochrome B. Because expression of the other FT-like genes was very low and not appreciably affected by NB, our results strongly suggest that the suppression of Hd3a mRNA is the principal cause of the NB effect on flowering in rice.
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Claims 8
Claim · model-written summary
Ten minutes of light in the middle of a 14-hour night delayed rice flowering.
- Taxon
- rice
Oryza sativae0 - Treatment
- 10 min of light exposure in the middle of a 14-h nighte0
- Outcome
- floweringe0
- Direction
- delaye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice (Oryza sativa), 10 min of light exposure in the middle of a 14-h night caused a clear delay in flowering.”
Claim · model-written summary
A single night break strongly suppressed Hd3a mRNA.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single NB strongly suppressed the mRNA of Hd3a, a homolog of Arabidopsis thaliana FLOWERING LOCUS T (FT)”
e1“In rice (Oryza sativa)”
Claim · model-written summary
A single night break did not affect OsGI or Hd1 mRNA.
- Taxon
- riceOryza sativae2
- Treatment
- A single NBe1
- Gene
- OsGI and Hd1e0
- Outcome
- mRNAs of OsGI and Hd1e0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas the mRNAs of OsGI and Hd1 were not affected.”
e1“A single NB strongly suppressed the mRNA of Hd3a”
e2“In rice (Oryza sativa)”
Claim · model-written summary
The night-break effect on Hd3a mRNA was maximal midway through the night.
- Taxon
- riceOryza sativae1
- Gene
- Hd3ae0
- Outcome
- NB effect on Hd3a mRNAe0
- Direction
- maximale0
- Qualifier
- in the middle of the 14-h nighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NB effect on Hd3a mRNA was maximal in the middle of the 14-h night.”
e1“In rice (Oryza sativa)”
Claim · model-written summary
The phyB mutation abolished the night-break effect on flowering.
- Taxon
- riceOryza sativae1
- Treatment
- phyB mutatione0
- Gene
- phyBe0
- Outcome
- NB effect on floweringe0
- Direction
- abolishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phyB mutation abolished the NB effect on flowering and Hd3a mRNA”
e1“In rice (Oryza sativa)”
Claim · model-written summary
The phyB mutation abolished the night-break effect on Hd3a mRNA.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phyB mutation abolished the NB effect on flowering and Hd3a mRNA”
e1“In rice (Oryza sativa)”
Claim · model-written summary
Other FT-like genes had very low expression and were not appreciably affected by night break.
- Taxon
- riceOryza sativae1
- Gene
- FT-like genese0
- Outcome
- expression of the other FT-like genese0
- Direction
- not appreciably affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“expression of the other FT-like genes was very low and not appreciably affected by NB”
e1“In rice (Oryza sativa)”
Claim · model-written summary
The authors infer that Hd3a mRNA suppression is the principal cause of the night-break flowering effect in rice.
- Taxon
- riceOryza sativae0
- Gene
- Hd3ae0
- Outcome
- NB effect on floweringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“our results strongly suggest that the suppression of Hd3a mRNA is the principal cause of the NB effect on flowering in rice.”
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See all 24 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.