Abstract
A short exposure to light during relative night (night break; NB) delays flowering in the short day plant rice. NB acts by downregulating Heading date 3a (Hd3a) expression. Because phytochrome B mutants do not respond to NB and their flowering time is not affected even under NB conditions, phyB is required for the suppression of Hd3a expression. The effect of NB is quantitatively controlled by light quality and by either light intensity or duration. However, the molecular mechanisms that regulate these interactions are poorly understood. Here, we examine the roles of phytochromes in the regulation of Hd3a transcription under NB conditions using monochromatic red, far-red and blue light. Red and blue light downregulated Hd3a expression, but far-red light NB did not. The effect of red light NB on Hd3a is dependent on photon fluence and is restored by subsequent far-red light irradiation. Our results suggest that quantitative effect of light on flowering in rice NB is mediated by the regulation of Hd3a transcription by phyB.
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Claims 12
Claim · model-written summary
A night break delayed rice flowering.
- Taxon
- rice
Oryza sativae0 - Treatment
- short exposure to light during relative nighte0
- Outcome
- floweringe0
- Direction
- delayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A short exposure to light during relative night (night break; NB) delays flowering in the short day plant rice”
Claim · model-written summary
A night break downregulated Hd3a expression in rice.
- Taxon
- riceOryza sativat0
- Treatment
- NBe0
- Gene
- Heading date 3a (Hd3a)e0
- Outcome
- Heading date 3a (Hd3a) expressione0
- Direction
- downregulatinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NB acts by downregulating Heading date 3a (Hd3a) expression”
t0“rice flowering”
Claim · model-written summary
Phytochrome B mutants did not respond to night break in rice.
- Taxon
- riceOryza sativat0
- Material
- phytochrome B mutantse0
- Gene
- phytochrome Be0
- Outcome
- do not respond to NBe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytochrome B mutants do not respond to NB”
t0“rice flowering”
Claim · model-written summary
Night break did not affect flowering time in rice phytochrome B mutants.
- Taxon
- riceOryza sativat0
- Material
- phytochrome B mutantse1
- Treatment
- NB conditionse0
- Outcome
- flowering timee0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their flowering time is not affected even under NB conditions”
e1“phytochrome B mutants”
t0“rice flowering”
Claim · model-written summary
Night-break effects on rice were quantitatively controlled by light quality.
- Taxon
- riceOryza sativat0
- Treatment
- light qualitye0
- Outcome
- effect of NBe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of NB is quantitatively controlled by light quality”
t0“rice flowering”
Claim · model-written summary
Night-break effects on rice were quantitatively controlled by light intensity or duration.
- Taxon
- riceOryza sativat0
- Treatment
- light intensity or duratione0
- Outcome
- effect of NBe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of NB is quantitatively controlled by light quality and by either light intensity or duration”
t0“rice flowering”
Claim · model-written summary
Red light downregulated rice Hd3a expression.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red and blue light downregulated Hd3a expression”
t0“rice flowering”
Claim · model-written summary
Blue light downregulated rice Hd3a expression.
- Taxon
- riceOryza sativat0
- Treatment
- blue lighte0
- Gene
- Hd3ae0
- Outcome
- Hd3a expressione0
- Direction
- downregulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red and blue light downregulated Hd3a expression”
t0“rice flowering”
Claim · model-written summary
Far-red light night break did not downregulate rice Hd3a expression.
- Taxon
- riceOryza sativat0
- Treatment
- far-red light NBe0
- Gene
- Hd3ae1
- Outcome
- Hd3a expressione1
- Direction
- did note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“far-red light NB did not”
e1“Red and blue light downregulated Hd3a expression, but far-red light NB did not”
t0“rice flowering”
Claim · model-written summary
The red-light night-break effect on rice Hd3a depended on photon fluence.
- Taxon
- riceOryza sativat0
- Treatment
- photon fluencee0
- Gene
- Hd3ae0
- Outcome
- effect of red light NB on Hd3ae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of red light NB on Hd3a is dependent on photon fluence”
t0“rice flowering”
Claim · model-written summary
Subsequent far-red irradiation restored the red-light night-break effect on rice Hd3a.
- Taxon
- riceOryza sativat0
- Treatment
- subsequent far-red light irradiatione0
- Gene
- Hd3ae0
- Outcome
- effect of red light NB on Hd3ae0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of red light NB on Hd3a is dependent on photon fluence and is restored by subsequent far-red light irradiation”
t0“rice flowering”
Claim · model-written summary
The authors suggest phyB regulation of Hd3a transcription mediates the quantitative night-break effect on rice flowering.
- Taxon
- riceOryza sativae0
- Gene
- Hd3ae0
- Outcome
- quantitative effect of light on floweringe0
- Qualifier
- regulation of Hd3a transcription by phyBe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quantitative effect of light on flowering in rice NB is mediated by the regulation of Hd3a transcription by phyB”
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radiation · phenology · Oryza sativa (rice)Positive and negative results
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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.