Abstract
Seeds of the wild type (WT) and of the phyA and phyB mutants of Arabidopsis thaliana were exposed to single red light (R)/far-red light (FR) pulses predicted to establish a series of calculated phytochrome photoequilibria (Pfr/P). WT and phyB seeds showed biphasic responses to Pfr/P. The first phase, i.e. the very-low-fluence response (VLFR), occurred below Pfr/P = 10-1%. The second phase, i.e. the low-fluence response, occurred above Pfr/P = 3%. The VLFR was similarly induced by either a FR pulse saturating photoconversion or a subsaturating R pulse predicted to establish the same Pfr/P. The VLFR was absent in phyA seeds, which showed a strong low-fluence response. In the field, even brief exposures to the very low fluences of canopy shade light (R/FR ratio < 0.05) promoted germination above dark controls in WT and phyB seeds but not in the phyA mutant. Seeds of the phyA mutant germinated normally under canopies providing higher R/FR ratios or under deep canopy shade light supplemented with R from light-emitting diodes. We propose that phytochrome A mediates VLFR of A. thaliana seeds.
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Claims 11
Claim · model-written summary
Wild-type and phyB seeds had biphasic Pfr/P germination responses.
- Taxon
- Arabidopsis
Arabidopsist0 - Material
- phyBe0
- Outcome
- biphasic responses to Pfr/Pe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WT and phyB seeds showed biphasic responses to Pfr/P”
t0“Arabidopsis”
Claim · model-written summary
The very-low-fluence response occurred below Pfr/P = 10-1%.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- very-low-fluence response (VLFR)e0
- Value
- Pfr/P = 10-1%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The first phase, i.e. the very-low-fluence response (VLFR), occurred below Pfr/P = 10-1%”
t0“Arabidopsis”
Claim · model-written summary
The low-fluence response occurred above Pfr/P = 3%.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- low-fluence responsee0
- Value
- Pfr/P = 3%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second phase, i.e. the low-fluence response, occurred above Pfr/P = 3%”
t0“Arabidopsis”
Claim · model-written summary
A far-red pulse and a subsaturating red pulse at the same predicted Pfr/P induced similar VLFR.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- FR pulse saturating photoconversione0
- Outcome
- VLFRe0
- Direction
- similarly inducede0
- Comparator
- subsaturating R pulsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The VLFR was similarly induced by either a FR pulse saturating photoconversion or a subsaturating R pulse predicted to establish the same Pfr/P”
t0“Arabidopsis”
Claim · model-written summary
The VLFR was absent in phyA seeds.
- Taxon
- ArabidopsisArabidopsist0
- Material
- phyAe0
- Outcome
- VLFRe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The VLFR was absent in phyA seeds, which showed a strong low-fluence response”
t0“Arabidopsis”
Claim · model-written summary
phyA seeds had a strong low-fluence response.
- Taxon
- ArabidopsisArabidopsist0
- Material
- phyAe0
- Outcome
- strong low-fluence responsee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phyA seeds, which showed a strong low-fluence response”
t0“Arabidopsis”
Claim · model-written summary
Brief low-fluence canopy shade promoted field germination in WT and phyB above dark controls.
- Taxon
- ArabidopsisArabidopsist0
- Material
- WT and phyBe0
- Treatment
- canopy shade light (R/FR ratio < 0.05)e0
- Outcome
- germinatione0
- Direction
- promotede0
- Comparator
- dark controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“brief exposures to the very low fluences of canopy shade light (R/FR ratio < 0.05) promoted germination above dark controls in WT and phyB seeds but not in the phyA mutant”
t0“Arabidopsis”
Claim · model-written summary
The same canopy shade light did not promote germination in phyA seeds.
- Taxon
- ArabidopsisArabidopsist0
- Material
- phyA mutante0
- Treatment
- canopy shade light (R/FR ratio < 0.05)e0
- Outcome
- germinatione0
- Direction
- no_changeinferrede0
- Comparator
- dark controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“brief exposures to the very low fluences of canopy shade light (R/FR ratio < 0.05) promoted germination above dark controls in WT and phyB seeds but not in the phyA mutant”
t0“Arabidopsis”
Claim · model-written summary
phyA seeds germinated normally under canopies with higher R/FR ratios.
- Taxon
- ArabidopsisArabidopsist0
- Material
- phyA mutante0
- Outcome
- germinated normallye0
- Setting
- canopies providing higher R/FR ratiose0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of the phyA mutant germinated normally under canopies providing higher R/FR ratios”
t0“Arabidopsis”
Claim · model-written summary
phyA seeds germinated normally under deep shade supplemented with red LED light.
- Taxon
- ArabidopsisArabidopsist0
- Material
- phyA mutante0
- Treatment
- deep canopy shade light supplemented with R from light-emitting diodese0
- Outcome
- germinated normallye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds of the phyA mutant germinated normally under canopies providing higher R/FR ratios or under deep canopy shade light supplemented with R from light-emitting diodes”
t0“Arabidopsis”
Claim · model-written summary
The authors propose phytochrome A mediates the VLFR of Arabidopsis seeds.
- Taxon
- A. thalianaArabidopsis thalianae0
- Gene
- phytochrome Ae0
- Outcome
- VLFRe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phytochrome A mediates VLFR of A. thaliana seeds”
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light · growth · ArabidopsisResults differ
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See all 5 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.