Abstract
Continuous recordings of the effect of red light on the over‐all and zonal growth responses were made on intact, dark‐grown wheat ( Triticum aestivum L., cv. Hatri) seedlings selected 70 or 90 h after sowing. The over‐all growth response of intact coleoptiles induced by bilateral continuous red light (660 nm, 17 W m −2 ) was complex and resulted from the overlapping of different zonal growth responses. During a 5 h investigation period, these responses can be divided into two phases. The first phase (short‐term response) was a transient growth inhibition. After a lag period of ca 15 min, the rate of extension decelerated to a minimum value at ca 60 min, after which an acceleration was seen. This response was qualitatively the same in all coleoptile zones investigated (tip, subapical zone, base) and independent of coleoptile age. The second phase (delayed response) became measurable between 1.8 and 3 h after onset of red light irradiation and exhibited zonal‐specific growth promotion or inhibition, dependent on the coleoptile age. A persistent growth promotion was observed only in the tip region of coleoptiles selected 70 h after sowing and became detectable about 3 h after the onset of red light.
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Claims 7
Claim · model-written summary
The complex overall wheat coleoptile growth response to bilateral continuous red light resulted from overlapping zonal responses.
- Taxon
- wheat
Triticum aestivumt0 - Organ / stage
- intact coleoptilese0
- Treatment
- bilateral continuous red light (660 nm, 17 W m −2 )e0
- Outcome
- over‐all growth responsee0
- Qualifier
- overlapping of different zonal growth responsese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The over‐all growth response of intact coleoptiles induced by bilateral continuous red light (660 nm, 17 W m −2 ) was complex and resulted from the overlapping of different zonal growth responses.”
t0“wheat”
Claim · model-written summary
Red light initially caused transient growth inhibition in wheat coleoptiles.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- intact coleoptilese1
- Treatment
- bilateral continuous red light (660 nm, 17 W m −2 )e1
- Outcome
- growthe0
- Direction
- inhibitione0
- Qualifier
- transiente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The first phase (short‐term response) was a transient growth inhibition.”
t0“wheat”
e1“The over‐all growth response of intact coleoptiles induced by bilateral continuous red light (660 nm, 17 W m −2 ) was complex and resulted from the overlapping of different zonal growth responses.”
Claim · model-written summary
After a roughly 15-minute lag, wheat coleoptile extension decelerated to a minimum around 60 minutes under red light.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- intact coleoptilese1
- Treatment
- bilateral continuous red light (660 nm, 17 W m −2 )e1
- Outcome
- rate of extensione0
- Direction
- deceleratede0
- Value
- ca 60 mine0
- Qualifier
- After a lag period of ca 15 mine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After a lag period of ca 15 min, the rate of extension decelerated to a minimum value at ca 60 min, after which an acceleration was seen.”
t0“wheat”
e1“The over‐all growth response of intact coleoptiles induced by bilateral continuous red light (660 nm, 17 W m −2 ) was complex and resulted from the overlapping of different zonal growth responses.”
Claim · model-written summary
Wheat coleoptile extension accelerated after the minimum at approximately 60 minutes.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- intact coleoptilese1
- Treatment
- bilateral continuous red light (660 nm, 17 W m −2 )e1
- Outcome
- rate of extensione0
- Direction
- acceleratione0
- Qualifier
- at ca 60 min, after which an acceleration was seene0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After a lag period of ca 15 min, the rate of extension decelerated to a minimum value at ca 60 min, after which an acceleration was seen.”
t0“wheat”
e1“The over‐all growth response of intact coleoptiles induced by bilateral continuous red light (660 nm, 17 W m −2 ) was complex and resulted from the overlapping of different zonal growth responses.”
Claim · model-written summary
The short-term response was qualitatively the same in the wheat coleoptile tip, subapical zone and base and was independent of age.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- tip, subapical zone, basee0
- Outcome
- qualitatively the samee0
- Qualifier
- independent of coleoptile agee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This response was qualitatively the same in all coleoptile zones investigated (tip, subapical zone, base) and independent of coleoptile age.”
t0“wheat”
Claim · model-written summary
The delayed red-light response became measurable after 1.8–3 hours and showed age-dependent, zone-specific growth promotion or inhibition in wheat coleoptiles.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- coleoptilee0
- Treatment
- red light irradiatione0
- Outcome
- growthe0
- Direction
- promotion or inhibitione0
- Value
- between 1.8 and 3 he0
- Qualifier
- dependent on the coleoptile agee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The second phase (delayed response) became measurable between 1.8 and 3 h after onset of red light irradiation and exhibited zonal‐specific growth promotion or inhibition, dependent on the coleoptile age.”
t0“wheat”
Claim · model-written summary
Persistent growth promotion occurred only in tips of wheat coleoptiles selected 70 hours after sowing and was detectable about three hours after red-light onset.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- tip region of coleoptilese0
- Treatment
- red lighte0
- Outcome
- growthe0
- Direction
- promotione0
- Value
- about 3 he0
- Qualifier
- selected 70 h after sowinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A persistent growth promotion was observed only in the tip region of coleoptiles selected 70 h after sowing and became detectable about 3 h after the onset of red light.”
t0“wheat”
The same questions in other papers
light · growth · Triticum aestivum (wheat)Positive and negative results
45 papers in the same direction as this paper · 36 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- no effect
- negative
81 papers more in this group
See all 85 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.