Abstract
Sunflowers, Helianthus annuus `Contiflor' and `P75,' were grown in pots under natural daylight in glass-house and field experiments to examine the responses of extension growth and orientation of leaves to end-of-day irradiations with different red/far-red (R/FR) ratios. For individual leaves the effect on expansion was biphasic. High R/FR ratios enhanced growth in young leaves but inhibited growth as leaves became older. No differences were found for growth duration or phyllochron index. The pattern of response was similar in both cultivars. The upper leaves tracked the sun, but, in `Contiflor' at low solar elevations, solar tracking was more nearly accurate for leaves of high R/FR-irradiated plants. Conversely, the laminar angle of `P75' was unaffected by the light treatments. A similar pattern of laminar angle response occurred for plants of different ages.
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Claims 8
Claim · model-written summary
High red/far-red ratios enhanced growth in young sunflower leaves.
- Taxon
- Sunflower
Helianthus annuust0 - Organ / stage
- young leavese0
- Treatment
- High R/FR ratiose0
- Outcome
- growthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High R/FR ratios enhanced growth in young leaves but inhibited growth as leaves became older.”
t0“Sunflower Leaves”
Claim · model-written summary
High red/far-red ratios inhibited growth in older sunflower leaves.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- leaves became oldere0
- Treatment
- High R/FR ratiose0
- Outcome
- growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High R/FR ratios enhanced growth in young leaves but inhibited growth as leaves became older.”
t0“Sunflower Leaves”
Claim · model-written summary
Growth duration and phyllochron index did not differ among light treatments.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- end-of-day irradiations with different red/far-red (R/FR) ratiose1
- Outcome
- growth duration or phyllochron indexe0
- Direction
- No differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences were found for growth duration or phyllochron index.”
t0“Sunflower Leaves”
e1“end-of-day irradiations with different red/far-red (R/FR) ratios”
Claim · model-written summary
Leaf expansion responses were similar in both cultivars.
- Taxon
- SunflowerHelianthus annuust0
- Material
- both cultivarse0
- Outcome
- pattern of responsee0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pattern of response was similar in both cultivars.”
t0“Sunflower Leaves”
Claim · model-written summary
Upper sunflower leaves tracked the sun.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- upper leavese0
- Outcome
- tracked the sune0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The upper leaves tracked the sun, but, in `Contiflor' at low solar elevations, solar tracking was more nearly accurate for leaves of high R/FR-irradiated plants.”
t0“Sunflower Leaves”
Claim · model-written summary
At low solar elevations, high R/FR made Contiflor solar tracking more accurate.
- Taxon
- SunflowerHelianthus annuust0
- Material
- `Contiflor'e0
- Treatment
- high R/FR-irradiatede0
- Outcome
- solar trackinge0
- Direction
- more nearly accuratee0
- Qualifier
- low solar elevationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in `Contiflor' at low solar elevations, solar tracking was more nearly accurate for leaves of high R/FR-irradiated plants.”
t0“Sunflower Leaves”
Claim · model-written summary
P75 laminar angle was unaffected by light treatments.
- Taxon
- SunflowerHelianthus annuust0
- Material
- `P75'e0
- Treatment
- light treatmentse0
- Outcome
- laminar anglee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the laminar angle of `P75' was unaffected by the light treatments.”
t0“Sunflower Leaves”
Claim · model-written summary
Laminar angle responses were similar across plant ages.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- plants of different agese0
- Outcome
- laminar angle responsee0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A similar pattern of laminar angle response occurred for plants of different ages.”
t0“Sunflower Leaves”
The same questions in other papers
radiation · growth · Helianthus annuus (common sunflower)Positive and negative results
10 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
15 papers more in this group
See all 19 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.